UNITED STATES SECURITIES AND EXCHANGE
COMMISSION

WASHINGTON, D.C. 20549



FORM 20-F



(Mark One)



| ̈ |  | REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 | 
|- |  | ------------------------------------------------------------------------------------------------ | 
|  |  |                                                                                                  | 
|  |  | OR                                                                                               | 
|  |  |                                                                                                  | 
|x |  | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934             | 
|  |  | For the fiscal year ended December 31, 2012                                                      | 
|  |  |                                                                                                  | 
|  |  | OR                                                                                               | 
|  |  |                                                                                                  | 
| ̈ |  | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934         | 
|  |  | For the transition period from _____________ to _____________                                    | 
|  |  |                                                                                                  | 
|  |  | OR                                                                                               | 
|  |  |                                                                                                  | 
| ̈ |  | SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934      | 
|  |  | Date of event requiring this shell company report __________________                             | 



Commission File Number: 000-29336



ATNA RESOURCES LTD.

(Exact name of registrant as specified in
its charter)



Not applicable

(Translation of registrant’s name
into English)



Province of British Columbia (Canada)

(Jurisdiction of incorporation or organization)



14142 Denver West Parkway, Suite 250

Golden, Colorado 80401

United States

(Address of principal executive offices)



Rod Gloss

Vice President and Chief Financial Officer

14142 Denver West Parkway, Suite 250

Golden, Colorado 80401

United States

Telephone: (303) 278-8464

Fax: (303) 279-3772

(Name, Telephone, E-mail and/or Facsimile
number and Address of Company Contact Person)













Securities registered or to be
registered pursuant to Section 12(b) of the Act:

None



Securities
registered or to be registered pursuant to Section 12(g) of the Act:

Common Shares Without Par Value

(Title of Class)



Securities for which there is
a reporting obligation pursuant to Section 15(d) of the Act:

None



Indicate the number of outstanding
shares of each of the issuer's classes of capital or common stock as of the close of the period covered by the annual report:



|Title of Each Class                | Issued and Outstanding as at December 31, 2012
|---------------------------------- | ----------------------------------------------
|                                   |                                               
|Common Shares without par value    | 144,989,922                                   
|Preferred Shares without par value | Nil                                           



Indicate by check mark if the
registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.

 ̈Yes x No



If this report is an annual or
transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of
the Securities Exchange Act of 1934.

 ̈
Yes x No



Indicate by check mark whether
the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject
to such filing requirements for the past 90 days.

x
Yes  ̈ No



Indicate by check mark whether
the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required
to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months
(or for such shorter period that the registrant was required to submit and post such files).

 ̈
Yes  ̈ No



Indicate by check mark whether
the registrant is a large accelerated filer, an accelerated filer or a non-accelerated filer. See definition of “accelerated
filer and large accelerated filer” in Rule 12b-2 of the Exchange Act.:

 ̈
Large accelerated filer  ̈ Accelerated filer x
Non-accelerated filer



Indicate by check mark which basis
of accounting the registrant has used to prepare the financial statements included in this filing:

| ̈ U.S. GAAP | x International Financial Reporting Standards as issued by the International Accounting Standards Board |  ̈Other
|----------- | ------------------------------------------------------------------------------------------------------- | ------



If “Other” has been
checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected
to follow:

 ̈
Item 17  ̈ Item 18



If this is an annual report, indicate
by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act):

 ̈
Yes x No











TABLE OF CONTENTS



|PART I    |                                                                              | 8 
|--------- | ---------------------------------------------------------------------------- | --
|          |                                                                              |   
|ITEM 1.   | IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS                        | 8 
|          |                                                                              |   
|ITEM 2.   | OFFER STATISTICS AND EXPECTED TIMETABLE                                      | 9 
|          |                                                                              |   
|ITEM 3.   | KEY INFORMATION                                                              | 9 
|          |                                                                              |   
|ITEM 4.   | INFORMATION ON THE COMPANY                                                   | 16
|          |                                                                              |   
|ITEM 4A.  | UNRESOLVED STAFF COMMENTS                                                    | 51
|          |                                                                              |   
|ITEM 5.   | OPERATING AND FINANCIAL REVIEW AND PROSPECTS                                 | 51
|          |                                                                              |   
|ITEM 6.   | DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES                                   | 62
|          |                                                                              |   
|ITEM 7.   | MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS                            | 76
|          |                                                                              |   
|ITEM 8.   | FINANCIAL INFORMATION                                                        | 77
|          |                                                                              |   
|ITEM 9.   | THE OFFER AND LISTING                                                        | 79
|          |                                                                              |   
|ITEM 10.  | ADDITIONAL INFORMATION                                                       | 81
|          |                                                                              |   
|ITEM 11.  | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK                   | 91
|          |                                                                              |   
|ITEM 12.  | DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES                       | 95
|          |                                                                              |   
|PART II   |                                                                              | 96
|          |                                                                              |   
|ITEM 13.  | DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES                              | 96
|          |                                                                              |   
|ITEM 14.  | MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS AND USE OF PROCEEDS | 96
|          |                                                                              |   
|ITEM 15.  | CONTROLS AND PROCEDURES                                                      | 96
|          |                                                                              |   
|ITEM 16.  | RESERVED                                                                     | 97
|          |                                                                              |   
|ITEM 16A. | AUDIT COMMITTEE FINANCIAL EXPERT                                             | 97
|          |                                                                              |   
|ITEM 16B. | CODE OF ETHICS                                                               | 97
|          |                                                                              |   
|ITEM 16C. | PRINCIPAL ACCOUNTANT FEES AND SERVICES                                       | 98
|          |                                                                              |   
|ITEM 16D. | EXCEPTIONS FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES                   | 98
|          |                                                                              |   
|ITEM 16E. | PURCHASES OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED PERSONS          | 98
|          |                                                                              |   
|ITEM 16F. | CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT                                 | 98
|          |                                                                              |   
|ITEM 16G. | CORPORATE GOVERNANCE                                                         | 98
|          |                                                                              |   
|ITEM 16H. | MINE SAFETY DISCLOSURE                                                       | 99
|          |                                                                              |   
|PART III  |                                                                              | 99
|          |                                                                              |   
|ITEM 17.  | FINANCIAL STATEMENTS                                                         | 99
|          |                                                                              |   
|ITEM 18.  | FINANCIAL STATEMENTS                                                         | 99
|          |                                                                              |   
|ITEM 19.  | EXHIBITS                                                                     | 99



3







CAUTIONARY INFORMATION
ABOUT FORWARD-LOOKING STATEMENTS



This Annual Report and the documents incorporated
by reference herein contain “forward-looking statements” within the meaning of applicable securities legislation. These
“forward-looking statements” are based on projections, expectations and estimates as of the report date or, in the
case of documents incorporated by reference herein, as of the date of such documents. Forward-looking statements are provided for
the purpose of providing information about management’s expectations and plans related to the future. All of the forward-looking
statements made in this Annual Report are qualified by these cautionary statements.



Forward-looking statements may include,
but are not limited to, statements with respect to the future price of gold and silver, the estimation of mineral reserves and
resources, the realization of mineral reserve estimates, the timing and amount of estimated future production, anticipated costs
of production, estimated capital expenditures, estimated net present values, estimated internal rates of return, estimated development
activities, mine development plans, currency fluctuations, requirements for additional capital, government regulation of mining
operations, environmental risks or claims, the anticipated use of proceeds from financings, anticipated capital spending and liquidity,
the timing of commencement of commercial production, drilling schedules and potential results thereof, granting of permits and
approvals, and the timing and potential results of studies and reports. In certain cases, forward-looking statements can be identified
by the use of words such as “plans”, “is planned”, “expects” or “does not expect”,
“is expected”, “is designed”, “budget” or “budgeted”, “scheduled”,
“estimates”, “projects”, “forecasts”, “contemplates”, “continue”, “targets”,
“targeted”, “intends”, “anticipates” or “does not anticipate”, or “believes”,
or variations of such words and phrases or statements that certain actions, events or results “may”, “could”,
“would”, “might” or “will be taken”, “occur” or “be achieved”.



In particular, this Annual Report and other
documents incorporated by reference herein contain forward-looking statements pertaining to the following:

| | · | Any projections of earnings, revenues, synergies, costs and cost savings, cash flows, liquidity,
capital spending, and other financial items;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------

| | · | Any projections of production, recoveries, stripping ratios, conversions of resources to reserves,
operational efficiencies and inefficiencies, and other operating items;
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Any projections that new financing can be obtained upon commercially acceptable terms given market
and economic conditions at the time;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------

| | · | Any statement of the plans, strategies, objectives, and goals of management for future operations,
including the development of the Pinson-underground, Pinson open-pit, Reward, Cecil-R, and Columbia gold mining projects and initial
commercial production at the Pinson-underground mine;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Any statements regarding future economic conditions or performance;
| | - | -------------------------------------------------------------------

| | · | Any statements of belief or intent; and
| | - | ---------------------------------------

| | · | Any assumptions regarding the foregoing.
| | - | ----------------------------------------



The
actual results could differ materially from those anticipated in these forward-looking statements as a result of the risk factors
set forth below and in the sections of thE MD&A entitled “Financial Risk Management”, “Critical Accounting
Estimates” and “Risks and Uncertainties” and in the Company’s other filings with Canadian Securities Administrators
and the US Securities and Exchange Commission (“SEC”):

| | · | Fluctuations in gold and other metals prices;
| | - | ---------------------------------------------

| | · | Risks relating to the Company’s ability to generate material revenues or obtain adequate financing or its planned exploration
and development activities;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Actual results of current exploration activities;
| | - | -------------------------------------------------



4







| | · | Conclusions of economic evaluations;
| | - | ------------------------------------

| | · | Changes in project parameters as plans continue to be refined;
| | - | --------------------------------------------------------------

| | · | Possible variations in ore reserves, grade or recovery rates;
| | - | -------------------------------------------------------------

| | · | Failure of plant, equipment or processes to operate as anticipated;
| | - | -------------------------------------------------------------------

| | · | Risks related to fluctuations in the currency market;
| | - | -----------------------------------------------------

| | · | Risks related to the business being subject to environmental laws and regulations which may increase costs of doing business
and restrict the Company’s operations;
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Delays in obtaining government approvals or financing or in the completion of development or construction activities;
| | - | ---------------------------------------------------------------------------------------------------------------------

| | · | Risks related to hedging metal production and key operating inputs;
| | - | -------------------------------------------------------------------

| | · | Risks related to operating hazards;
| | - | -----------------------------------

| | · | Risks related to the exploration, permitting, development and mining of precious metals;
| | - | ----------------------------------------------------------------------------------------

| | · | Risks related to estimation of reserves and resources;
| | - | ------------------------------------------------------

| | · | Risks related to governmental regulation, including environmental regulation;
| | - | -----------------------------------------------------------------------------

| | · | Risks related to competition;
| | - | -----------------------------

| | · | Risks related to joint ventures;
| | - | --------------------------------

| | · | Uncertainty of capital costs, operating costs, production, metal recoveries and economic returns;
| | - | -------------------------------------------------------------------------------------------------

| | · | Risks related to the uncertainty of the title of assets;
| | - | --------------------------------------------------------

| | · | The need to attract and retain qualified management and technical personnel;
| | - | ----------------------------------------------------------------------------

| | · | Risks related to reclamation activities on properties; and
| | - | ----------------------------------------------------------

| | · | Other risks described in other documents incorporated by reference herein.
| | - | --------------------------------------------------------------------------



Forward-looking statements provide information
about management’s current expectations and plans relating to anticipated future events and are based on the Company’s
current beliefs and assumptions regarding, among other things:

| | · | Future gold and other metals prices;
| | - | ------------------------------------

| | · | The overall success of the Company’s ability to generate material revenues and to obtain
adequate financing for its planned exploration and development activities;
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Actual results of current exploration activities;
| | - | -------------------------------------------------

| | · | Conclusions of economic evaluations;
| | - | ------------------------------------

| | · | Changes in project parameters as plans continue to be refined;
| | - | --------------------------------------------------------------

| | · | Future variations in ore reserves, grade, or recovery rates;
| | - | ------------------------------------------------------------

| | · | Failure of plant, equipment or processes to operate as anticipated;
| | - | -------------------------------------------------------------------

| | · | Realization of benefits from all capital including deferred stripping costs incurred during development
and production;
| | - | -----------------------------------------------------------------------------------------------------------------------

| | · | The estimated fair value of share-based compensation;
| | - | -----------------------------------------------------

| | · | The estimated fair value of financial instruments and nonmonetary transactions;
| | - | -------------------------------------------------------------------------------

| | · | Future profitability affecting deferred tax assets and liabilities;
| | - | -------------------------------------------------------------------

| | · | The probable outcome of contingencies;
| | - | --------------------------------------

| | · | Fluctuations in the currency market;
| | - | ------------------------------------

| | · | The regulatory frame work governing environmental laws and regulations;
| | - | -----------------------------------------------------------------------

| | · | Possible delays in obtaining governmental approvals or financing or in the completion of development
or construction activities;
| | - | --------------------------------------------------------------------------------------------------------------------------------

| | · | Hedging metal production and key operating inputs;
| | - | --------------------------------------------------

| | · | Operating hazards;
| | - | ------------------

| | · | The exploration, permitting, development and mining of precious metals;
| | - | -----------------------------------------------------------------------

| | · | Estimation of reserves and resources;
| | - | -------------------------------------

| | · | Capital costs, operating costs, production, metal recoveries and economic returns; and
| | - | --------------------------------------------------------------------------------------

| | · | The Company’s ability to attract and retain qualified management and technical personnel.
| | - | -----------------------------------------------------------------------------------------



5







Statements relating to mineral reserves
and resources are deemed to be forward-looking statements, as they involve the implied assessment, based on certain estimates and
assumptions, that the mineral reserves and resources described exist in the quantities predicted or estimated and can be profitably
produced in the future. Estimated values of future net revenue do not represent fair market value. There is no certainty that it
will be commercially viable to produce any portion of the resources.



Although the Company has attempted to identify
important factors that could cause actual actions, events or results to differ materially from those described in forward-looking
statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. There
can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ
materially from those anticipated in such statements. The Company’s forward-looking statements are based on the beliefs,
expectations and opinions of management as of the date the statements are made, and the Company does not assume any obligation
to update any forward-looking statements if circumstances or management’s beliefs, expectations or opinions should change,
except as required by law. For reasons set forth above, readers should not place undue reliance on forward-looking statements.
Forward-looking statements are made as of the report date and other than as required by applicable securities laws, the Company
assumes no obligation to update or revise such forward-looking statements to reflect new events or circumstances.



CAUTIONARY NOTE TO U.S. INVESTORS CONCERNING
ESTIMATES OF MINERAL RESERVES AND MINERAL RESOURCES



We advise U.S. investors that the definitions
of the terms “mineral reserve,” “proven mineral reserve” and “probable mineral reserve” under
the Standards on Mineral Resources and Mineral Reserves Definitions and Guidelines adopted by the Canadian Institute of Mining,
Metallurgy and Petroleum are different than the definitions adopted by the SEC and applicable to U.S. companies filing reports
with the SEC pursuant to SEC Industry Guide 7. It is the view of the SEC’s staff that:

| | · | A “final” or “bankable”
feasibility study is required to meet the requirements to designate reserves under Industry Guide 7.
| | - | ----------------------------------------------------------------------------------------------------------------------------

| | · | A historic three-year average price is
to be used in any reserve or cash flow analysis to designate reserves.
| | - | -------------------------------------------------------------------------------------------------------------

| | · | To meet the “legal” part of
the reserve definition, the primary environmental analysis or document should have been submitted to governmental authorities.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------



Cautionary Note to U.S. Investors –
The SEC permits U.S. mining companies, in their filings with the SEC, to disclose only those mineral deposits that a company can
economically and legally extract or produce. We use certain terms in this report, such as “measured,” “indicated,”
and “inferred mineral resources” which the SEC guidelines generally prohibit U.S. registered companies from including
in their filings with the SEC. U.S. investors are urged to consider closely the disclosure in this Annual Report on Form 20-F.



GLOSSARY OF SELECTED MINING TERMS



Cut-off Grade: The minimum grade
of mineralized material used to establish reserves and resources.



Doré: Unrefined gold and
silver bullion consisting of approximately 90 percent precious metals that will be further refined to almost pure metal.



Feasibility Study: An engineering
study designed to define the technical, economic, and legal viability of a mining project with a high degree of reliability.



6







Grade: The metal content of sampled
material, usually expressed in troy ounces per ton or grams per tonne. In this report we consistently use ounces per ton to describe
our grades of reserves or mineralized material. (See “Ounces per Ton” or “Grams per Tonne” below).



Grams per Tonne (“g/t”):
Metric units used to describe the grade of sampled material, reserve or resource. It represents the portion of a gram estimated
to be contained in a metric ton of rock.



Heap Leaching: A method of recovering
gold or other precious metals from a heap of ore placed on an impervious pad, whereby a dilute leaching solution is allowed to
percolate through the heap, dissolving the precious metal, which is subsequently captured and recovered.



Net Smelter Return (“NSR”)
Royalty: A defined percentage of the gross revenue from a mineral extraction operation, less a proportionate share of transportation,
insurance, and processing costs.



Ounces per Ton (“oz/ton”):
English units used to describe the grade of ore or other material analyzed, reserve or resource. It represents the portion of an
ounce estimated to be contained in a ton of rock.



Patented Mining Claim: A patented
mining claim is one for which the federal government has passed its title to the claimant, making it private land. A person may
mine and remove minerals from a mining claim without a mineral patent. However, a mineral patent gives the owner exclusive title
to the locatable minerals. It also gives the owner title to the surface and other resources.



Reclamation: The process of returning
land to another use after mining is completed.



Recoverable: That portion of metal
contained in ore that can be extracted by processing.



Run-of-Mine: Mined ore of a size
that can be processed without further crushing.



Strip Ratio: The ratio between tonnage
of waste and ore in an open-pit mine.



Stope:An area developed in an underground
mine for the purpose of extracting ore.



Tons or Tonnes: Tons or short tons
contain 2,000 pounds and tonnes or metric tons contain 2,204.6 pounds or 1,000 kilograms.



Unpatented Mining Claim: A parcel
of property located on federal lands pursuant to the General Mining Law and the requirements of the state in which the unpatented
claim is located, the paramount title of which remains with the federal government. The holder of a valid, unpatented lode-mining
claim is granted certain rights including the right to explore and mine such claim under the General Mining Law.



Waste: Barren rock or mineralized
material that is too low in grade to be economically processed.



MINERAL RESERVE AND RESOURCE DISCLOSURE



Mineral
Reserves and Mineral Resources are defined under National Instrument 43-101 (“NI 43-101”) as follows. NI 43-101 technical
reports referenced herein can be viewed on SEDAR at www.sedar.com and on EDGAR at www.sec.gov/edgar.shtml.



7







Mineral Reserve:A Mineral Reserve is the economically
mineable part of a Measured or Indicated Mineral Resource demonstrated by at least a Preliminary Feasibility Study. This Study
must include adequate information on mining, processing, metallurgical, economic, and other relevant factors that demonstrate,
at the time of reporting, that economic extraction can be justified. A Mineral Reserve includes diluting materials and allowances
for losses that may occur when the material is mined.



Proven Mineral Reserve:A
‘Proven Mineral Reserve’ is the economically mineable part of a Measured Mineral Resource demonstrated by at least
a Preliminary Feasibility Study. This Study must include adequate information on mining, processing, metallurgical, economic, and
other relevant factors that demonstrate, at the time of reporting, that economic extraction is justified.



Probable Mineral Reserve:A
‘Probable Mineral Reserve’ is the economically mineable part of an Indicated and, in some circumstances, a Measured
Mineral Resource demonstrated by at least a Preliminary Feasibility Study. This Study must include adequate information on mining,
processing, metallurgical, economic, and other relevant factors that demonstrate, at the time of reporting, that economic extraction
can be justified.



Mineral Resource:A Mineral
Resource is a concentration or occurrence of diamonds, natural solid inorganic material, or natural solid fossilized organic material
including base and precious metals, coal, and industrial minerals in or on the Earth’s crust in such form and quantity and
of such a grade or quality that it has reasonable prospects for economic extraction. The location, quantity, grade, geological
characteristics and continuity of a Mineral Resource are known, estimated or interpreted from specific geological evidence and
knowledge.



Measured Mineral Resource:A
‘Measured Mineral Resource’ is that part of a Mineral Resourcefor which quantity, grade or quality, densities,
shape, and physical characteristics are so well established that they can be estimated with confidence sufficient to allow the
appropriate application of technical and economic parameters, to support production planning and evaluation of the economic viability
of the deposit. The estimate is based on detailed and reliable exploration, sampling and testing information gathered through appropriate
techniques from locations such as outcrops, trenches, pits, workings and drill holes that are spaced closely enough to confirm
both geological and grade continuity.



Indicated Mineral Resource:An
‘Indicated Mineral Resource’ is that part of a Mineral Resourcefor which quantity, grade or quality, densities,
shape and physical characteristics can be estimated with a level of confidence sufficient to allow the appropriate application
of technical and economic parameters and to support mine planning and evaluation of the economic viability of the deposit. The
estimate is based on detailed and reliable exploration and testing information gathered through appropriate techniques from locations
such as outcrops, trenches, pits, workings and drill holes that are spaced closely enough for geological and grade continuity to
be reasonably assumed.



Inferred Mineral Resource:An
‘Inferred Mineral Resource’ is that part of a Mineral Resourcefor which quantity and grade or quality
can be estimated on the basis of geological evidence and limited sampling and reasonably assumed, but not verified, geological
and grade continuity. The estimate is based on limited information and sampling gathered through appropriate techniques from locations
such as outcrops, trenches, pits, workings and drill holes.



PART I



| | ITEM | 1.       	IDENTITY OF DIRECTORS, SENIOR MANAGEMENT AND ADVISERS
| | ---- | ---------------------------------------------------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



8







| | ITEM | 2.        OFFER STATISTICS AND EXPECTED TIMETABLE
| | ---- | -------------------------------------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | ITEM | 3.       	KEY INFORMATION
| | ---- | -------------------------



| | A. | Selected Financial Data
| | -- | -----------------------



The following tables summarize certain
consolidated financial information of the Company. Excerpts from the audited consolidated financial statements for 2009 through
2012 have been prepared in accordance with International Financial Reporting Standards (“IFRS”). Excerpts from audited
consolidated financial statements for 2008 were prepared in accordance with Generally Accepted Accounting Practices (“GAAP”)
in Canada. A reconciliation of Canadian GAAP and U.S. GAAP for 2008 is presented below the table. The following information should
be read in conjunction with the consolidated financial statements and notes thereto, included in Item 18 of this report. Monetary
data not labeled herein is stated in United States Dollars (“U.S. Dollars” or “$”). Certain disclosures
are reported in Canadian Dollars (“Canadian Dollars” or “C$”). See Exchange Rates Data in this section.





|                                          |  | IFRS |             |  | Canadian GAAP |  
|----------------------------------------- |  | ---- | ----------- |  | ------------- | -
|Year ended                                |  | 2012 |             |  | 2011          |  
|Total revenues                            |  | $    | 59,763,300  |  |               | $
|Net income (loss)                         |  | $    | 6,886,000   |  |               | $
|Basic and diluted income (loss) per share |  | $    | 0.05        |  |               | $
|Working capital                           |  | $    | 6,429,000   |  |               | $
|Total assets                              |  | $    | 160,184,700 |  |               | $
|Total liabilities                         |  | $    | 42,816,200  |  |               | $
|Total shareholders' equity                |  | $    | 117,368,500 |  |               | $
|Number of shares issued and outstanding   |  |      | 144,989,922 |  |               |  



The reconciling items between Canadian
GAAP and U.S. GAAP for the year 2008 are: nil for total revenues, a $285,500 increase in net income to $16,090,500 under U.S. GAAP
due to the accounting treatment for warrants, nil for basic and diluted income per share, nil for working capital, nil for total
assets, an increase in total liabilities of $211,100 for warrants to $8,348,100, and a decrease in total shareholders’ equity
of $211,100 for warrants to $59,063,500.



Exchange Rate Data



Unless otherwise indicated, all monetary
references herein are denominated in U.S. Dollars. The exchange rates used herein were obtained from U. S. Federal Reserve Bank;
however, they cannot be guaranteed.



As of December 31, 2012 and March 20, 2013,
the noon rate as quoted by Bank of Canada was Canadian Dollar $1.005 and Canadian Dollar $0.9739 equals U.S. $1.00, respectively.



The following table sets out the U.S. Dollar
to Canadian Dollar high and low exchange rates for each month during the previous six months, expressed as U.S. Dollars per Canadian
Dollar.



9







|               |  | High for Period |  | Low for Period
|-------------- |  | --------------- |  | --------------
|February-2013  |  | 1.029           |  | 0.996         
|January-2013   |  | 1.008           |  | 0.984         
|December-2012  |  | 0.995           |  | 0.984         
|November-2012  |  | 1.003           |  | 0.993         
|October-2012   |  | 1.000           |  | 0.976         
|September-2012 |  | 0.990           |  | 0.971         



The following table sets forth the average
exchange rates for the past five years, expressed as U.S. Dollars per Canadian Dollar.



|Year |  | Average
|---- |  | -------
|2012 |  | 1.000  
|2011 |  | 0.989  
|2010 |  | 1.030  
|2009 |  | 1.142  
|2008 |  | 1.066  



| | B. | Capitalization and Indebtedness
| | -- | -------------------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | C. | Reasons for the Offer and Use of Proceeds
| | -- | -----------------------------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | D. | Risk Factors
| | -- | ------------



The securities of the Company are considered
speculative due to the nature of the Company’s business and the present stage of its development. A prospective investor
should consider carefully the following factors:



Risk Factors Relating to the Company



The Company was not a Passive
Foreign Investment Company, or PFIC, for the year ending December 31, 2012, although we may have been in prior years which could
result in adverse U.S. Tax Consequences to U.S. Investors.



Shareholders who are U.S. taxpayers should
be aware that Atna is not a passive foreign investment company (“PFIC”) for the current fiscal year, although it may
have been a PFIC in prior years and could also be a PFIC in subsequent years. If Atna is a PFIC for any year during a U.S. taxpayer’s
holding period, then such U.S. taxpayer generally will be required to treat any so-called “excess distribution” received
on its common shares, or any gain realized upon a disposition of common shares, as ordinary income and to pay an interest charge
on a portion of such distribution or gain, unless the taxpayer makes a timely and effective qualified electing fund (“QEF”)
election or a mark-to-market election with respect to the shares of Atna. In certain circumstances, the sum of the tax and the
interest charge may exceed the amount of the excess distribution received, or the amount of proceeds of disposition realized, by
the taxpayer. A U.S. taxpayer who makes a QEF election generally must report on a current basis its share of Atna’s net capital
gain and ordinary earnings for any year in which we are a PFIC, whether or not we distribute any amounts to our shareholders. A
U.S. taxpayer who makes the mark-to-market election, generally, must include as ordinary income in each year, the excess of the
fair market value of the common shares over the taxpayer’s tax basis therein. Refer to additional details under “E.
Taxation – U.S. Federal Income Tax Consequences” for more information.



10







Precious and Base Metal Price Fluctuations



The profitability of the Company’s
operations is dependent upon the market price of certain precious and base metals. The markets for gold and other metals are affected
by numerous factors, many of which are beyond our control. Such factors include the price of the metal in the marketplace, imports
of metals from other nations, demand for metals, the availability of adequate refining and milling facilities, and the market price
of competitive metals used in the same industrial applications. The market price of metals is extremely volatile and beyond our
control. Gold prices are generally influenced by basic supply/demand fundamentals, inflation, alternative investment markets, and
the strength or weakness of the U.S. Dollar. The market dynamics of supply/demand can be heavily influenced by economic policy;
e.g., central banks sales/purchases, political unrest, conflicts between nations, and general perceptions about inflation. Fluctuating
metal prices may have a significant impact on our results of operations and operating cash flow. Decreasing mineral prices will
adversely affect the market values of our properties and may lead to the recording of asset impairments.



Hedging Risks Related to Precious Metal Production
and Key Operating Inputs



On December
9, 2009, the Company closed a private placement (the “Gold Bond Financing”) of $14.5 million of gold bonds (the “Gold
Bonds”). The Gold Bond Financing pays the equivalent value of approximately814 ounces of gold per quarter representing
less than 9 percent of Briggs expected annual gold production in 2013.



The Company may from time to time enter
into gold hedge contracts to protect against declines in the price of gold or it may also enter into consumable off-take agreements
that may protect against the increasing cost of consumables such as diesel fuel. The Company’s goal is to protect the Company’s
cash flows against declining gold prices or increasing diesel prices. The Company’s primary risk mitigation for hedge transactions
is its policy to limit net hedge levels to 50 percent of its expected gold production or diesel usage. Although a hedging program
is designed to protect cash flow against a decline in the price of gold or rise in the price of diesel fuel, it could also limit
the Company’s gold realizations during periods of increasing gold prices or could increase diesel costs during periods of
declining diesel prices.



Operating Hazards and Risks



Mining operations generally involve a high
degree of risk, which even a combination of experience, knowledge and careful evaluation may not be able to overcome. Hazards such
as unusual or unexpected geologic structures and other conditions are involved. Operations in which the Company has a direct or
indirect interest will be subject to all of the hazards and risks normally incidental to exploration, development and production
of precious and base metals, any of which could result in work stoppages, damage to or destruction of mines and other producing
facilities, damage to life and property, environmental damage and possible legal liability for any or all damage. The Company maintains
liability insurance in an amount that it considers adequate for its operations; however, the Company may become subject to liabilities
due to events of pollution, slope failure, cave-in, flood or other hazards against which it cannot insure or against which it may
elect not to insure. The payment of such liabilities may have a material adverse effect on the Company’s financial position.



11







Exploration and Development



Mineral exploration and development involves
a high degree of risk and few properties explored ultimately are developed into producing mines. There is no assurance that Atna’s
mineral exploration and development activities will result in any discovery or development of bodies of commercial ore. The long-term
profitability of Atna’s operations will be in part directly related to the cost and success of its exploration programs,
which may be affected by a number of factors.



Substantial expenditures are required to
establish reserves through drilling, to develop metallurgical processes to extract metal from ore and to develop the mining and
processing facilities and infrastructure at any site chosen for mining. Although substantial benefits may be derived from the discovery
of a major mineralized deposit, no assurance can be given that minerals will be discovered in sufficient quantities to justify
commercial operations or that the funds required for development can be obtained on a timely basis.



The marketability of any minerals acquired
or discovered may be affected by numerous factors which are beyond the Company’s control and which cannot be accurately predicted,
such as market fluctuations, the proximity and capacity of milling facilities, mineral markets and processing equipment, and other
factors such as government regulations, including regulations relating to royalties, allowable production, importing and exporting
minerals and environmental protection.



Calculation of Reserves and Resources and Precious
and Base Metal Recovery



There is a degree of uncertainty attributable
to the calculation of reserves and resources and corresponding grades being mined or dedicated to future production. Until reserves
or resources are actually mined and processed, the quantity of mineralization and grades must be considered as estimates only.
In addition, the quantity of reserves and resources may vary depending on metal prices, operating costs, and design parameters.
Any material change in quantity of reserves, resources, grade or stripping ratio may affect the economic viability of the Company’s
properties. In addition, there can be no assurance that precious or other metal recoveries in small-scale laboratory tests will
be duplicated in larger scale tests under on-site conditions or during production.



Government Regulation



Operations, development and exploration
on the Company’s properties are affected to varying degrees by government regulations relating to matters such as, but not
limited to, environmental protection; health, safety and labour; mining law reform; homeland security; restrictions on production;
price controls; tax increases; maintenance of claims; tenure; and expropriation of property. There is no assurance that future
changes in such regulation, if any, will not adversely affect the Company’s operations.



Environmental Factors



All phases of the Company’s operations
are subject to environmental regulation and permitting in the various jurisdictions in which the Company operates. Environmental
legislation is evolving in a manner that will require stricter standards and enforcement, increased fines and penalties for non-compliance,
more stringent environmental assessments of proposed projects and a heightened degree of responsibility for companies and their
officers, directors and employees. There is no assurance that future changes in environmental regulation, if any, will not adversely
affect the Company’s operations. Environmental hazards may exist on the Company’s properties unknown to the Company
at present, which have been caused by previous or existing owners or operators of the properties.



Competition and Agreements with Other Parties



The mining industry is intensely competitive
at all phases, and the Company competes with many companies possessing greater financial and technical resources than those of
the Company. Competition in the mining business could adversely affect the Company’s ability to acquire suitable producing
properties or prospects for mineral exploration in the future.



12







The Company may, in the future, be unable
to meet its share of costs incurred under agreements to which it is a party and the Company may have its interest in the properties
subject to such agreements reduced as a result. Furthermore, if other parties to such agreements do not meet their share of such
costs, the Company may be unable to finance the cost required to complete recommended programs.



Ongoing Financing



The business of mineral exploration and
extraction involves a high degree of risk with very few properties that are explored ultimately achieving commercial production.
As a mining company in the exploration, development and mining stage, the ability of the Company to conduct exploration, development
and mining operations is affected principally by its ability to raise adequate amounts of capital through equity financings, debt
financings, joint ventures or joint operations of projects, asset sales and other means. In turn, the Company’s ability to
obtain funding depends in part upon the market’s perception of its management and properties, the price of gold, the marketability
of its securities, the attractiveness of its non-core assets for sale and its creditworthiness with potential lenders. There is
no assurance that the Company will be successful in obtaining required financing.



Cash Flow



Briggs is the Company’s sole operating
unit and source of operating cash flow. Any positive cash flow developed from Briggs may be used to fund some or all of the Company’s
corporate overhead, exploration and project development costs. Pinson underground is under development and is not yet a source
of operating cash flow. The Company has limited financial resources and there is no assurance that additional funding will be available
to allow the Company to accomplish its stated goals or to fulfill its obligations on existing development, exploration or joint
venture properties. Failure to obtain additional financing could result in delay or indefinite postponement of further development
and/or exploration and the possible, partial or total loss of the Company’s interest in certain properties.



Conflict of Interest



Certain directors and officers of the Company
are officers and/or directors of, or are associated with other natural resource companies that acquire interest in mineral properties.
Such associations may give rise to conflicts of interest from time to time. The directors are required by law, however, to act
honestly and in good faith with a view to the best interests of the Company and its shareholders and to disclose any personal interest
which they may have in any material transactions which are proposed to be entered into with the Company and to abstain from voting
as a director for the approval of any such transaction.



Title to Assets



Although the Company has or will receive
title opinions for any properties in which it has a material interest in Canada and the U.S., there is no guarantee that title
to such properties will not be challenged or impugned. The Company has not conducted surveys of all of the claims in which its
holds direct or indirect interests and therefore, the precise area and location of such claims may be in doubt. The majority of
the Company’s properties are located in the U.S. where mineral title is held through either patented or unpatented mining
claims, fee mineral rights, and as leased mineral interests. Members of the U.S. Congress have repeatedly introduced bills which
would supplant or alter the provisions of the Mining Law of 1872. If enacted, such legislation could change the cost of holding
unpatented mining claims and could impact our ability to develop mineral resources on unpatented mining claims. Such bills have
proposed, among other things, to either eliminate or greatly limit the right to a mineral patent and to impose a federal royalty
on production from unpatented mining claims. Although it is impossible to predict at this point what any legislated royalties might
be, enactment could adversely affect the potential for development of such mining claims and the economics of existing operating
mines on federal unpatented mining claims. Passage of such legislation could adversely affect the Company’s financial performance.



13







The Company’s Canadian mineral claims
may be subject to prior unregistered agreements or transfers or native land claims and title may be affected by undetected defects.
Native land claim settlements are more advanced in the Yukon Territory than they are in British Columbia, and none of the Company’s
properties in the Yukon Territory cover areas where the Federal Crown proposes to transfer mineral rights to the First Nations.
However, there is no guarantee that this will not change before settlements are finalized.



Dividends



The Company has not, since the date of
its incorporation, declared or paid any dividends on its Common Shares and does not currently intend to pay dividends. For the
foreseeable future, earnings, if any, are expected to be retained to finance further growth and development of the business of
the Company.



Resale of Shares



The continued operation of the Company
will be dependent upon its ability to generate operating revenues and to procure additional financing. There can be no assurance
that any such revenues can be generated or that other financing can be obtained. If the Company is unable to generate such revenues
or obtain such additional financing, any investment in the Company may be lost. In such event, the probability of resale of the
shares purchased would be diminished.



Joint Arrangements



Certain of the properties in which the
Company has an interest are operated through joint operations and joint ventures with other mining companies. The existence or
occurrence of one or more of the following circumstances and events could have a material adverse impact on the viability of the
Company’s interests held through joint arrangements and on the Company’s future cash flows, earnings, results of operations
and financial condition: (i) disagreements with joint arrangement partners on how to develop and operate mines efficiently;
(ii) inability of joint arrangement partners to meet their obligations to the joint arrangement or third parties; (iii) litigation
between joint arrangement partners regarding joint arrangement matters; (iv) the sale of a joint arrangement partner’s interest
to a third party; and (v) limited legal rights to influence the direction of project development where Atna is not the operator
of the project.



Potential Litigation



From time to time, during the ordinary
course of business, the Company and its subsidiaries and affiliates may be threatened with, or may be named as a defendant in various
actions, disputes, and legal proceedings, including claims of breach of contract, lost profits or other consequential damage claims.
A significant judgment against the Company or any of its subsidiaries or affiliates or a failure to settle any dispute on terms
satisfactory to the Company could have a material adverse effect on the Company’s ability to continue operations.



14







Risk Factors Specific to the Company



Gold Recovery at Briggs



CR Briggs Corporation, a wholly-owned subsidiary
of the Company, operates Briggs. Briggs has been producing gold since the second quarter of 2009 and produced approximately 37,000
ounces of gold doré during 2012. Briggs uses a conventional gold heap-leach recovery process. This process involves the
application of cyanide solutions by drip irrigation to crushed ore stacked on an impervious pad. As the solution percolates through
the heap, gold is dissolved from the ore into solution. This solution is collected and processed with activated carbon that collects
the gold from the solution. The gold laden carbon is further processed through pressure stripping the carbon into a more highly
concentrated gold bearing solution. The gold bearing solution is further concentrated by an electrowinning circuit, which collects
the gold onto electric cathodes which are then melted into gold doré bars. Factors impacting gold recovery include variation
in crushed ore size, ore grade, rock type, solution concentration, lime addition, temperature, rainfall, irrigation time, pressure
stripping, refining efficiencies, leach pad dynamics and other associated factors.



Production Costs and Risk Factors
at Briggs



The cost of gold produced may be impacted
by numerous variables including ore grade and gold recovery, stripping ratio, fuel and consumable costs, labor and benefit costs,
equipment operating and maintenance costs, and numerous other factors. Production risk factors may include labor strife, slope
failure, poor gold recovery, unavailability of skilled labor and management, availability of mining equipment, lack of machine
parts, availability of consumables used in mining, mine plan implementation, weather, governmental regulations and other operating
factors.



California Legislation and Regulations
May Cause the Development of Projects Adjacent To Briggs to Become Uneconomic.



On April 10, 2003, the California State
Mining and Geology Board enacted a Backfill Regulation (the “Backfill Regulation”) that requires that all future metal
mines, with certain exceptions, be backfilled to the approximate original contour of the landscape subject to certain limitations.
Any new open pit developments on our properties outside the existing Briggs plan of operations area may be required to comply with
the Backfill Regulation. However, certain California statutes and regulations recognizes that under certain circumstances existing
permit areas may be extended to incorporate mining locations necessary for the continued operation or expansion of the existing
operation without the backfilling requirement.



Atna Has Significant Obligations At
Its Mines, Which May Adversely Impact Liquidity.



Briggs operates under permits granted by
various agencies including the U.S. Department of the Interior Bureau of Land Management (the “BLM”), Inyo County,
California, the California Department of Conservation, and the Lahontan Regional Water Quality Control Board (“Lahontan”).
The Company has posted reclamation bonds with these agencies in the amount of $4.4 million, supported by sureties with the exception
of a $30,000 cash bond.



Pinson is beginning operations under permits
granted by various agencies including the BLM and the State of Nevada. The Company has posted reclamation bonds with these agencies
in the amount of $0.8 million, which is supported by a surety.



The Company has posted an additional $0.9
million of reclamation bonds with the State of Nevada for Reward, which is supported by a surety.



Please refer to the discussion of “Kendall,
Montana” property and reclamation requirements below. In addition to $2.3 million of cash deposits held as reclamation bonds,
the Company has posted an additional $0.2 million of reclamation bonds, supported by a surety, with the Montana Department of Environmental
Quality (“MDEQ”).



All surety bonds are subject to annual
review and adjustment.



15







Development of Pinson



The Company commenced development of the
Pinson underground mine in January 2012 and expects to initiate commercial gold production in 2013. This development has been funded
from cash, debt, equity sale, and Briggs’ cash flow. Supplemental financing to complete development, if required, may be
generated from asset sales, new or extended lines of credit, or an equity issuance. The Company’s 2013 budget and recent
forecasts indicate that supplemental financing will not be required; however this is contingent upon Pinson developing on schedule
and at projected costs.



Development of Reward



In January 2011, the Company commenced
Phase 1 infrastructure development work on Reward. The majority of this construction, which included construction of wildlife exclusion
fencing, drilling and completing the production water well, and extending power lines from local grid power sources to the mine
site, has been completed. Final development of Reward including the construction of leach pad facilities, purchase or lease of
a semi-portable crushing plant, the installation of offices, lab and shop facilities and pre-stripping of mine waste will commence
once development of Pinson has been completed or when adequate financing becomes available.



Montana Regulatory Authorities May
Impose Additional Reclamation Requirements On Our Closure Of The Kendall Mining Property



Atna’s
wholly-owned subsidiary, CR Kendall Corporation (“CRK”), is reclaiming and closing the Kendall mining property (“Kendall”)
located near Lewistown, Montana. In April 2012, CRK entered into an Agreement with the MDEQ, whereby Atna will provide financial
support to complete the final EIS closure study. As part of this Agreement, CRK submitted on July 25, 2012 an application to the
MDEQ providing a final closure and reclamation plan for the Kendall mine site. The MDEQ has agreed to perform a completeness review
of this plan supported by a closure EIS. The EIS will be managed by the MDEQ in consultation with CRK. Any costs in excess of the
EIS project budget will be shared equally between CRK and the MDEQ. In 2001, CRK deposited with the MDEQ approximately $1.9 million
in a fund to accomplish required reclamation work. This fund was never utilized and with accumulated interest now totals approximately
$2.3 million. Once a final Record of Decision on the final closure plan has been issued by the MDEQ, as part of the Agreement,
CRK will create a trust fund to provide for any future operation, maintenance and replacement of water treatment and closure facilities.
Funds remaining in the current funds on deposit with the MDEQ will be utilized in funding this trust.



ITEM
4.	INFORMATION ON THE COMPANY



| | A. | History and Development of the Company
| | -- | --------------------------------------



Atna Resources Ltd. was incorporated under
the Company Act of the Province of British Columbia, Canada, on May 30, 1984, by registration of its Memorandum and Articles
under its present name. The Company was extra-territorially registered in the Yukon Territory on April 13, 1995. The Company’s
business is to explore, acquire, develop, and mine precious metals, uranium and other mineral properties. The Company’s properties
are primarily located in the United States and Canada. The Company is a reporting issuer in British Columbia, Alberta, Ontario
and Nova Scotia and a Foreign Private Issuer in the U.S., based on the residency of stockholders as of June 30, 2012. The Company’s
common stock is listed on the Toronto Stock Exchange (the “TSX”) under the symbol “ATN” in Canada and on
the over-the-counter Bulletin Board (the “OTCQB”) under the symbol “ATNAF” in the U.S.



16







Atna merged with Canyon Resources Corporation
(“Canyon”) on March 18, 2008 (the “Canyon Merger”), at which time Canyon became a wholly-owned subsidiary
of the Company. Canyon was incorporated under the General Corporation Laws of the State of Delaware in 1979.



Atna’s headquarters are located at
14142 Denver West Parkway, Suite 250, Golden, Colorado, USA, 80401. The toll free telephone number for the Atna headquarters is
877-692-8182. Bull, Housser & Tupper LLP is the Company’s Canadian legal counsel and registered agent and is located
at 3000 Royal Centre, 1055 West Georgia Street, Vancouver, BC, Canada V6E 3R3.



The Company’s expenditures have included
those primarily for general corporate purposes (operations), exploration, capital and development, servicing debt, and the acquisition
of a 70 percent interest in Pinson discussed below. General corporate purposes primarily include: profit or loss on sales, exploration
expense, net interest expense, expenditures to build inventories and other working capital, and spending on asset retirement obligations.
A summary of the Company’s significant expenditures is set forth below, as well as a summary of amounts expended on exploration,
both capitalized and expensed. Virtually all of the Company’s investments in the last three years have been in the western
U.S.





|Net Uses of Cash                                    |  | 2012 |            |  | 2011 |   |            | 2010 |  |   | Total      |  
|--------------------------------------------------- |  | ---- | ---------- |  | ---- | - | ---------- | ---- |  | - | ---------- | -
|                                                    |  |      |            |  |      |   |            |      |  |   |            |  
|Net use by Operations                               |  |      | N/A        |  |      |   | N/A        |      |  | $ | 259,500    |  
|Purchases and development of property and equipment |  | $    | 21,705,700 |  |      | $ | 9,929,500  |      |  |   | 1,558,300  |  
|Increases in restricted cash / surety deposits      |  |      | N/A        |  |      |   | 686,700    |      |  |   | 988,400    |  
|Pinson purchase price                               |  |      | N/A        |  |      |   | 15,000,000 |      |  |   | -          |  
|Capitalized loan interest - Pinson                  |  |      | 2,161,400  |  |      |   | 700,100    |      |  |   | -          |  
|Additions of stripping activity assets              |  |      | 540,500    |  |      |   | 4,033,900  |      |  |   | 4,481,300  |  
|Repayments of Debt                                  |  |      | 5,573,900  |  |      |   | 5,989,400  |      |  |   | 5,133,600  |  
|Effect of exchange rate changes                     |  |      | 6,500      |  |      |   | 23,000     |      |  |   | (12,800    | )
|Total uses of cash                                  |  | $    | 29,988,000 |  |      | $ | 36,362,600 |      |  | $ | 12,408,300 |  
|                                                    |  |      |            |  |      |   |            |      |  |   |            |  
|Exploration spending                                |  | $    | 2,155,000  |  |      | $ | 3,584,300  |      |  | $ | 1,562,800  |  
|Exploration capitalized                             |  |      | 421,700    |  |      |   | 2,949,400  |      |  |   | 454,100    |  
|Exploration expensed                                |  | $    | 1,733,300  |  |      | $ | 634,900    |      |  | $ | 1,108,700  |  



The Company’s expenditures have been
financed primarily by operations, proceeds from the sale of investments and assets, debt financings, and equity financings as follows.





|Net Sources of Cash                         |  | 2012 |            |  | 2011 |   |            | 2010 |  |   | Total     | 
|------------------------------------------- |  | ---- | ---------- |  | ---- | - | ---------- | ---- |  | - | --------- | 
|                                            |  |      |            |  |      |   |            |      |  |   |           | 
|Net contributions by Operations             |  | $    | 13,590,500 |  |      | $ | 15,498,700 |      |  |   | N/A       | 
|Proceeds from sale of investments           |  |      | 833,600    |  |      |   | 465,600    |      |  | $ | 258,900   | 
|Preproduction gold sales                    |  |      | 1,353,100  |  |      |   | -          |      |  |   | -         | 
|Proceeds from insurance settlement          |  |      | 435,800    |  |      |   | -          |      |  |   | -         | 
|Decrease in restricted cash/surety deposits |  |      | 391,000    |  |      |   | N/A        |      |  |   | N/A       | 
|Proceeds from asset sales                   |  |      | 135,800    |  |      |   | 471,500    |      |  |   | 287,600   | 
|Exercise of stock options                   |  |      | 337,400    |  |      |   | 74,900     |      |  |   | 101,800   | 
|Exercise of warrants                        |  |      | 5,960,100  |  |      |   | 122,900    |      |  |   | -         | 
|Net Proceeds from equity financings         |  |      | 16,330,500 |  |      |   | -          |      |  |   | 8,292,900 | 
|Net Proceeds from debt financings           |  |      | -          |  |      |   | 20,098,900 |      |  |   | -         | 
|Total financing sources                     |  | $    | 39,367,800 |  |      | $ | 36,732,500 |      |  | $ | 8,941,200 | 





17







Atna expects that cash requirements over the
next 12 months, including those for investments in mine development and servicing existing debt, can be met through a combination
of cash flow from the Briggs and Pinson operations, existing cash, and equipment financing. Supplemental financing, if required,
may be generated from the issuance of debt, convertible bonds, or equity; new lines of credit; asset sales; or combinations thereof.
As of December 31, 2012, the Company had net working capital (current assets less current liabilities) of $6.4 million. Current
assets included cash of $19.3 million and recoverable gold inventories of approximately 16,600 ounces at Briggs and approximately
820 payable ounces at Pinson which had a combined cost or recorded value of $19.7 million. The gold inventory had a gross market
value of approximately $29.0 million based on the period-end gold price of $1,664 per ounce.



The two principal uses of funds anticipated
within the next 12 months is expected to be completion of development funding for the Pinson underground mine. The total project
cost is expected to be approximately $31 million, of which $22.8 million has been spent through December 31, 2012 net of pre-production
sales and asset retirement obligation adjustments. The second principal use of funds anticipated within the next 12 months is expected
to be the reduction of debt. C$1.46 million is due to Sprott Resource Lending Partnership (“Sprott”) for each of the
12 months beginning September 30, 2013. Quarterly principal and estimated derivative payments of $1.3 million are due to the 2009
Gold Bond holders through December 31, 2013.



| | B. | Business Overview
| | -- | -----------------



The Company is involved in all phases of
the mining business from exploration, development drilling, preparation of feasibility studies, permitting, construction, operation
and final closure of mining properties. Atna’s ongoing exploration and development efforts are focused primarily on precious
metals in the western United States. The Company conducts a portion of its mineral exploration and development activities through
joint arrangements with other companies.



Production at Briggs during 2012 included
the mining of 2.5 million tons of gold ore containing 45,900 ounces of gold at a strip ratio of 2.4 tons of waste per ton of ore
to produce 36,900 ounces of gold in doré. Approximately 35,700 ounces of gold were sold at an average gold price of $1,667
per ounce. Estimated mined recoverable gold inventory at year-end was 16,600 contained ounces in all stages of processing.



The Company’s primary focus for 2013
is to increase the value of its four core gold mining properties: Briggs, Pinson, Reward and the Columbia mining project (“Columbia”).
The Company’s near-term strategy is to focus on increasing positive cash flow from production operations at Briggs with the
goal of reaching targeted production rates of 35,000 to 43,000 ounces in 2013. Development of the Pinson underground mine is now
the Company's top development priority. The mine is anticipated to achieve commercial production in 2013 with a production target
of 50,000 to 57,000 ounces for the year. The Company substantially completed Phase 1 infrastructure development activities at Reward
during 2011, but further work is being postponed until development activities at Pinson have been completed or until such time
that additional cash funding becomes available. The Company intends to initiate feasibility and permitting work at Columbia and
to complete a feasibility study for open pit mining at Pinson during 2013. The Company believes these activities will provide a
long term pipeline of development opportunities for the Company.



Atna’s 2008 sale of its royalty portfolio
provided approximately $20 million of net proceeds, which was sufficient to re-start and operate Briggs without additional financing
until October 2009 when Atna closed C$1.5 million in convertible debentures. In December 2009, the Company closed the Gold Bond
Financing of $14.5 million and in December 2010, the Company closed a $9.2 million bought deal equity offering. Briggs began operations
in 2009 and has provided net positive operating cash flows since the fourth quarter of 2010. In September 2011, the Company closed
a C$20 million debt facility to fund the acquisition of the remaining 70 percent interest in Pinson as further described under
“D. Property, Plant and Equipment – Production Property – Pinson Mine Property, Nevada” and to provide
initial start-up capital for that project. The term of this debt facility (“Sprott Loan”) was extended in February
2012, C$2.5 million was repaid in February 2013, and in March 2013 the term of the remaining C$17.5 million was amended to be payable
in 12 monthly increments beginning September 30, 2013. The exercise of options and warrants during 2012 resulted in net proceeds
to the Company of $6,297,500. In September 2012, the Company closed a $17.25 million stock offering, netting $16.3 million in proceeds.



18







The Company’s financial results are
not significantly impacted by seasonality. Quarterly expenses and income vary depending on the volume of ore mined and processed;
ore grades; stripping ratios; labor, diesel, chemical, tire, and maintenance costs; realized and unrealized gains and losses on
derivatives; gains or losses on the sale of investments and disposals of properties; and other factors. Consumable materials used
in the production and processing of gold ores have increased significantly in price during the past three years. Maintenance costs
increased in 2012 due the consumption of wear-items and as related to the crushing circuit at Briggs, prior to rebuilding or replacing
much of the circuit. Competition for experienced mining staff has also increased the costs of doing business. Fuel cost is a significant
cost factor and fuel costs have been volatile and generally increasing over the last three years. In 2012, diesel fuel represented
over 21 percent of cost of sales whereas in 2011, diesel fuel represented over 25 percent of cost of sales. In 2012 relative to
2011, diesel fuel prices increased 4 percent and were more than offset by a five percent decrease in the volume consumed. In 2011
relative to 2010, diesel fuel costs increased approximately 57 percent, approximately 19 percent due to the volume consumed as
operations expanded and approximately 32 percent due to increased prices.



The Company’s strategy is to develop
new mines organically using the cash flow from existing mines. In 2013, the Company intends to complete the development the underground
mine at Pinson and bring it into commercial production, principally using existing cash and the cash flows from Briggs and proceeds
from the September 2012 stock offering. The Company intends to utilize its existing property positions to increase shareholder
value by taking a property portfolio approach. The Company intends to sell or trade those properties that are not core to the Company’s
business and seek to develop those properties that can be developed economically in a timely manner to create the cash flow that
will support and pay for further growth. At the same time, the Company intends to create an increasingly valuable pipeline of development
properties through drilling in existing mine areas, property acquisitions and joint ventures to enhance future growth prospects.



Demand for gold as a safe haven against
economic turmoil, currency devaluations and other factors in the financial marketplace has more of an impact on the price of gold
than does the annual production of gold. Our principal acquisition objective is to acquire mining prospects that provide a reasonable
return on capital upon development. The Company believes it is positioned with a solid cash balance and existing and near term
gold production to acquire mineral properties in a later stage of exploration. These opportunities may include properties that
were closed due to lack of capital. The Company continually reviews acquisition opportunities that could provide potential long
term value through further investment. The Company targets acquisitions that have the potential to provide positive cash flow over
a significant operating reserve life and annually produce over 100,000 ounces of gold. The target property would need to be located
in a setting where positive community relations may exist, where development of that property would not create long term environmental
issues, and where there is a reasonable chance of obtaining the required permits.



Regulatory agencies, both state, county,
and federal, having authority over the Company’s exploration, development and mining are numerous and include, but are not
limited to, Mine Safety and Health Administration (“MSHA”), U.S. Department of Occupational Safety and Health (“OSHA”)
Department of the Interior, Bureau of Land Management (“BLM”), U.S. Forest Service (“USFS”) U.S. Department
of Alcohol Tobacco and Firearms (“BATF”), U.S. Department of Homeland Security, U.S. Environmental Protection Agency
(“EPA”), U.S. Corp of Engineers on the Federal level. On the State level the Company is subject to regulation by the
California Department of Occupational Safety and Health (“CAL-OSHA”), Great Basin Unified Air Pollution Control District,
California Regional Water Quality Control Board, California Department of Fish and Game, California Environmental Protection Agency
(“CEPA”), Nevada Division of Environmental Protection (“NDEP”) and the Montana Department of Environmental
Protection ("MDEP").



19







Numerous factors affect the marketing of
metals, many of which are beyond our control. Such factors include the price of the mineral in the marketplace, imports of metals
from other nations, demand for metals, the availability of adequate refining and milling facilities, and the market price of competitive
metals used in the same industrial applications. The market price of metals is extremely volatile and beyond our control. Gold
and silver prices are generally influenced by basic supply/demand fundamentals, inflation, alternative investment markets, and
the strength or weakness of the U.S. Dollar. The market dynamics of supply/demand can be heavily influenced by economic policy;
e.g., central banks sales/purchases, political unrest, conflicts between nations, and general perceptions about inflation. Fluctuating
metal prices may have a significant impact on our results of operations and operating cash flow. Decreasing mineral prices will
adversely affect the market values of our properties and may lead to the recording of asset impairments.



The decision to put a mine into production
and the commitment of the funds necessary for that purpose must be made long before the first revenues from production will be
received. Over the last five years, between 2008 and 2012, the average annual London PM Fix price per ounce of gold has steadily
increased from $847 to $1,664. The economics of a mine may change over time due to gold price fluctuations during the project’s
life. Although it is possible in certain circumstances to protect against price fluctuations by hedging, at a cost, the volatility
of mineral prices represents a substantial risk to the mining industry. The Company’s open hedge positions as of December
31, 2012, consist solely of those embedded in the 2009 Gold Bonds.



The exploration, development, and production
programs conducted in the U.S. are subject to local, state, and federal regulations regarding environmental protection. A significant
amount of the mining and exploration activities are conducted on public lands. The BLM regulations cover mining operations carried
out on most public lands. Exploration for or the production of minerals are subject to existing laws and regulations relating to
exploration procedures, safety precautions, employee health and safety, air quality standards, pollution of water sources, waste
materials, odor, noise, dust and other environmental protection requirements adopted by federal, state and local governmental authorities.
As a result, environmental assessment or environmental impact studies may be required before any proposed exploration work or production
activities can be commenced. The requirements imposed by any such authorities may be costly, time consuming, and may delay operations.
Future legislation and regulations designed to protect the environment, as well as future interpretations of existing laws and
regulations, may require substantial increases in equipment and operating costs and delays, interruptions, or a termination of
operations. We cannot accurately predict or estimate the impact of any such future laws or regulations, or future interpretations
of existing laws and regulations, on our operations.



The U.S. has an extensive framework of
environmental legislation that undergoes constant revision. We participate in the legislative process through independent contact
with legislators and through trade organizations to assist legislative bodies in making informed decisions.



Historic mining activities have occurred
on certain of the Company’s properties. In the event that such historic activities have resulted in releases or threatened
releases of regulated substances into the environment there exists the potential for liability under federal or state remediation
statutes. Except as discussed in the Company’s periodic filings with the SEC, the Company is not aware of any pending claims
under these statutes at this time, and cannot predict whether any such claims will be asserted in the future.



20







Environmental regulations add to the cost
and time needed to bring new mines into production and add to operating and closure costs for mines already in operation. As mines
are placed into production, the costs associated with regulatory compliance can be expected to increase. Such costs are a normal
cost of doing business in the mining industry, and may require significant capital and operating expenditures in the future. The
Company believes that it is currently in material compliance with all applicable environmental regulations and there are no material
enforcement procedures currently ongoing.



| | C. | Organizational Structure
| | -- | ------------------------



The Company owns all of the issued and
outstanding shares of the common stock of Canyon. The organizational chart below reflects the Company’s legal ownership of
its significant subsidiaries and ownership interests in various gold properties as of the date of this Annual Report on Form 20-F.
Properties are routinely acquired, sold, subjected to a joint-venture, or abandoned in the ordinary course of business.







21







| | D. | Property, Plant and Equipment
| | -- | -----------------------------



Summary of Mineral Reserves and Resources



The mineral reserve and resource figures
below are estimates, subject to forward-looking-statement limitations. All reserve and resource figures are considered current
as indicated in the footnotes to the tables. The scientific and technical information about the Company’s mineral properties
contained in this Report has been prepared under the supervision of, reviewed by and approved by William Stanley, a Registered
Member of the Society for Mining, Metallurgy and Exploration, a Licensed Geologist, the Company's Vice President Exploration, and
Daniel Saint Don, a Professional Engineer in the province of Ontario, both “qualified persons” as that term is defined
in NI 43-101.



The mineral resources reported below, other
than those declared as proven and probable mineral reserves, have no demonstrated economic viability at this time. The quantity
and grade of reported inferred resources in these estimations are based on limited information and should be considered conceptual
in nature. It is uncertain if further exploration will result in discovery of a measured or indicated mineral resource within those
areas classified as inferred.



Gold Mineral Reserves - Proven and
Probable (1, 2, 3)



|Category                           |  | Tons (x 1,000) |        |  | Au (oz/ton) |  |       | Contained
                                                                                Ounces | 
|---------------------------------- |  | -------------- | ------ |  | ----------- |  | ----- | ------------------------------------------------------------------------------------------------ | 
|Briggs (1) – 100% Atna             |  |                |        |  |             |  |       |                                                                                                  | 
|Proven                             |  |                | 4,536  |  |             |  | 0.020 |                                                                                                  | 
|Probable                           |  |                | 4,753  |  |             |  | 0.020 |                                                                                                  | 
|Briggs Reserves                    |  |                | 9,290  |  |             |  | 0.020 |                                                                                                  | 
|Reward (2) – 100% Atna             |  |                |        |  |             |  |       |                                                                                                  | 
|Proven                             |  |                | 3,810  |  |             |  | 0.024 |                                                                                                  | 
|Probable                           |  |                | 8,536  |  |             |  | 0.021 |                                                                                                  | 
|Reward Reserves                    |  |                | 12,347 |  |             |  | 0.022 |                                                                                                  | 
|Pinson Underground (3) – 100% Atna |  |                |        |  |             |  |       |                                                                                                  | 
|Proven                             |  |                | 1,003  |  |             |  | 0.366 |                                                                                                  | 
|Probable                           |  |                | 736    |  |             |  | 0.373 |                                                                                                  | 
|Pinson Underground Reserves        |  |                | 1,739  |  |             |  | 0.369 |                                                                                                  | 
|                                   |  |                |        |  |             |  |       |                                                                                                  | 
|Total Reserves                     |  |                | 23,376 |  |             |  | 0.047 |                                                                                                  | 



| | (1) | Briggs mineral reserve summary is based on a 0.007 oz/ton incremental
leach cut-off grade calculated using $1,490 per ounce gold supported by the report titled “2012 NI 43-101 Technical Report
on the Briggs Mine, Inyo County, California” dated May 29, 2012 with an effective date of March 26, 2012 (the “Briggs
Report”) prepared by Alan C. Noble, P.E. of Ore Reserves Engineering, Michael J. Read, SME-RM of Chlumsky, Armbrust &
Meyer LLC, William R. Stanley, SME-RM, V.P. Exploration of the Company, and Douglas E. Stewart, P.E., V.P. and COO of the Company.
Messrs. Noble and Read are independent qualified persons in accordance with NI 43-101 and Messrs. Stanley and Stewart are non-independent
qualified persons in accordance with NI 43-101. The Briggs Report was filed on SEDAR on May 22, 2012. The mineral reserve has been
updated and reconciled for mine production in 2012 and is current as of December 31, 2012.
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (2) | Reward mineral reserve is current as of December 31, 2012, using a>$0.01
net incremental value and $1,490 per ounce gold price, and is supported by the Reward Report filed on SEDAR on July 9, 2012.
| | --- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (3) | Pinson Underground reserve is current as of December 31, 2012, reported using a $1,300 gold price
and a cutoff grade of 0.2oz/ton and has been reconciled for mine development production in 2012, as supported by the Pinson Report
filed on SEDAR on May 31, 2012.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



22







Gold Mineral Resources - Measured,
Indicated and Inferred (1, 2, 3, 4, 5, and 6)



|Category                     |  | Tons (x 1,000) |        |  | Au (oz/ton) |  |       | Contained Ounces | 
|---------------------------- |  | -------------- | ------ |  | ----------- |  | ----- | ---------------- | 
|Measured                     |  |                |        |  |             |  |       |                  | 
|Briggs (1, 2)                |  |                | 10,358 |  |             |  | 0.021 |                  | 
|Reward (1, 3)                |  |                | 4,692  |  |             |  | 0.023 |                  | 
|Pinson Underground (1, 4)    |  |                | 1,611  |  |             |  | 0.355 |                  | 
|Pinson Open Pit (4)          |  |                | 21,158 |  |             |  | 0.035 |                  | 
|Columbia (5)                 |  |                | 5,730  |  |             |  | 0.047 |                  | 
|Cecil R (6)                  |  |                | 858    |  |             |  | 0.024 |                  | 
|Total Measured               |  |                | 44,407 |  |             |  | 0.042 |                  | 
|Indicated                    |  |                |        |  |             |  |       |                  | 
|Briggs (1, 2)                |  |                | 20,293 |  |             |  | 0.019 |                  | 
|Reward (1, 3)                |  |                | 13,363 |  |             |  | 0.019 |                  | 
|Pinson Underground (1, 4)    |  |                | 1,301  |  |             |  | 0.383 |                  | 
|Pinson Open Pit (4)          |  |                | 4,307  |  |             |  | 0.058 |                  | 
|Columbia (5)                 |  |                | 11,294 |  |             |  | 0.043 |                  | 
|Cecil R (6)                  |  |                | 2,382  |  |             |  | 0.022 |                  | 
|Total Indicated              |  |                | 52,940 |  |             |  | 0.036 |                  | 
|Measured and Indicated       |  |                |        |  |             |  |       |                  | 
|Briggs ( 1, 2)               |  |                | 30,651 |  |             |  | 0.020 |                  | 
|Reward (1, 3)                |  |                | 18,055 |  |             |  | 0.020 |                  | 
|Pinson Underground (1, 4)    |  |                | 2,912  |  |             |  | 0.368 |                  | 
|Pinson Open Pit (4)          |  |                | 25,466 |  |             |  | 0.039 |                  | 
|Columbia (5)                 |  |                | 16,664 |  |             |  | 0.045 |                  | 
|Cecil R (6)                  |  |                | 3,240  |  |             |  | 0.023 |                  | 
|Total Measured and Indicated |  |                | 96,988 |  |             |  | 0.039 |                  | 
|                             |  |                |        |  |             |  |       |                  | 
|Inferred                     |  |                |        |  |             |  |       |                  | 
|Briggs (2)                   |  |                | 12,940 |  |             |  | 0.018 |                  | 
|Reward (3)                   |  |                | 4,757  |  |             |  | 0.014 |                  | 
|Pinson Underground (4)       |  |                | 2,236  |  |             |  | 0.378 |                  | 
|Pinson Open Pit (4)          |  |                | 824    |  |             |  | 0.034 |                  | 
|Columbia (5)                 |  |                | 10,705 |  |             |  | 0.042 |                  | 
|Cecil R (6)                  |  |                | 5,144  |  |             |  | 0.019 |                  | 
|Total Inferred               |  |                | 36,606 |  |             |  | 0.047 |                  | 



Silver Mineral Resources (Columbia)-
Measured, Indicated and Inferred (5)



|Category                     |  | Tons (x 1,000) |        |  | Ag (oz/ton) |  |       | Contained Ounces | 
|---------------------------- |  | -------------- | ------ |  | ----------- |  | ----- | ---------------- | 
|Measured (5)                 |  |                | 5,370  |  |             |  | 0.155 |                  | 
|Indicated (5)                |  |                | 11,295 |  |             |  | 0.115 |                  | 
|Total Measured and Indicated |  |                | 16,665 |  |             |  | 0.128 |                  | 
|                             |  |                |        |  |             |  |       |                  | 
|Total Inferred (5)           |  |                | 10,705 |  |             |  | 0.097 |                  | 



23







| | 1. | Mineral Resources for Briggs, Reward and Pinson Underground include Proven and Probable Reserves
| | -- | ------------------------------------------------------------------------------------------------

| | 2. | NI 43-101 Technical Report Briggs Mine, dated May 29, 2012; 0.006 oz/ton gold cut-off, adjusted
for 2012 production and other changes during production.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------

| | 3. | NI 43-101 Technical Report Reward Gold Project, dated June 29, 2012; 0.006 oz/ton gold cut-off
| | -- | ----------------------------------------------------------------------------------------------

| | 4. | NI 43-101 Technical Report, Pinson Project, May 25, 2012; 0.20 oz/ton gold cut-off (Underground);
0.010 oz/ton gold cut-off (Open Pit)
| | -- | --------------------------------------------------------------------------------------------------------------------------------------

| | 5. | NI 43-101 Technical Report Columbia Gold Property, June 2010; 0.010 oz/ton gold cut-off.
| | -- | ----------------------------------------------------------------------------------------

| | 6. | NI 43-101 Technical Report Cecil R Gold Property, March 2010; using a 0.010 oz/ton gold cut-off.
| | -- | ------------------------------------------------------------------------------------------------



Cautionary Note to US Investors concerning
estimates of Measured and Indicated Resources: This section uses the terms “measured” and “indicated” mineral
resources. The Company advises US investors that while those terms are recognized and required by Canadian regulations, the SEC
does not recognize them. US investors are cautioned not to assume that any part or all of mineral resources in these categories
will ever be converted into reserves.



Cautionary Note to US Investors concerning
estimates of Inferred Resources: This section uses the term “inferred” mineral resources. The Company advises US investors
that while this term is recognized and required by Canadian regulations, the SEC does not recognize it. “Inferred”
mineral resources have a great amount of uncertainty as to their existence, and great uncertainty as to their economic and legal
feasibility. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher category.
Under Canadian rules, estimates of inferred mineral resources may not form the basis of feasibility or pre-feasibility studies,
except in rare cases. US investors are cautioned not to assume that part or all of an inferred resource exist, or is economically
or legally minable.



PRODUCTION PROPERTY



Briggs Mine, California



The Briggs gold mining property (“Briggs”)
was acquired by the Company in 1990. The Briggs mine was initially constructed in 1995; production ceased in 2004 due to gold-market
conditions, and commercial production recommenced in mid-2009. Briggs is a conventional open pit mine that uses heap leach gold
recovery. Ore is crushed to a targeted 80 percent passing a 1/4 inch-slot prior to placement on the leach pad, and targeted gold
recovery is 80 percent.



Briggs is located on the west side of the
Panamint Range near Death Valley, California. From the city of Ridgecrest, Briggs is accessed by State Highway 178, which passes
through the mining town of Trona and to the ghost town of Ballarat, a distance of 42 miles. The mine is reached from Ballarat by
means of an improved dirt road which heads south and skirts the east side of Panamint Valley, a distance of eight miles. The legal
description of the project area is Townships 21 through 23 South, and Ranges 44 through 45 East, Mount Diablo Meridian.



The Briggs mine is located on 156 unpatented
claims, including 15 mill site claims, covering approximately 2,890 acres, on land administered by the BLM. No royalties are payable
at Briggs. In addition to Briggs, the Company owns or controls four satellite projects (“Briggs Satellite Projects”)
totaling 2,505 acres located between two and four miles north of Briggs: Cecil R, which includes 48 claims; the Jackson project
(“Jackson”) located on 40 unpatented claims, two patented claims and one patented mill site; and the Mineral Hill project
(“Mineral Hill”) and Suitcase projects (“Suitcase”) located on 48 unpatented claims. All of the mining
claims are located on land prescribed for multiple use management by the BLM.



24







In 2013, Briggs is expected to produce
and sell approximately 35,000 to 43,000 ounces of gold at an annual average cash cost of between $850 and $900 per ounce. Full
cost, including sustaining capital and depreciation, is budgeted to be between $1,070 and $1,120 per ounce. Briggs is budgeted
to crush and place on the leach pad approximately 3.0 to 3.2 million tons of ore containing 58,000 to 66,000 ounces of gold. The
waste stripping ratio is projected to be 3.8 tons of waste per ton of ore. The Company and Briggs are committed by terms of the
2009 Gold Bonds to pay bondholders the equivalent of 3,257 ounces of gold in 2013 in equal quarterly installments at near-quarter-end
market prices, however these 2013 payments will retire the obligation.









25







Production details for Briggs in 2012 and
2011 are shown in the following tables:





|                                  |  | First   |           |  | Second  |   |           | Third   |  |   | Fourth    |  |  | Total |          
|--------------------------------- |  | ------- | --------- |  | ------- | - | --------- | ------- |  | - | --------- |  |  | ----- | ---------
|Production Statistics for 2012    |  | Quarter |           |  | Quarter |   |           | Quarter |  |   | Quarter   |  |  | 2012  |          
|Waste tons                        |  |         | 1,719,500 |  |         |   | 1,348,100 |         |  |   | 1,201,100 |  |  |       | 1,718,900
|Ore tons                          |  |         | 712,400   |  |         |   | 581,500   |         |  |   | 634,600   |  |  |       | 599,200  
|Total tons                        |  |         | 2,431,900 |  |         |   | 1,929,600 |         |  |   | 1,835,700 |  |  |       | 2,318,100
|Strip ratio (waste / ore)         |  |         | 2.4       |  |         |   | 2.3       |         |  |   | 1.9       |  |  |       | 2.9      
|Ore grade (oz/ton)                |  |         | 0.018     |  |         |   | 0.020     |         |  |   | 0.017     |  |  |       | 0.019    
|Contained gold ounces mined       |  |         | 12,500    |  |         |   | 11,600    |         |  |   | 10,700    |  |  |       | 11,100   
|Gold ounces sold                  |  |         | 9,400     |  |         |   | 8,100     |         |  |   | 8,600     |  |  |       | 9,600    
|Recoverable gold ounces inventory |  |         | 16,600    |  |         |   | 17,700    |         |  |   | 16,700    |  |  |       | 16,600   
|Cash cost of gold sales ($/oz)    |  | $       | 911       |  |         | $ | 928       |         |  | $ | 1,037     |  |  | $     | 1,061    





|                                  |  | First   |           |  | Second  |   |           | Third   |  |   | Fourth    |  |  | Total |          
|--------------------------------- |  | ------- | --------- |  | ------- | - | --------- | ------- |  | - | --------- |  |  | ----- | ---------
|Production Statistics for 2011    |  | Quarter |           |  | Quarter |   |           | Quarter |  |   | Quarter   |  |  | 2011  |          
|Waste tons                        |  |         | 2,766,400 |  |         |   | 2,627,900 |         |  |   | 2,512,300 |  |  |       | 1,983,100
|Ore tons                          |  |         | 608,400   |  |         |   | 662,600   |         |  |   | 615,800   |  |  |       | 759,100  
|Total tons                        |  |         | 3,374,800 |  |         |   | 3,290,500 |         |  |   | 3,128,100 |  |  |       | 2,742,200
|Strip ratio (waste / ore)         |  |         | 4.5       |  |         |   | 4.0       |         |  |   | 4.1       |  |  |       | 2.6      
|Ore grade (oz/ton)                |  |         | 0.015     |  |         |   | 0.016     |         |  |   | 0.018     |  |  |       | 0.017    
|Contained gold ounces mined       |  |         | 8,900     |  |         |   | 10,700    |         |  |   | 11,000    |  |  |       | 12,900   
|Gold ounces sold                  |  |         | 6,600     |  |         |   | 7,700     |         |  |   | 9,700     |  |  |       | 8,400    
|Recoverable gold ounces inventory |  |         | 14,100    |  |         |   | 14,500    |         |  |   | 12,700    |  |  |       | 15,500   
|Cash cost of gold sales ($/oz)    |  | $       | 898       |  |         | $ | 920       |         |  | $ | 908       |  |  | $     | 931      



Note: Cash cost of gold production is a
non-GAAP measure and is calculated utilizing Gold Institute Standards.



Cash cost per gold ounce sold is a common
gold mining industry measure and is therefore provided for benchmarking purposes. The measure may be useful as an indication of
the average cash cost per ounce sold; but the measure does not reflect incremental costs or cash expenditures because fixed costs
are included in the calculation and capital spending is ignored by the measure. Under IFRS, there is no standardized definition
of cash cost per gold ounce sold and therefore the measure may not be comparable to similar measures reported by other issuers.
The Company calculates cash cost per gold ounce sold using the Gold Institute Standards, and the measure is calculated by subtracting
depreciation, depletion, amortization, and silver by-product credits from cost of sales. Cost of sales includes all mine-site operating
costs, mine-site overhead, production taxes, royalties, production stripping costs net of capitalization, secondary development
costs, changes in inventory, and mine-site depreciation, amortization, depletion.



26







The following schedule reconciles cost
of sales to cash cost per gold ounce sold for the periods indicated.





|                                                    |  | 2012 |            |   | 2011 |  
|--------------------------------------------------- |  | ---- | ---------- | - | ---- | -
|Total cost of sales                                 |  | $    | 43,580,700 |   |      | $
|Less - mining related depreciation and amortization |  |      | (8,095,100 | ) |      |  
|Less - silver by-product credits                    |  |      | (357,300   | ) |      |  
|Total cash cost of sales                            |  | $    | 35,128,300 |   |      | $
|                                                    |  |      |            |   |      |  
|Ounces sold                                         |  |      | 35,646     |   |      |  
|                                                    |  |      |            |   |      |  
|Total cash cost per ounce                           |  | $    | 985        |   |      | $



Briggs produced $7.2 million in operating
cash flow and $3.8 million of income before tax in the Fourth Quarter 2012. Gold ounces sold in Fourth Quarter 2012 exceeded Third
Quarter 2012 sales by approximately 12 percent. This positive performance was primarily driven by higher gold grades placed on
the leach pad through an upgraded crushing circuit. The volume of ore and waste mined increased by 26 percent in Fourth Quarter
2012 from Third Quarter 2012 due to the need to remove more waste in newer pits. During Fourth Quarter 2012, the last three benches
of the Briggs Main Pit were mined, which lowered ore-mining productivity due to reduced working space in the pit bottom. Operations
in this pit were further impacted by the unusual presence of water, which limited mining rates. During this period, waste stripping
operations were focused on pioneer activities in the upper benches of the Goldtooth South Pit. The principal ore supply in Fourth
Quarter 2012 was the Goldtooth North Pit which has a narrow approach posing a bottleneck limiting ore production. These factors
resulted in a reduction of approximately 6 percent in tons of ore supplied to the crusher, which was offset by approximately a
12 percent increase in the average ore grade, which originated principally from the Goldtooth North Pit. Contained gold ounces
stacked on the leach pad increased by approximately 4 percent relative to Third Quarter 2012. Estimated recoverable gold inventory
in stockpiles, on the heap-leach pad and in the processing plant at year-end 2012 was approximately 16,600 ounces.



The sequencing of stripping operations
continued to impact the availability of ore tonnages in First Quarter 2013. The Company expects the decreased ore production will
be at least partially offset by higher ore grades. As stripping progresses in the Goldtooth South Pit, ore supplies are expected
to increase with continued availability of higher ore grades. Stripping operations have also commenced on the Upper Briggs Main
Pit to bring down another phase of mining, and which will deepen the existing Main Briggs Pit. Pioneering work is also commencing
on the Briggs Main North Pit to insure future ore supplies. In First Quarter 2013 significant maintenance work is being conducted
on Briggs’ fleet of loaders, and a loader has been purchased for the crushing plant to eliminate competition between the
mine and crusher for loader capacity. These actions are expected to increase the availability of the primary loader fleet.



The cash cost of gold per ounce sold increased
in Fourth Quarter 2012 by approximately 2 percent over Third Quarter 2012. While direct operating expenditures at Briggs declined
7 percent in Fourth Quarter 2012, this decline was more than offset by an increase in preproduction stripping and a draw-down of
higher cost gold inventory into cost of sales.



Briggs produced $22.5 million in operating
cash flow and $15.4 million of income before tax in 2012. Gold ounces sold from Briggs increased approximately 10 percent in 2012
over 2011, with a corresponding increase of approximately 15 percent in total revenue. Cost of sales, including depreciation and
amortization, increased approximately 16 percent in 2012, much of the increase resulting from increased volume. The average annual
cash cost per ounce sold increased approximately 8 percent in 2012. This increase in cost was primarily driven by reduced operational
productivity as a result of mechanical issues in the crushing plant during the first half of 2012 (described below), with corresponding
increases in maintenance costs, and by tight mining conditions related to longer ore and waste haul-cycles and lower loader-availabilities
in the second half of the year.



27







The Briggs crushing plant has crushed over
34 million tons of ore in its lifespan. Plant maintenance issues were experienced in the first half of 2012, reducing crushed-ore
placements on the leach pad. Turnaround maintenance was required, which was completed in the second half of 2012 and early 2013.
These activities included replacement of the primary jaw crusher and vibrating feeder, rebuild of the secondary crusher, purchase
of two new tertiary crushers and rebuild of the third, and rebuild of the screening plant and conveyor systems. In late 2012 and
early 2013, additional conveyors were purchased to allow stacking on the upper lifts of the leach pad in the future. This work
has improved the maintenance status of the plant and the Company believes that it will allow for higher operational productivities
in the future as ore supplies are available.



The budgeted waste to ore stripping ratio for Briggs in 2013
is expected to be 3.8 versus an actual stripping ratio of 2.4 in 2012 and 3.7 in 2011. This increased stripping ratio will be combined
with longer haulage cycles. Two new 100-ton haul trucks and one new blast-hole drill have been acquired in early 2013 to accommodate
this increase. Briggs is converting one of the mine’s older 85-ton haul-trucks into a water truck in 2013 and will retire
an existing water truck.



Actions have been taken and other actions
are underway to foster continuous improvement in production and reliability while cutting costs at Briggs. Actions have included
reinforcing business goals with personnel, changes in personnel, revisions to authority levels for expenditures, additional training
in tracking and analysis of costs, and increased attention to planned maintenance programs. Further, the Company is implementing
changes to operating schedules and an active cost-cutting program is being put in place.



Briggs’ production costs on a per-ton-mined
and processed basis are summarized below for the prior two years.





|Briggs Mine Average Operating Cost Per Ton | 
|------------------------------------------ | 
|                                           | 
|Function                                   | 
|Mining                                     | 
|Mining                                     | 
|Crushing                                   | 
|Leach and Plant                            | 
|Site Gen and Admin                         | 
|Total Operating Cost                       | 





Capital additions, inclusive of mine development,
aggregated approximately $5.0 million in 2012. Project and sustaining capital expenditures in 2013 are expected to be between $4.0
million and $4.5 million. The majority of the anticipated capital spending is for mining equipment as previously noted. The capital
additions in 2012 included replacement of the primary jaw crusher and vibrating feeder, rebuild of the secondary crusher, purchase
of two new tertiary crushers and rebuild of the third, rebuild of the screening plant and conveyor systems, and component replacements
on mining units. As of December 31, 2012, the cumulative, recorded cost of Briggs’ property, plant, mine development, and
mineral interests was $51.2 million, having a carrying-value of $25.0 million, net of depreciation and amortization.



28







Mobile equipment at Briggs includes eight
85 to 100-ton trucks, three 15-cubic-yard loaders, three blast-hole drills, four dozers, and two graders. The three-stage crushing
plant at Briggs has a nominal capacity of 600 to 700 tons per hour depending on hardness of ore feed. Ore is typically crushed
in three stages to 80 percent minus-1⁄4-inch-size and conveyor-stacked on the leach pad for leaching. Gold recovery at this
crush size is estimated to be approximately 80 percent. The gold recovery plant utilizes the carbon absorption and desorption process
to recover gold from solution, and the refinery utilizes conventional furnace technology. Power for the mine is currently supplied
by four 1.1 megawatt diesel generators.



Briggs mining operations are planned to
be entirely within the existing permit boundary area. However, an amendment to the existing reclamation plan was required to address
a portion of the mine-area. To accommodate this permit revision, an updated Environmental Assessment was completed and approved
by the BLM on February 1, 2012. Reclamation activities are conducted concurrently with mining operations whenever reasonable. For
example, in areas of new mining, topsoil is being stockpiled for future reclamation work.



Briggs operates under the requirements
of the following significant permits and agencies: (1) Plan of Operations, BLM; (2) Mining and Reclamation Plan, Inyo County; (3)
Waste Discharge Requirements, Lahontan; (4) Permits to Operate, Great Basin Unified Air Pollution Control District; and (5) a stream
bed alteration permit with California Fish and Game. The Company, via sureties, has posted reclamation bonds with these agencies
in the amount of $4.4 million. All surety bonds are subject to annual review and adjustment.



Briggs is hosted by Precambrian quartz-rich
gneiss and amphibolite which have undergone ductile folding during Precambrian time and subsequently subject to brittle deformation
by high and low-angle faulting during Mesozoic and Tertiary time. High-angle faults and shear zones are believed to have acted
as conduits that channeled gold-bearing hydrothermal fluids upwards into the Precambrian gneiss and amphibolites rock units. The
principal gold mineralized high-angle fault zone at the mine is the north-south trending Goldtooth fault. The Goldtooth fault was
developed historically by underground methods in the early 1900s and remains an important source of ore at Briggs.



The table below summarizes the change in
gold reserves in contained ounces at Briggs in 2012.





|                      |  | Beginning |         |  |            |  |         | Other   |  |  | Ending  |  
|--------------------- |  | --------- | ------- |  | ---------- |  | ------- | ------- |  |  | ------- | -
|Contained Ounces      |  | 2012      |         |  | Production |  |         | Changes |  |  | 2012    |  
|Proven                |  |           | 128,788 |  |            |  |         |         |  |  |         |  
|Probable              |  |           | 118,141 |  |            |  |         |         |  |  |         |  
|                      |  |           |         |  |            |  |         |         |  |  |         |  
|Total Briggs Reserves |  |           | 246,929 |  |            |  | (45,978 | )       |  |  | (17,500 | )



Other Changes include the impacts of changes
to mine design and changes in ore mined versus modeled ore in reserve.



29







Detailed proven and probable reserves by
pit area as of December 31, 2012, estimated utilizing a 0.007 oz/ton cutoff grade, are shown in the following table. (See section
D. Property, Plant and Equipment, Summary of Mineral Reserves and Resources for certification.)





|                        |  |             |  | Tons     |       |  | Gold     |  |       | Contained | 
|----------------------- |  | ----------- |  | -------- | ----- |  | -------- |  | ----- | --------- | 
|Mining Area             |  | Category    |  | (x1,000) |       |  | (oz/ton) |  |       | Ounces    | 
|Briggs Main             |  | Proven      |  |          | 2,060 |  |          |  | 0.016 |           | 
|                        |  | Probable    |  |          | 1,793 |  |          |  | 0.015 |           | 
|                        |  | Sub-Total   |  |          | 3,852 |  |          |  | 0.016 |           | 
|Briggs Main North       |  | Proven      |  |          | 992   |  |          |  | 0.018 |           | 
|                        |  | Probable    |  |          | 1,112 |  |          |  | 0.019 |           | 
|                        |  | Sub-Total   |  |          | 2,104 |  |          |  | 0.018 |           | 
|Gold Tooth - North      |  | Proven      |  |          | 158   |  |          |  | 0.042 |           | 
|                        |  | Probable    |  |          | 385   |  |          |  | 0.031 |           | 
|                        |  | Sub-Total   |  |          | 543   |  |          |  | 0.034 |           | 
|Gold Tooth - South      |  | Proven      |  |          | 1,326 |  |          |  | 0.024 |           | 
|                        |  | Probable    |  |          | 1,465 |  |          |  | 0.023 |           | 
|                        |  | Sub-Total   |  |          | 2,791 |  |          |  | 0.024 |           | 
|Total - Briggs Reserves |  | Proven      |  |          | 4,536 |  |          |  | 0.020 |           | 
|                        |  | Probable    |  |          | 4,754 |  |          |  | 0.020 |           | 
|                        |  | Grand Total |  |          | 9,290 |  |          |  | 0.020 |           | 



Pinson Mine Property, Nevada



The Pinson underground mine commenced operations
during development in August of 2012. Pinson underground is expected to attain commercial production levels in 2013. All expenditures
and revenues recognized during the development stage and having a future benefit are capitalized. The Pinson open pit property
is discussed separately in a later section as a development property.



Pinson is located in Humboldt County, Nevada,
about 30 miles east of Winnemucca and is accessed by an all-weather road about ten miles north of the Golconda Exit from Interstate
Highway 80.  The property is located on the Getchell Gold Belt in north-central Nevada near its intersection with the north
end of the Battle Mountain-Eureka trend. Prior to 2000, Pinson produced over 987,000 ounces of gold from oxidized ore by open
pit mining and oxide heap-leach and mill recovery. Gold production came from decalcified, locally silicified and/or argillized,
fine-grained, limy sedimentary rocks of the Ordovician Period Comus Formation and is considered a Carlin-type, sedimentary host
gold system.  Mineralization is focused along and adjacent to the Getchell Fault zone.



In September 2011, Atna completed an Asset
Purchase and Sale Agreement ("APSA") with Pinson Mining Company ("PMC") a subsidiary of Barrick Gold to acquire
PMC’s 70 percent interest in Pinson. The site had previously been operated as a joint venture with PMC owning 70% and Atna
owning 30%. Atna now controls four square miles of land containing the historic Pinson Mine and the related mineral resources.
Atna had originally entered into an Exploration and Development Agreement with PMC at Pinson in 2004 and ultimately earned a 30%
equity interest in the project. The joint venture spent over $50 million on drilling and development work at Pinson from 2004 through
2011.



30







The land now controlled by the Company
contains substantially all of the mineral resources developed by the former joint venture. The land position includes four square
miles of leased and owned fee lands and unpatented mining claims. This includes 30 claims owned 100 percent, ownership of two additional
sections of fee surface and mineral lands, ownership of 41.66 percent of 18 additional claims and a lease interest in 18 full and
two fractional mining claims. The Company owns an additional 41.66 percent interest on an additional 120 acres of fee and mineral
lands and leases the remainder of that interest, with the remainder controlled by local landowners. In total, there are 2,545acres in the Pinson package. The Pinson underground ores are subject to a 6.0% Net Smelter Return ("NSR")
royalty payable to underlying landholders. A NSR royalty is a defined percentage of the gross revenues from a mining operation,
less a proportionate share of incidental transportation, insurance, refining and smelting costs. PMC also retained a 10 percent,
net profits royalty, that is payable after all development expenditures are recaptured and the first 120,000 ounces of gold have
been sold.



31











Mining is by mechanized methods utilizing
underground loaders, trucks, and jumbo drills. The Pinson mine will utilize an underhand cut and fill mining method using cemented
rock fill (“CRF”). This method was chosen due to the variable nature of the various ore bodies and the low strengths
of the ore and country rock. This method is designed to maximize safety and minimize ore dilution, while recovering a high percentage
of ore reserve to maximize economic return. The underhand cut and fill mining method is currently being used in a number of mines
in Nevada where ore and country rock characteristics necessitate a conservative support design to enhance miner safety. Golder
Associates, a globally recognized geotechnical and engineering consulting firm, has been retained to provide geotechnical review
and to evaluate the ground control design in development and ore headings; to review and provide technical guidance on the mixing
and placement of CRF in the stopes; and to provide ongoing ventilation design and support.



32







Pinson ores will be trucked to nearby third
party processing plants for gold recovery. As part of the APSA, Atna entered into a non-exclusive Ore Milling and Gold Purchase
Agreement with an affiliate of PMC allowing Atna, at its option, to process Pinson sulfide ores at Barrick's Goldstrike processing
facilities (“Goldstrike Plant”). This agreement is evergreen through the life of the Pinson underground project. Sulfide
ore will be shipped in lots of 15,000 tons under the contract, equivalent to one day of processing capacity at the Goldstrike Plant.
All gold produced under this Agreement will be sold to Barrick at market-indexed prices. The Goldstrike Plant is approximately
135 miles from Pinson.



An ore sales agreement has been signed
for the sale of oxide ores from Pinson to Newmont's Twin Creek's oxide mill. Under this agreement, ore will be sold, based on a
payable/recoverable gold content basis, to Newmont in 3,000 ton lots, representing the daily capacity of that oxide mill. This
agreement is valid through December of 2013. Newmont’s Twin Creeks plant is approximately eight miles from Pinson. Oxide
ore represents approximately 15% of stated reserves at Pinson, and dependent on sulfide sulfur content, may also be blended into
sulfide ore shipments to other processors.



Mined ore is transported to surface stockpiles.
Once assay data is received, the ore is separated into both oxide and sulfide, high and low grade stockpiles. Once a sufficient
lot size has been accumulated, the ores will be shipped to either the oxide or sulfide mills, depending on ore characteristics.
The rate of production, the batch sizes of the ore shipments, and roughly a 30-day receivable cycle will potentially result in
months elapsing between the ore being mined, ore sales, and cash receipts. This will result periodically in large working capital
balances, building inventory and receivables.



The workings are being de-watered using
two existing wells. Two additional wells have been drilled and the Company is purchasing additional pumps and related equipment
to put these de-watering wells into operation. Water is currently being discharged into two existing rapid infiltration basins
and a third basin is permitted for construction.



Development work at Pinson commenced in
early 2012 and has continued to accelerate. Pinson is expected to transition from development to commercial production in 2013.
During 2012, the Company expended $22.5 million on development of and on property, plant, and equipment for the Pinson Mine, net
of pre-production sales. Major milestones completed to date include the following:



| | · | DMC Mining Services, an underground mining contractor, was mobilized to the site in early 2012
to commence mining operations and the rehabilitation of prior workings.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | The secondary escape-way / access into the mine was completed in June and the spiral decline has
been driven to the 4585 level from the 4770 adit level.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | Major upgrades to underground utilities have been completed including the upgrade and installation
of ventilation systems, compressed air and water lines, communications systems, and electrical distribution and control systems.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | Laterals have been driven into the OG zone on the 4770, 4740, 4650 and 4600 levels and into the
Otto zone at the 4690, 4640 and 4620 levels. A crosscut is currently being driven from the 4620 level to access the Range Front
zone.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | Top-cuts have been completed in the 4650 and 4740 Ogee ("OG") stopes and the first undercuts
are being successfully mined using underhand cut and fill methods.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | 2012 ore production during development totals approximately 7,860 tons, containing approximately
2,370 ounces of gold.
| | - | ----------------------------------------------------------------------------------------------------------------------



33







| | · | Boart-Longyear started underground RC drilling for stope delineation in early October and has been
operating continuously under a long-term contract.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------



| | · | A CRF plant has been built for use in backfilling ore mining areas.
| | - | -------------------------------------------------------------------



| | · | A mobile crushing plant was purchased and is used to crush aggregate for CRF.
| | - | -----------------------------------------------------------------------------



| | · | Power lines have been extended to provide power to additional de-watering wells and the crusher-plant
location. A second dewatering well was commissioned in September, and installation of a third well commenced in February 2013.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | Construction of the assay lab was completed in the fourth quarter. The lab has been commissioned
and the turnaround of assay results is improving.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------



| | · | The construction of a lined, ore stockpile area has been completed and is in operation.
| | - | ---------------------------------------------------------------------------------------



| | · | Two ore shipments totaling 4,957 tons were made to the Newmont’s Twin Creeks oxide mill in
2012. Total revenue from gold sales of $1.4 million was credited against development cost. Oxide ore mill recovery averaged 91
percent.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | Additions to staff and personnel are ongoing to support increased levels of operations and mine
development. Simultaneously, DMC Mining Services, the underground mining contractor is also increasing its personnel levels and
equipment fleet.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Mine development statistics for 2012 are
shown in the following table.





|                         |  | Fourth       |       |  | Third        |  |       | Second       |  |  | First        |  |  |       |            
|------------------------ |  | ------------ | ----- |  | ------------ |  | ----- | ------------ |  |  | ------------ |  |  | ----- | -----------
|Production Statistic     |  | Quarter 2012 |       |  | Quarter 2012 |  |       | Quarter 2012 |  |  | Quarter 2012 |  |  | Total |            
|Oxide tons               |  |              | 3,027 |  |              |  | 454   |              |  |  | 340          |  |  |       | 1,413      
|Oxide grade (opt)        |  |              | 0.215 |  |              |  | 0.455 |              |  |  | 0.381        |  |  |       | 0.333      
|Oxide ore ounces         |  |              | 650   |  |              |  | 207   |              |  |  | 130          |  |  |       | 471        
|Sulfide tons             |  |              | 1,160 |  |              |  | 1,468 |              |  |  | -            |  |  |       | -          
|Sulfide grade (opt)      |  |              | 0.353 |  |              |  | 0.341 |              |  |  | -            |  |  |       | -          
|Sulfide ore ounces       |  |              | 409   |  |              |  | 501   |              |  |  | -            |  |  |       | -          
|Total gold ounces mined  |  |              | 1,059 |  |              |  | 707   |              |  |  | 130          |  |  |       | 471        
|                         |  |              |       |  |              |  |       |              |  |  |              |  |  |       |            
|Payable oxide ounces     |  |              | 438   |  |              |  | -     |              |  |  | 375          |  |  |       | -          
|Payable sulfide ounces   |  |              | -     |  |              |  | -     |              |  |  | -            |  |  |       | -          
|Payable ounces sold      |  |              | 438   |  |              |  | -     |              |  |  | 375          |  |  |       | -          
|                         |  |              |       |  |              |  |       |              |  |  |              |  |  |       |            
|Escapeway (feet)         |  |              | -     |  |              |  | 247   |              |  |  | 765          |  |  |       | 61         
|Spiral (feet)            |  |              | 450   |  |              |  | 366   |              |  |  | -            |  |  |       | -          
|Lateral Development (ft) |  |              | 444   |  |              |  | 428   |              |  |  | -            |  |  |       | -          
|Total Development (ft)   |  |              | 894   |  |              |  | 1,041 |              |  |  | 765          |  |  |       | 61         
|                         |  |              |       |  |              |  |       |              |  |  |              |  |  |       |            
|Active stope areas       |  |              | 2     |  |              |  | 2     |              |  |  | bulk sample  |  |  |       | bulk sample
|Stopes under devel.      |  |              | 3     |  |              |  | 2     |              |  |  | -            |  |  |       | -          



In order to achieve ore production rates
and the appropriate number of ore stopes, capital development activities will continue to be prioritized.  The two main areas
of focus include the Pinson Spiral and the Range Front lateral drive.  The Pinson Spiral is located adjacent to the Ogee ore
zone which is the current production area.  Ground conditions are generally very good but some water has been encountered
which decreased advance rates.  A dewatering plan is currently being designed to address any possible inflow situation. 
The Range Front lateral began in late January and heads through numerous faults and structural features. Advance rates have been
slower through this ground and extra care is needed to maintain a long term drift for primary haulage. This drive will access additional
reserve blocks for production in the second half of 2013.



34







The placement of CRF into the top-cuts
of two ore stoping areas commenced during the fourth quarter with satisfactory results and undercut mining, beneath CRF commenced
in the first quarter 2013, also with satisfactory results. Operations were impacted in late December and early January by extremely
cold weather, before the plants could be fully winterized. These weather related issues caused freezing of pipes and prevented
the mixing of CRF, which slowed the initial ramp-up of operations and resulted in lower than anticipated mine development rates
and ore mining during the first quarter of 2013. Ore production rates at Pinson are expected to increase now that underhand stoping
activities have been established. The Company’s goal for 2013 is to end the year with a total of nine to twelve operating
ore stopes, with additional stopes being continuously developed to replace depleting stopes. Together with underground truck haulage,
the Company believes this number of working faces can achieve a daily production rate in the 750 to 1,000 ton per day range. Ore
production is expected to increase throughout 2013 as additional ore stopes are developed. Based on current forecasts, Pinson is
expected to produce between 50,000 and 57,000 ounces of gold in 2013 at a projected cash cost of between $900 to $950 per ounce,
inclusive of contract mining services, equipment rentals, third-party processing costs, transportation of ore to third-party processors,
all royalties, and severance taxes. The majority of this production is expected to occur in the second half of 2013. Total production
cost including sustaining capital and depreciation is projected to be between $1,025 and $1,180 per ounce.



An intended focus of work at Pinson in
2013 is development of ore grade control systems in an effort to maximize revenues earned under Pinson's third party processing
agreements. Additional focus is being placed on gaining a stronger understanding of ground control requirements, development of
data for validation of reserve models, and stope sequencing and development planning as additional working faces are added. These
actions are importantto success at Pinson.



On February 5th, 2013, Pinson's application
for modification to its Mine Water Pollution Control Permit became effective. This permit approval authorizes Atna to construct
and operate the Pinson Mine and to extract by underground mining up to 400,000 tons of ore per year for offsite processing. The
modification replaces the former Pinson Exploration Project permit which allowed the mining of up to 36,500 tons of ore per year.



On July 20, 2012, the Company received
Notice of Approval of the Class II Air Quality Operating Permit from the Nevada Division of Environmental Protection (“NDEP”).
This permit covers the operation of an ore-crushing facility, a crusher facility for aggregate for backfill, a shotcrete plant,
a backfill plant and an assay laboratory.



Associated with the existing permits is
approximately $2.0 million in reclamation bonding. Atna provided the State of Nevada with approximately $0.8 million of this bonding
to date and expects to provide the balance of approximately $1.2 million in 2013 when the State and Federal agencies complete their
reviews of the bonding requirement.



Gustavson Associates, LLC, an independent
engineering firm, completed the “NI 43-101 Technical Report, Pinson Project, Humboldt County, Nevada” dated May 30,
2012 with an effective date of May 18, 2012 (the “Pinson Report”) prepared by William J. Crowl, R.G., MMSA SME-RM,
and Donald E. Hulse, P.E. each a qualified person as defined in NI 43-101 for the Pinson Underground Gold Mine. The Pinson Report
demonstrates that Pinson is an economically attractive gold mining project. The Pinson Report includes Mineral Resource and Mineral
Reserve estimates, mining and processing plans, detailed project economics and sensitivity analyses. The Pinson Report envisions
a six-year life after the 2012 development period to recover approximately 550,000 ounces of gold at an average rate of approximately
90,000 ounces per year from current Proven and Probable Mineral Reserves. This projection does not include possible conversion
of Inferred Mineral Resource into Mineral Reserve or any additional contribution from the adjacent potential open pit project.



35







Project economics from the Pinson Report
at varying gold prices are demonstrated in the following table.



|Gold Price                |  |           |  | $ | 1,300 |   |  | $ | 1,500 |   |  | $ | 1,700 |  
|------------------------- |  | --------- |  | - | ----- | - |  | - | ----- | - |  | - | ----- | -
|IRR                       |  |           |  |   | 103   | % |  |   | 171   | % |  |   | 239   | %
|NPV 10% (Million)         |  | (Million) |  | $ | 72    |   |  | $ | 129   |   |  | $ | 185   |  
|Payback (Years)           |  | (Years)   |  |   | 2.2   |   |  |   | 1.6   |   |  |   | 1.4   |  
|Cash Operating Cost (C1)* |  | ($/oz)    |  |   | 829   |   |  |   | 829   |   |  |   | 829   |  
|Total Cash Cost (C2) *    |  | ($/oz)    |  |   | 935   |   |  |   | 972   |   |  |   | 1,010 |  
|Full Cost (C3)*           |  | ($/oz)    |  |   | 1,067 |   |  |   | 1,104 |   |  |   | 1,142 |  



*Gold Institute Cost Standards:

C1: Total direct costs of production

C2: C1 plus royalty payments
and Nevada severance tax

C3: C2 plus depletion, depreciation,
and the amortization of capital costs



Mineral Reserves for Pinson were estimated
in the May 2012 NI43-101 compliant technical report using a 0.20 oz/ton cutoff grade. Due to the minor amount of reserve mined
in 2012 the only modification to reserve since May 2012 is the small amount of ore mined during development.



The change in reserve due to mining in
2012 is shown in the following table:





|                      |  | May 18, |         |  |            |  |        | Other   |  |  | Ending | 
|--------------------- |  | ------- | ------- |  | ---------- |  | ------ | ------- |  |  | ------ | 
|Contained Ounces      |  | 2012    |         |  | Production |  |        | Changes |  |  | 2012   | 
|Proven                |  |         | 370,100 |  |            |  | (2,364 | )       |  |  |        | 
|Probable              |  |         | 274,500 |  |            |  |        |         |  |  |        | 
|                      |  |         |         |  |            |  |        |         |  |  |        | 
|Total Pinson Reserves |  |         | 644,600 |  |            |  | (2,364 | )       |  |  | 0      | 



"Other Changes" include the impact
of reserve estimation of changes in the three year trailing price of gold, changes in operating costs and changes due to the addition
of new drilling information.



Ore reserves
remaining at Pinson as of December 31, 2012, estimated using a 0.20 oz/ton cutoff grade are as follows(See section D. Property,
Plant and Equipment, Summary of Mineral Reserves and Resources for certification.).



36









|                        |  |             |  | Tons     |           |  | Gold     |  |       | Contained | 
|----------------------- |  | ----------- |  | -------- | --------- |  | -------- |  | ----- | --------- | 
|Mining Area             |  | Category    |  | (x1,000) |           |  | (oz/ton) |  |       | Ounces    | 
|Ogee Zone               |  | Proven      |  |          | 305,438   |  |          |  | 0.412 |           | 
|                        |  | Probable    |  |          | 283,400   |  |          |  | 0.343 |           | 
|                        |  | Sub-Total   |  |          | 588,838   |  |          |  | 0.379 |           | 
|Line Hole               |  | Proven      |  |          | -         |  |          |  | -     |           | 
|                        |  | Probable    |  |          | 112,200   |  |          |  | 0.544 |           | 
|                        |  | Sub-Total   |  |          | 112,200   |  |          |  | 0.544 |           | 
|Range Front             |  | Proven      |  |          | 286,900   |  |          |  | 0.338 |           | 
|                        |  | Probable    |  |          | 257,400   |  |          |  | 0.343 |           | 
|                        |  | Sub-Total   |  |          | 544,300   |  |          |  | 0.340 |           | 
|Adams Peak              |  | Proven      |  |          | 273,800   |  |          |  | 0.341 |           | 
|                        |  | Probable    |  |          | 39,400    |  |          |  | 0.299 |           | 
|                        |  | Sub-Total   |  |          | 313,200   |  |          |  | 0.336 |           | 
|CX Zone                 |  | Proven      |  |          | 136,600   |  |          |  | 0.378 |           | 
|                        |  | Probable    |  |          | 43,600    |  |          |  | 0.372 |           | 
|                        |  | Sub-Total   |  |          | 180,200   |  |          |  | 0.376 |           | 
|Total - Pinson Reserves |  | Proven      |  |          | 1,002,738 |  |          |  | 0.367 |           | 
|                        |  | Probable    |  |          | 736,000   |  |          |  | 0.373 |           | 
|                        |  | Grand Total |  |          | 1,738,738 |  |          |  | 0.369 |           | 



DEVELOPMENT PROPERTIES



Pinson Open Pit Project, Nevada



The Pinson mine had previously operated
as an open-pit mine with gold produced from oxide ores through heap-leach and oxide mill recovery. Between 2004 and 2011, the Pinson
joint venture conducted substantial drilling from surface in and around the existing open pits providing new information and expanding
the mineral resource base in and around the old pits. The Company has evaluated this potential, which resulted in the development
of a substantial measured and indicated mineral resource containing 981,700 gold ounces that the Company believes to be amenable
to open-pit mining and heap-leach gold recovery. This resource is adjacent to but separate from the underground resource.



The Company has initiated a feasibility
study to determine the economic feasibility of developing the section 33 pit, which resides on private property. Engineering work
on this project commenced in January 2013. A second goal of this study is to develop information needed to produce a Mine Plan
of Operations to be submitted to the NDEP to commence the permitting process. This project is currently unpermitted and will be
subject to the permitting process prior to the commencement of mining.



A metallurgical-sample drilling program
in the Mag open pit was completed in May, 2012. A total of four PQ core holes were drilled totaling 2,086 feet to acquire samples
for column leach testing of the potential open-pit, heap-leach gold resources in the Mag pit. Column leach testing was the focus
of the metallurgical work with attention to crush-size optimization, gold recovery optimization, evaluation of reagent costs, and
the evaluation of any recovery issues associated with carbon or gold encapsulation. Drill cores from this program were delivered
to a reputable third-party lab, and assaying and setting-up the test programs continues in 2013. Initial bottle roll test work
has been completed and the data from this work is being utilized to design column leach test parameters.



37







Reward Mine, Nevada



Reward is located on approximately 2,214
acres in southwestern Nye County, Nevada, about 5.5 miles south-southeast of the town of Beatty. Access is gained via state highway
95 to the site access road turnoff followed by a two-mile gravel access road. The Company holds eight placer claims and 14 unpatented
lode claims under four mining leases, which expire in 2024 and 2025. The Company also owns 99 unpatented claims and six patented
claims. The leases and patented claims each carry a 3 percent NSR royalty. No modern commercial mining activities have been undertaken
previously at Reward; it is a ‘green-field’ project which the Company believes it can develop with a comparatively
low capital investment relative to many other properties.











38







Upon completion of the planned construction
activities, Reward will be a conventional open-pit mining operation with ore crushing and heap-leach gold recovery. Mining operations
at Reward will utilize conventional 100-ton open pit trucks and 15-yard loaders. Mined ore will be crushed to minus 3/8 inch and
placed on a lined pad for leaching and gold recovery. Target gold recovery is 80 percent for the project. Process solutions will
be captured in solution tanks and circulated through activated carbon to capture entrained gold. A recent trade-off study recommends
the processing of loaded carbon at Reward versus transport for processing at either Briggs in Inyo County, California, or at a
third party processing facility.



In July 2012, the Company announced the
results of the “NI 43-101 Technical Report, Reward Gold Project, Nye County, Nevada” dated June 29, 2012 with an effective
date of December 31, 2011 (the “Reward Report”) prepared by Fred Barnard, Ph.D, AIPG-CM, Greg Chlumsky, MMSA, Michael
J. Read, SME-RM, Matthew P. Reilly, P.E. and Robert L. Sandefur, P.E. of Chlumsky, Armbrust & Meyer LLC, an independent engineering
firm. Each of the foregoing persons is an independent qualified person in accordance with NI 43-101. Atna contracted with Chlumsky,
Armbrust, & Meyer LLC of Lakewood, Colorado, to prepare the Reward Report in order to consolidate information in relation to
the mineral resource estimate, mineral reserve estimate and update the feasibility information for Reward. Projected project economics
at varying gold prices are shown in the following table.



|Gold Price              |  | $ | 1,200 |   |  | $ | 1,300 |   |  | $ | 1,400 |   |  | $ | 1,500 |   |  | $ | 1,600 |  
|----------------------- |  | - | ----- | - |  | - | ----- | - |  | - | ----- | - |  | - | ----- | - |  | - | ----- | -
|                        |  |   |       |   |  |   |       |   |  |   |       |   |  |   |       |   |  |   |       |  
|Cash Flow (US $Million) |  | $ | 75.0  |   |  | $ | 94.6  |   |  | $ | 114.2 |   |  | $ | 133.8 |   |  | $ | 153.5 |  
|NPV @5% (US $Million)   |  | $ | 52.8  |   |  | $ | 68.6  |   |  | $ | 84.4  |   |  | $ | 100.2 |   |  | $ | 116.0 |  
|IRR                     |  |   | 38.4  | % |  |   | 48.0  | % |  |   | 57.5  | % |  |   | 66.9  | % |  |   | 76.1  | %
|Payback (Years)         |  |   | 2.6   |   |  |   | 2.2   |   |  |   | 2.1   |   |  |   | 2.0   |   |  |   | 1.9   |  
|                        |  |   |       |   |  |   |       |   |  |   |       |   |  |   |       |   |  |   |       |  
|C2-Cash Cost* (US $/oz) |  | $ | 569   |   |  | $ | 576   |   |  | $ | 584   |   |  | $ | 592   |   |  | $ | 600   |  
|C3-Full Cost** (US$/oz) |  | $ | 847   |   |  | $ | 855   |   |  | $ | 863   |   |  | $ | 871   |   |  | $ | 878   |  

* C2 cash cost includes all direct operating
costs, royalties and severance taxes

** C3, full cost, includes C2 costs plus
capital cost recovery



Reward Report Highlights(M=million)



Mine Production Rate: 6,500 ore tons per
day

Mine Life: seven years

Average Gold Recovery: 80% (60% in first
two months)

Crush Size: 80% passing 1/2 inch

Life of Mine Strip Ratio: 3.1:1 (waste:
ore)

Initial Capital Cost: $34.5M (including
$5.5M in capital leases and $2.2M in contingency)

Phase 2 Expansion Capital: $6.9M (including
$1.2M bond collateral)

Underlying NSR royalty: 3.0%

Average Annual Gold Production: 35,000
ounces



Planned start-up capital costs total $34.5
million for crushing and process plants, facilities and infrastructure, mobile mining fleet, capitalized stripping and funding
of surety bonds; however this is likely to increase by the time the development occurs. Offsite infrastructure development requirements
for the project have been completed. The production water well, wildlife exclusion fencing, electrical power lines, and road improvements
were completed in 2011. Capital expended at Reward in 2012 totaled $0.1 million. Reward’s carrying cost as of December 31,
2012 was $10.8 million, net of accumulated depreciation.



39







Phase 1 development bonds have been posted
and substantially all permits required for mine development and operating activities have been received. During 2009, work was
completed on an Environmental Assessment for Reward. The US Bureau of Land Management signed the Record of Decision and Finding
of No Significant Impact to approve development of Reward in August 2009. In January 2010, the Nevada Division of Environmental
Protection issued a Reclamation Permit that became effective February 7, 2010. This permit, subject to the placement of a total
of $5.9 million in reclamation bonds, will allow Atna to construct the Reward Mine. Approximately $0.9 million of the bonding is
in place, and the balance is expected to be placed prior to commencing final construction. Reclamation bonds may be subject to
inflation and other adjustments. Other major permits, including the Class II Air Quality Operating Permit, Water Pollution Control
Permit, and a Permit to Change Point of Diversion, Manner of Use and Place of Use of The Public Waters, have also been issued by
the State of Nevada.



The Company expects to commence construction
of the Reward mine once Pinson has achieved positive cash flow and the cash generated from both Briggs and Pinson has first been
used to strengthen Atna's balance sheet. This strategy will provide the opportunity for funding the sequential development of Reward
in a measured and controlled manner. Once commenced, a nine-month construction period is anticipated; with gold production commencing
three months after construction is completed.



Current reserve estimates are based on
estimated future costs and the prior three-year average gold price of $1,490 as of December 31, 2012, supported by an NI 43-101
compliant report dated 29 June 2012. Reserves assume an 80 percent processing recovery rate based on metallurgical test results.
The Reward operation is expected to produce approximately 215,000 ounces of recovered gold over a seven-year mine life. The life
of mine waste-to-ore strip ratio is expected to be 2.9.





|                       |  | Tons     |        |  | Gold     |  |       | Contained | 
|---------------------- |  | -------- | ------ |  | -------- |  | ----- | --------- | 
|Category               |  | (x1,000) |        |  | (oz/ton) |  |       | Ounces    | 
|Measured               |  |          | 4,692  |  |          |  | 0.023 |           | 
|Indicated              |  |          | 13,363 |  |          |  | 0.019 |           | 
|                       |  |          |        |  |          |  |       |           | 
|Measured and Indicated |  |          | 18,055 |  |          |  | 0.020 |           | 
|                       |  |          |        |  |          |  |       |           | 
|Inferred               |  |          | 4,757  |  |          |  | 0.014 |           | 



Gold mineralization at Reward is controlled
principally by the Good Hope fault zone; a sheeted, steeply dipping, north-south-trending quartz-vein zone. Adjacent to the Good
Hope fault, the phyllitic quartzite, siltstone, and shales dip moderately to the east (45 degrees) and are host to more disseminated
gold mineralization associated with narrow iron oxide veinlets (after pyrite) and minor quartz veining. The Reward gold deposit
has been sampled by 339 holes totaling more than 125,000 feet drilled by a number of mining entities over the past 15 years including
the Company. Gold mineralization has been encountered over a strike length of more than 2,400 feet and to a depth of 700 feet along
the Reward structure. The width of mineralization within the structural zone ranges from a few feet to up to 200 feet and the bedded
zones along the southeastern flank of the main Reward deposit attains thicknesses in excess of 300 feet. Mineralization in the
Good Hope structure and the bedded zones along the southeastern margins of the deposit remains open at depth and along strike to
the south. To date, other than exploration and development drilling, no mining operations have been conducted at Reward.



During the first quarter of 2013, the Company
began a limited exploration and development drill program to continue to evaluate the southern and southeastern margins of the
main Reward gold deposit. This drilling continues to find extensions of the known zones of mineralization, but the drill-hole penetrations
are not sufficiently dense to produce expansions of either the reserves or resources at the current time. Additional drilling will
be required to move these promising extensions into either reserves or resources, although the Company provides no assurances that
such reclassification can or will be achieved. Gold resources at Reward therefore have not been updated since the Reward Report
dated June 29, 2012 with an effective date of December 31, 2011.



40









Detailed Drill Results – Q1-2013
Drill Program

|                               |  | From-feet(meters) |  | To-feet(meters) |  | Length-feet(meters) |  | *True Thickness-
        feet (meters) |  | ounces/ton Au
        (grams/tonne
        Au)
|------------------------------ |  | ----------------- |  | --------------- |  | ------------------- |  | -------------------------------------- |  | ----------------------------------------------
|RW13-039(Azimuth 0, Angle -90) |  |                   |  |                 |  |                     |  |                                        |  |                                               
|                               |  | 225 (68.6)        |  | 310 (94.5)      |  | 85 (25.9)           |  | 36 (11.0)                              |  | 0.016 (0.54)                                  
|RW13-040(Azimuth 0, Angle -90) |  |                   |  |                 |  |                     |  |                                        |  |                                               
|                               |  | 420 (128.0)       |  | 505 (153.9)     |  | 85 (25.9)           |  | 61 (18.6)                              |  | 0.017 (0.57)                                  
|RW13-041(Azimuth 0, Angle -90) |  |                   |  |                 |  |                     |  |                                        |  |                                               
|                               |  | 75 (22.9)         |  | 100 (30.5)      |  | 25 (7.6)            |  | 20 (6.1)                               |  | 0.028 (0.95)                                  
|                               |  | 245 (74.7)        |  | 255 (77.7)      |  | 10 (3.0)            |  | 8 (2.4)                                |  | 0.014 (0.43)                                  
|RW13-044(Azimuth 0, Angle -90) |  |                   |  |                 |  |                     |  |                                        |  |                                               
|                               |  | 130 (39.6)        |  | 310 (94.5)      |  | 180 (54.9)          |  | 175 (53.3)                             |  | 0.022 (0.74)                                  
|including                      |  | 215 (65.5)        |  | 310 (94.5)      |  | 95 (29.0)           |  | 83 (25.3)                              |  | 0.029 (0.98)                                  
|RW13-046(Azimuth 0, Angle -90) |  |                   |  |                 |  |                     |  |                                        |  |                                               
|                               |  | 340 (103.6)       |  | 355 (108.2)     |  | 15 (4.6)            |  | 14 (4.3)                               |  | 0.024 (0.81)                                  
|                               |  | 395 (120.4)       |  | 740 (225.6)     |  | 345 (105.2)         |  | 320 (97.5)                             |  | 0.022 (0.76)                                  
|including                      |  | 400 (121.9)       |  | 420 (128.0)     |  | 20 (6.1)            |  | 18.5 (5.6)                             |  | 0.059 (2.02)                                  
|including                      |  | 570 (173.7)       |  | 670 (204.2)     |  | 100 (30.5)          |  | 93 (28.3)                              |  | 0.030 (1.01)                                  
|RW13-048(Azimuth 0, Angle -90) |  |                   |  |                 |  |                     |  |                                        |  |                                               
|                               |  | 345 (105.2)       |  | 530 (161.5)     |  | 185 (56.4)          |  | 170.5 (52.0)                           |  | 0.025 (0.84)                                  



* True thickness is an estimated value based upon interpreted
strike and dip of the mineralized zone and drill hole intercept orientation through the mineralization. The actual thickness may
be less than or greater than the estimated value given in the table if geologic interpretation changes with increased drill hole
density.



Columbia Project, Montana



The Company
wholly-owns or leases 24 patented and 162 unpatented mining claims at Columbia, which is located approximately seven miles east
of Lincoln and 45 miles northwest of Helena, in Lewis and Clark County, Montana. Total acreage is 3,697 acres. Access to the properties
is by dirt roads from a paved highway that crosses near the property. The patented claims are subject to NSR royalties that
range from zero to six percent. Columbia is a ‘green-field’ site, subject only to minor historic mining, and not previously
having operated as a commercial modern mine.



The Company engaged Gustavson Associates,
LLC, an independent engineering to complete the “NI 43-101 Technical Report and Preliminary Assessment on the Columbia Project,
Lewis and Clark County, Montana” dated June 2, 2010 (the “Columbia PEA”) prepared by William J. Crowl R.G., MMSA
SME-RM, Donald Hulse P.E., and Richard Moritz, MMSA of Gustavson Associates, LLC. Each of the foregoing persons is an independent
qualified person in accordance with NI 43-101. Results of the Columbia PEA demonstrate that the project may have favorable development
potential. The preliminary assessment includes inferred mineral resources within the pit boundary that are considered too speculative
geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves,
and there is no certainty that the preliminary assessment estimates will be realized. Additional studies are required to fully
demonstrate the future economic feasibility of the project. This work however justifies moving ahead with a feasibility level study
to further define the economics of the project and justify commencing the permitting process.



41







The Columbia resource estimate is based
on 337 drill holes totaling 147,000 feet of drilling and 12,500 feet of surface trenching in 78 trenches carried out between 1989
and 1993. Bulk sampling, development studies, metallurgical testing, and environmental baseline studies were conducted during the
same time period. The deposit remains open for possible extension both along strike and to depth.









42







The Columbia mineral resource estimate
is summarized in the following table utilizing a cut-off gold grade of 0.02 oz/ton, which is calculated utilizing operating cost
and expected recovery parameters as developed in the Columbia PEA with supporting metallurgical test work.





|                       |  | Tons     |        |  | Gold     |  |       | Contained |  |  | Silver   |  |  | Contained  |      
|---------------------- |  | -------- | ------ |  | -------- |  | ----- | --------- |  |  | -------- |  |  | ---------- | -----
|Category               |  | (x1,000) |        |  | (oz/ton) |  |       | Gold Ozs  |  |  | (oz/ton) |  |  | Silver Ozs |      
|Measured               |  |          | 5,370  |  |          |  | 0.047 |           |  |  | 254,400  |  |  |            | 0.155
|Indicated              |  |          | 11,294 |  |          |  | 0.043 |           |  |  | 487,300  |  |  |            | 0.116
|                       |  |          |        |  |          |  |       |           |  |  |          |  |  |            |      
|Measured and Indicated |  |          | 16,664 |  |          |  | 0.045 |           |  |  | 741,700  |  |  |            | 0.128
|                       |  |          |        |  |          |  |       |           |  |  |          |  |  |            |      
|Inferred               |  |          | 10,705 |  |          |  | 0.042 |           |  |  | 453,600  |  |  |            | 0.097



Columbia PEA Highlights:



| | · | Projected average annual production of approximately 70,000 ounces of gold and 96,000 ounces of
silver over a nine-year mine life at an estimated cash cost of $639 per ounce of gold, net of by-product credits.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Pre-tax discounted net present value at $1,025 per ounce of gold and $16.60 per ounce of silver
of $111.5 million at discount rate of five percent, yielding an internal rate of return of 27 percent.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Estimated capital expenditures of $72.2 million and a payback of 3.3 years.
| | - | ---------------------------------------------------------------------------



The economic results of the Columbia PEA
are dated, , having been prepared in 2010, and both capital and operating costs are subject to change due to inflation of costs
over time. The Columbia PEA contemplates a conventional open pit truck/loader mining operation with sequential pit waste backfill
and a conventional 5,000 ton per day gravity and flotation mill to produce both doré and a gold and silver concentrate.
Concentrates would be sold to third party processing facilities. The initial design seeks to minimize environmental impact by incorporating
dry tailings for pit backfill versus a conventional wet tailings dam.



The Columbia PEA developed a number of
recommendations for future work. These include:



| | · | Additional metallurgical sampling to adequately test the various parts of the resource sufficiently
to refine the process flow and complete a plant design.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Additional drilling to confirm the resource and upgrade the ore classification of the Donnely South
area.
| | - | ---------------------------------------------------------------------------------------------------------

| | · | An evaluation of the permitting requirements of the project.
| | - | ------------------------------------------------------------

| | · | A geotechnical study to optimize pit slope angles and confirm waste dump stability and design.
| | - | ----------------------------------------------------------------------------------------------

| | · | Feasibility and project optimization studies.
| | - | ---------------------------------------------



A second round of metallurgical test work
was completed in February 2012. This work was focused on optimizing flotation gold recovery and characterizing gold concentrate
grade and quality. This program focused on utilizing conventional gravity and flotation gold recovery methods to produce concentrate
products. Both rougher and cleaner floatation circuits were utilized. Reverse circulation reject samples were composited to create
representative oxide mineral samples for testing. Overall recovery was approximately 88 percent for gold and 50 percent for silver.
Cleaner flotation upgraded the flotation concentrate to the range of 39 ounces per ton of gold and 125 ounces of silver. Cyanide
leach test on flotation concentrate produced a gold recovery of 98 percent and a silver recovery of 96 percent, indicating a high
level of oxidation.



43







During the Third Quarter 2012, the Company
completed seven reverse circulation rotary holes drilled to obtain metallurgical samples for additional process optimization studies.
Total footage drilled was 3,468 feet (1,057 m). Holes in this program were drilled down the structural zones to obtain large quantities
of mineralized sample material and the intercept lengths do not represent true thicknesses. The long, down-structure intercepts
provide strong support for the down-dip continuity of the gold and silver grades in both the Columbia and Donnely vein systems
and provide additional support for the resource estimate detailed in the Columbia PEA.



All of the holes drilled in this program
encountered mineralized intercepts over potentially minable intervals along the strike and down the dip of the Columbia and Donnely
vein systems.



Detailed Drill Results:



|Drill Hole            |  | From-feet(meters) |  | To-feet(meters) |  | Length-feet(meters) |  | oz/ton Au(grams/tonne Au) |  | oz/ton Ag(grams/tonne Ag)
|--------------------- |  | ----------------- |  | --------------- |  | ------------------- |  | ------------------------- |  | -------------------------
|COL12-001             |  | 0 (0)             |  | 190 (57.9)      |  | 190 ( 57.9)         |  | 0.067 (2.3)               |  | 0.423 (14.5)             
|including             |  | 15 (4.6)          |  | 95 (29.0)       |  | 80 (24.4)           |  | 0.123 (4.2)               |  | 0.807 (27.7)             
|                      |  | 220 (67.1)        |  | 240 (73.1)      |  | 20 (6.1)            |  | 0.014 (0.5)               |  | 0.091 (3.1)              
|                      |  | 410 (125.0)       |  | 435 (132.6)     |  | 25 (7.6)            |  | 0.020 (0.7)               |  | 0.066 (2.3)              
|                      |  |                   |  |                 |  |                     |  |                           |  |                          
|COL12-002             |  | 0 (0)             |  | 305 (93.0)      |  | 305 (93.0)          |  | 0.074 (2.5)               |  | 0.619 (21.2)             
|including             |  | 50 (15.2)         |  | 90 (27.4)       |  | 40 (12.2)           |  | 0.173 (5.9)               |  | 0.195 (6.7)              
|including             |  | 145 (44.2)        |  | 160 (48.8)      |  | 15 (4.6)            |  | 0.131 (4.5)               |  | 0.253 (8.7)              
|including             |  | 205 (62.5)        |  | 250 (76.2)      |  | 45 (13.7)           |  | 0.201 (6.9)               |  | 2.847 (97.6)             
|                      |  | 335 (102.1)       |  | 500 (152.4)     |  | 165 (50.3)          |  | 0.029 (1.0)               |  | 0.259 (8.9)              
|                      |  |                   |  |                 |  |                     |  |                           |  |                          
|COL12-003             |  | 140 (42.7)        |  | 310 (94.5)      |  | 170 (51.8)          |  | 0.084 (2.9)               |  | 0.340 (11.7)             
|including             |  | 185 (56.4)        |  | 210 (64.0)      |  | 20 (6.1)            |  | 0.205 (7.0)               |  | 1.392 (47.7)             
|including             |  | 255 (77.7)        |  | 300 (91.4)      |  | 45 (13.7)           |  | 0.135 (4.6)               |  | 0.271 (9.3)              
|                      |  | 350 (106.7)       |  | 435 (132.6)     |  | 85 (25.9)           |  | 0.024 (0.8)               |  | 0.039 (1.3)              
|                      |  | 450 (137.2)       |  | 485 (147.8)     |  | 35 (10.7)           |  | 0.011 (0.4)               |  | 0.024 (0.8)              
|                      |  | 495 (150.9)       |  | 630 (192.0)     |  | 135 (41.1)          |  | 0.039 (1.3)               |  | 0.130 (4.5)              
|                      |  |                   |  |                 |  |                     |  |                           |  |                          
|COL12-004             |  | 115 (35.1)        |  | 205 (62.5)      |  | 90 (27.4)           |  | 0.033 (1.1)               |  | 0.146 (5.0)              
|                      |  | 290 (88.4)        |  | 320 (97.5)      |  | 30 (9.1)            |  | 0.028 (1.0)               |  | 0.109 (3.7)              
|                      |  |                   |  |                 |  |                     |  |                           |  |                          
|COL12-005             |  | 65 (19.8)         |  | 520 (158.5)     |  | 455 (138.7)         |  | 0.033 (1.1)               |  | 0.103 (3.5)              
|including             |  | 325 (99.1)        |  | 360 (109.7)     |  | 35 (10.7)           |  | 0.059 (2.0)               |  | 0.087 (3.0)              
|including             |  | 385 (117.3)       |  | 520 (158.5)     |  | 135 (41.1)          |  | 0.061 (2.1)               |  | 0.191 (6.5)              
|                      |  |                   |  |                 |  |                     |  |                           |  |                          
|COL12-006             |  | 35 (10.7)         |  | 70 (21.3)       |  | 35 (10.7)           |  | 0.035 (1.2)               |  | 0.165 (5.7)              
|                      |  | 95 (29.0)         |  | 125 (38.1)      |  | 30 (9.1)            |  | 0.023 (0.8)               |  | 0.034 (1.2)              
|                      |  | 150 (45.7)        |  | 200 (61.0)      |  | 50 (15.2)           |  | 0.020 (0.7)               |  | 0.087 (3.0)              
|Hole lost in workings |  | 235 (71.6)        |  | 288 (87.8)      |  | 53 (16.2)           |  | 0.020 (0.7)               |  | 0.244 (8.4)              
|                      |  |                   |  |                 |  |                     |  |                           |  |                          
|COL12-017             |  | 340 (103.6)       |  | 400 (121.9)     |  | 60 (18.3)           |  | 0.014 (0.5)               |  | 0.373 (12.8)             



* Intercept length may not represent true
thicknesses of the mineralized body due to oblique intersection of the mineralized zone by the drill-hole.



Additional metallurgical test work will
be conducted utilizing samples from this drilling program to further support the currently selected flotation and gravity gold
recovery process. Atna's goal is to continue to develop base data to support the completion over the next year of a Mine Plan of
Operations as a basis to commence the permitting process at Columbia.



44







In addition to drilling, the Company continues
to gather environmental baseline data. Monitoring of water resources has been conducted at the Project since the 1990s and has
yielded an extensive water quality database. The program was expanded in 2012 with the addition of eight groundwater piezometers
and a geomorphic survey of stream reaches. The collected groundwater information will support evaluation of mine water issues such
as water supply and dewatering needs. The geomorphic survey is the initial step in characterizing aquatic habitat in the area.
The environmental program was also expanded to include terrestrial resources including wildlife, vegetation and wetlands. Monitoring
included surveys for threatened, endangered, or sensitive species. These investigations will continue through the 2013 field season.



Gold mineralization at Columbia is considered
a Tertiary-age, low-sulfidation, epithermal volcanic-hosted quartz-adularia vein system. Mineralization is associated with two
high-angle fault zones which host the two principal vein and stockwork vein zones known as the Columbia and Donnely veins. The
veins are exposed on the surface for over 7,000 feet (2,100 m) in a north-south direction and have been explored to a depth of
over 500 feet (150 m) vertically. Gold and silver mineralization is accompanied by broad zones of argillic to propylitic alteration
of the dominantly mafic volcanic flows which host the deposit.



Columbia is not currently permitted for
development. Management’s goal is to collect sufficient baseline data to commence a feasibility study and a “Mine Plan
of Operations” in 2013. Submission of this work will initiate the formal, multi-year permitting process at Columbia. Columbia
is located on patented and unpatented mining claims within a US National Forest. As with all mining projects, an environmental
impact statement and permitting process must be completed before a mine can be developed on the property. There are no assurances
that all needed permits will be issued, issued timely, or issued without onerous conditions.



Briggs Satellite Projects, California



Cecil R is located four miles north of
Briggs. The Company completed an initial NI 43-101 compliant mineral resource estimate and technical report titled “NI 43-101
Technical Report Mineral Resource Estimate Cecil R Gold Deposit, Inyo County, California USA” dated March 2, 2010 (the “Cecil
Report”) prepared by Fred Barnard, Ph.D and Robert L. Sandefur, P.E. of Chlumsky, Armbrust & Meyer LLC. Each of the foregoing
persons is an independent qualified person in accordance with NI 43-101. The following table displays the mineral resource estimate
using a cutoff grade of 0.01 oz/ton. This cutoff grade is higher than the cutoff grade utilized at Briggs to account for potentially
increased ore haulage costs at Cecil R.





|                       |  | Tons     |       |  | Gold     |  |       | Contained | 
|---------------------- |  | -------- | ----- |  | -------- |  | ----- | --------- | 
|Category               |  | (x1,000) |       |  | (oz/ton) |  |       | Ounces    | 
|Measured               |  |          | 858   |  |          |  | 0.024 |           | 
|Indicated              |  |          | 2,382 |  |          |  | 0.022 |           | 
|                       |  |          |       |  |          |  |       |           | 
|Measured and Indicated |  |          | 3,240 |  |          |  | 0.023 |           | 
|                       |  |          |       |  |          |  |       |           | 
|Inferred               |  |          | 5,144 |  |          |  | 0.019 |           | 





Work at Cecil R leading up to the NI 43-101
resource estimate included over 94 drill holes, surface geologic mapping, surface and underground sampling, and 3D geologic modeling.
Gold mineralization at Cecil R is hosted by the same geologic unit which hosts the nearby Briggs gold deposit. The gently west
dipping blanket-like zone of gold mineralization dips beneath Quaternary gravel cover and is distributed over an area 1,500 feet
by 1,200 feet and has a thickness of 10 to 60 feet.



45







In late 2012, a scoping level economic
study was commenced on the Cecil R project. This non-NI 43-101 compliant report produced positive results, and the Company believes
this justifies continued work on the project. Additional work will be planned as financing becomes available. The Cecil R open-pit
project may be required to comply with the California Backfill Regulation. However, certain California statutes and regulations
recognize that under certain circumstances, existing permit areas may be extended to incorporate mining locations necessary for
the continued operation or expansion of the existing operation without the backfilling requirement. Further study and legal review
will be required to fully assess the impact of these regulations on the Cecil R project.



In 2006, Atna acquired Suitcase and Mineral
Hill for 10,000 shares of common stock of Atna. Suitcase and Mineral Hill are located east and upslope from Cecil R and Jackson.
In addition, Atna will pay a total of $135,000 in ten yearly installments, plus a 3 percent NSR royalty that may be reduced to
1 percent for $0.5 million per point of reduction.







Both Suitcase and Mineral Hill have been
actively explored by a number of mining companies since the early 1980s. In 1990, Pegasus Gold Corp conducted detailed helicopter
supported exploration work, including an 8,033 foot drilling program at the properties. Cimarron Resources completed a 3,625 foot
drill program at Suitcase in 1997. These programs confirmed both areas as having significant quantities of gold mineralization.
Most holes averaged only 100 to 200 feet in vertical depth and the deeper potential of both properties, particularly Mineral Hill
with its steep structural controls on gold mineralization, remains to be tested.



None of the Jackson, Suitcase or Mineral
Hill deposits are permitted for operation. Permitting will be required before any operation may be contemplated.



EXPLORATION PROPERTIES



Clover, Nevada



The Clover gold exploration property (“Clover”)
is situated approximately 42 miles (67.5 kilometers) northeast of Winnemucca in Elko County, north-central Nevada, and consists
of 365 unpatented lode claims covering approximately 2,000 acres (810 hectares). Access is via all-weather gravel roads off Nevada
State Route 18 and accessed from Interstate 80 at the Golconda exit. Under an agreement dated March 11, 2003, the Company acquired
a 100 percent interest in 22 claims on Clover, subject to a three percent NSR royalty. The Company optioned the property to
Yamana Gold in November 2006. Yamana Gold has terminated its interest in the property and returned the project to the Company.



46







The Company is currently in the process
of transferring the existing Bureau of Land Management Plan of Operations permit from Yamana Gold. Yamana completed the required
reclamation work to eliminate any future liability due to its exploration activities during Third Quarter 2012. After the permit
is transferred to the Company, the Company will seek a new venture partner to carry out additional exploration at the property.



The Clover prospect is a low sulfidation
epithermal, vein-hosted gold prospect situated along the northern margin of the Midas trough, on the southwest flank of the Snowstorm
Mountains. The property is underlain by mid-Miocene aged, bi-modal volcanic rocks on the western margin of the Northern Nevada
Rift.  These rocks are the stratigraphic equivalents to the units that host bonanza veins in the Midas district.



Sand Creek Uranium Joint Arrangement,
Wyoming



In August 2006, the Company entered into
the Sand Creek Uranium Project Exploration, Development and Mine Operating Agreement (the “Sand Creek Agreement”) with
Uranium One Exploration USA Inc, (“Uranium One”) to form the Sand Creek Joint Venture (the “Sand Creek JV”)
(This is a “joint operation” and not a “joint venture” as defined by IFRS.). The area of interest for the
Sand Creek JV covers an area of approximately 92,000 acres, located east and south of Douglas, Wyoming. In June 2009, the Company
entered into a supplemental agreement to the Sand Creek Agreement, which was amended in December 2012 (“the “Supplemental
Agreement”). Under the Supplemental Agreement, , Uranium One assumed the role of project manager and may spend up to $1.6
million before June 30, 2013 to increase its interest in the project from 30 percent to 51 percent. As of December 31, 2012, Uranium
One reports having spent $1.1 million of the $1.6 million, and having increased their interest to 39.3%. If Uranium One does not
earn up to a 51 percent interest in Sand Creek JV, then the Company may assume the role of operator in the project. At termination
or completion of the Supplemental Agreement, the Sand Creek Agreement will remain effective, and the parties’ operating interests
will be set in proportion to the amount of their respective expenditures or the 51/49 percent stipulated interest, as applicable.



The Sand Creek JV area was identified by
the Company and its former joint venture partners during a uranium exploration program in the early 1980s. Drilling during 1981
and 1982 in the program area consisted of 88 drill holes for approximately 69,000 feet. Within the program area, uranium drill-hole
intercepts, as defined by down-hole gamma logging, identified the potential for multiple uranium roll-front-type uranium deposits.
Uranium mineralization in the program area is hosted in the Chadron Formation, which is composed of sandstones, conglomerates,
and red to green siltstones and claystones. The sandstones are lenticular in nature and average from five to 20 feet in thickness
and occasionally range up to 45-feet in thickness. All of the claims are underlain by the uranium host rocks of the Chadron Formation.



In late 2006, a drilling program began
in the western portion of the Sand Creek JV area and 14 holes were completed totaling 10,395 feet, which demonstrated the presence
of “roll front” style uranium mineralization. A follow up drill program consisting of approximately 16 drill holes
totaling 11,700 feet was completed in mid-2007. Three of the 16 holes intercepted significant grades. The drilling program consisted
primarily of wide-spaced, reconnaissance style drilling with drill hole spacing of 500 to 1,000 feet.



During 2009, Uranium One completed 24 drill
holes to an average depth of 755 feet and totaling 18,074 feet. Ten of the twenty-four holes drilled encountered encouraging uranium
intercepts of greater than 0.25 foot-percent U3O8 with a highlight of 6 feet at 0.11 percent U3O8.



47







During 2011, Uranium One completed a total
of 32 holes with 13 (41 percent) encountering grade-thickness values (GT’s) of greater than 0.25 percent U3O8 x feet thickness.
The drilling program was designed to test the step-out and in-fill potential of the project’s roll front-style uranium mineralization.
Uranium One is working to update its mapping of the uranium trend and associated resources by integrating the new drilling. The
Company does not control the timing of future drilling operations under the terms of the Sand Creek Supplemental Agreement.







48







Montana
Mineral Rights



Atna owns approximately 0.9 million acres
of mineral rights in western Montana. The fee mineral rights underlay surface rights owned by other parties. The lands and mineral
rights are comprised primarily of lands assembled in the early 1900s by the former Anaconda Company for their timber and mineral
potential. The lands occur in thirteen counties in the mountainous terrain west of the Continental Divide, with most of the lands
being located within 50 miles east and west of Missoula, extending to the Idaho State line, and within 60 miles west of Kalispell
in northwestern Montana. The mineral rights contain many known occurrences of mineral commodities including gold, silver, copper,
barite and phosphate. The Company is in the process of subdividing this package for exploration joint venture or sale.



In February 2011, CR Montana Corporation,
a wholly owned Company subsidiary, signed an agreement with the Montana Department of Fish, Wildlife & Parks to sell 29,488
acres of mineral rights in the Fish Creek State Park area for a price of $0.15 million to the State of Montana. The sale was completed
November 29, 2012.



Bird Prospect, Montana



The Company
owns a 100 percent interest in 92 unpatented mining claims (the “Blue Bird Prospect”) in Granite County, Montana located
approximately 40 road miles southwest of the town of Phillipsburg, Montana. The Blue Bird Prospect, which was acquired by the Company
in January, 2013 by staking the BB II #1 through #6 claims, is located on a sedimentary-hosted copper-silver occurrence similar
to the copper-gold mineralization at the Troy, Rock Creek and Montanore deposits located to the northwest in Lincoln County, Montana.
Copper-silver mineralization is strataform and hosted by units of the Bonner Formation of the Precambrian Belt Super Group. Anaconda
Corporation drill-tested the Blue Bird Prospect in the late-1970s and early-1980s and more recently General Minerals Corporation,
which had an option on the property, tested the property. Historic Anaconda drill-hole intercepts include 19 feet grading 1.93
percent copper and 0.88 oz/ton silver. The Company is offering this property for joint venture.



Canadian Properties, Yukon and
British Columbia



In April 2011, the Company entered into
an agreement to option the Uduk Lake gold prospect in the Yukon to Canarc Resource Corporation (TSX:CCM). Under the option, Canarc
can acquire 100 percent interest in the Uduk claims by making option payments of $750,000 over a four year period ending in April
2015 and granting the Company a two percent NSR production royalty. The Uduk claims are located in the Windfall Hills area, located
65 kilometers south of Burns Lake, Yukon.



In July 2011, the Company entered into
option agreements to sell its Wolf, White Bull and Ecstall polymetallic exploration properties in the Yukon and British Columbia
to Mindat Research, a private British Columbia Corporation. The White Bull claims were returned in 2012 and the claims lapsed in
January of 2013.



The Wolf polymetallic prospect is located
in the Pelly Mountains of southeastern Yukon. The property is currently held as a joint venture with the Company controlling 65.6
percent and Yukon Nevada Gold Corporation (TSX:YNG) controlling 34.4 percent. Mindat will make option payments totaling $1.4 million
over the four years ending in June 2015 that will be split by the venture partners according to their respective interests. The
venture partners will also retain a 2.0 percent NSR position that will be allocated to their respective accounts. Mindat is current
on its option payments for Wolf.



49







The Ecstall polymetallic prospect is located
in the Skeena Mining District of British Columbia. Atna expects to receive $0.6 million in payments over the four years ending
June 2016 and additionally shall retain a NSR of between 0.5 percent and one percent depending on underlying royalty structures.
Mindat is current on its option payments.



ROYALTY INTERESTS



Atna controls a number of NSR royalty interests
on properties in both North and South America. These royalties are the result of property sales and property option exercises.
The summary list is shown below:





|Property  |  | Location         |  | Operator             |  | Atna NSR    |   | Metal         
|--------- |  | ---------------- |  | -------------------- |  | ----------- | - | --------------
|Ty        |  | Yukon, Canada    |  | Pacific Bay Minerals |  | 1.00        | % | Pb, Zn, Au, Ag
|Adelaide  |  | Nevada, USA      |  | Wolfpack Gold        |  | 0.5% to 1.5 | % | Gold          
|Tuscarora |  | Nevada, USA      |  | Wolfpack Gold        |  | 0.5% to 1.5 | % | Gold          
|Celeste   |  | Chile, Region II |  | Coro Mining          |  | 0.50        | % | Copper        
|Atlanta   |  | Nevada, USA      |  | Meadow Bay           |  | 300         | % | Gold          





CLOSURE PROPERTY



Kendall, Montana



Kendall is located approximately 20 miles
north of Lewistown, Montana, and is accessible by paved U.S. highway and graded dirt roads. Atna controls approximately 52 lots,
fee lands and patented claims covering a total of 644 acres. Kendall was developed as an open-pit, heap-leach gold mine that operated
from 1988 to its closure in 1995. Leaching of the remaining gold in the heap-leach pads continued through early 1998. Kendall produced
approximately 302,000 ounces of gold and 136,000 ounces of silver from 1988 through 1998.  From 1998 to the present time,
the Company has continued with closure activities, principally relating to collection, treatment and disposal of water contained
in the process system and mine area and re-vegetation of waste rock dump surfaces.



The Kendall
permit area covers approximately 1,040 acres of which approximately 448 acres are disturbed.  As of December 31, 2012, a total
of 432 acres or approximately 97 percent of the disturbed mining area has been reclaimed. CR Kendall has approximately $2.3
million on deposit in an interest bearing account with the Montana Department of Environmental Quality (“MDEQ”) for
reclamation at Kendall. A further $0.2 million surety bond is on deposit.



Kendall operated under permits issued by
MDEQ and other regulatory agencies. The Company is negotiating details of final mine closure with the MDEQ, and the MDEQ has approved
portions of the closure plan related to re-contouring, re-vegetation, drainage and heap dewatering, and heap closure, but discussions
concerning long-term water handling continue. In February 2002, the MDEQ issued a decision that a comprehensive EIS is needed to
study final closure approval at Kendall. The MDEQ has not completed this EIS. In 2006, Kendall was given approval to commence leach
pad capping operations and a bentonite enhanced basal layer was placed on all leach pads. Contouring and placement of top
soil on all disturbed areas at Kendall, with the exception of the leach pad areas, was substantially completed by the end of 2008.
In 2011, Kendall received permission from the MDEQ to place the final topsoil cover on the leach pads. The Company posted a $0.2
million surety bond with the MDEQ for this capping project in Second Quarter 2012. Soil placement was completed in September 2012
and seed is currently being placed to provide final vegetative cover. The Company believes that with completion of this cover,
reclamation earthwork at the site will be substantially complete. Water management and treatment at the site will be continued
for the foreseeable future. Since mine closure in 1996, approximately $14.9 million has been expended on closure and reclamation
activities at Kendall.



50







In April
2012, Kendall entered into an agreement with the MDEQ, whereby Atna agreed to provide financial support to complete the final EIS
closure study. As part of this agreement, Kendall submitted on July 25, 2012 an application to the MDEQ providing a final closure
and reclamation plan for the Kendall mine site. The MDEQ has agreed to perform a completeness review of this plan supported by
a closure EIS. The MDEQ is currently soliciting bids for its scope of work on the EIS. The EIS will be managed by the MDEQ in consultation
with Kendall. Any costs in excess of the EIS project budget will be shared equally between CRK and the MDEQ.



As reclamation objectives at Kendall are
achieved, parcels of land are being made available for purchase to the general public. In 2011, Kendall completed sales of 304.8
acres of reclaimed land in three parcels. This is in addition to 58.4 acres which were donated to the Montana Council of the Boy
Scouts of America in late 2010. Kendall retains the water rights associated with the sold parcels as well as right-of-access to
conduct environmental monitoring and additional reclamation, if required.



Regulatory
agencies must give final approval to all closure measures and be satisfied that the mine has met all reclamation requirements. 
There is no assurance of agency satisfaction with mine closure. Kendall uses internal and external technical and legal experts
to monitor and ensure environmental compliance. Atna believes the operation is currently in material compliance with all environmental
and safety regulations.



| | ITEM 4A. | UNRESOLVED STAFF COMMENTS
| | -------- | -------------------------



Not applicable.



| | ITEM 5. | OPERATING AND FINANCIAL REVIEW AND PROSPECTS
| | ------- | --------------------------------------------



The following discussion of the results
of operations of the Company for the last two years should be read in conjunction with the consolidated financial statements of
the Company included in Item 18 - Financial Statements.



| | A. | Operating Results
| | -- | -----------------



The Company’s expenditures were financed
primarily by cash from operations in 2012 and 2011, debt financings, equity financings including the exercise of warrants and options,
and proceeds from the sale of investments and assets. The Company restarted Briggs in 2009 and began recognizing positive operating
cash flows in the fourth quarter of 2010 based on Briggs revenues. Briggs gold production is currently the Company’s primary
source of revenue. The Company is presently developing the Pinson underground mine, which is expected to enter the commercial production
phase in 2013. The Company has substantially completed the first phase of developing Reward. The Company expects to commence construction
of the Reward mine once Pinson has achieved positive cash flow and the cash generated from both Briggs and Pinson has first been
used to strengthen Atna's balance sheet. The long-term success of the Company depends on the Company continuing to place into production
its portfolio of advanced stage exploration/development properties or to discover or acquire additional advanced-stage properties
with the potential to generate profit and cash flow.



The price of gold is denominated in U.S.
Dollars, and our current gold production operations and significant properties are located primarily in the U.S. The Company borrowed
C$20 million in 2011 pursuant to the Sprott Loan which gives rise to foreign currency exposure. The Company owns foreign mineral
rights primarily in the form of royalties which may create foreign currency exposure in the future if, and when, these foreign
properties are placed into production. Most of the Company’s current ongoing revenues, expenses, and assets are denominated
in U.S. Dollars, which the Company expects to continue in the foreseeable future.



51







The global economy has been experiencing
a period of high commodity prices and as a result the mining industry has been attempting to increase production. This has caused
significant upward price pressures on the operating costs of mining companies especially in the area of skilled labor. The skilled
labor needed by the mining industry is in tight supply and its cost is increasing. Many competitors have lower costs and their
mines are located in better locations that may give them a competitive advantage in hiring and retaining qualified employees.



The cost of fuel to run machinery and generate
electricity is closely correlated to the price of oil. Over the past two years, the price of oil has been range bound at what was
previously considered a high level. Upward price pressures on operating costs may cause lower operating cash flows and have an
adverse impact on the Company’s results of operations. Diesel fuel costs represented over 21 percent of cost of sales in
2012 and over 25 percent of cost of sales in 2011. The Company periodically enters into forward purchase agreements for diesel
fuel in order to reduce price risk for a portion of its usage. The Company entered into purchase contracts for approximately 25
percent of Briggs’ diesel usage in 2011 at delivered prices below then current market prices. While the Company entered into
purchase contracts for approximately 25 percent of Briggs’ diesel usage in 2012, the impact upon the financial results was
not material.



Results of Operations – Year
Ended December 31, 2012 versus Year Ended December 31, 2011



Atna generated net income of $6.9 million,
$0.05 per basic share, in 2012. Income before income tax was $7.1 million in 2012. These 2012 results compare to a net income of
$15.1 million, $0.14 per basic share, for 2011. Income before income tax was $6.0 million in 2011. Significant elements of the
$1.1 million increase in income before income tax and the $8.2million decrease in net income between the two periods are
presented below.



| | · | Gold and silver revenues increased $8.0 million, or 15 percent, to $59.8
million in 2012 relative to 2011. Gold ounces sold increased from 32,371 to 35,641 ounces, a 10 percent increase, and the
average price realized per gold ounce increased from $1,588 to $1,667, a 5 percent increase.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Cost of sales, excluding depreciation, increased $5.4 million, or 18 percent, in 2012. Sales volumes
increased 10 percent, so a net 8 percent increase relates to increased per unit costs. Ore-mining productivity decreased in the
fourth quarter of 2012 due to sequencing issues in accessing ore, including: reduced working space in the bottom of the Main pit,
the unusual presence of water in the Main pit, and the narrow approach to and bottleneck in the Goldtooth North Pit. Costs per
unit increased in 2012 as a result of the secondary crusher outage; an unusual cycling of high-cost wear items, primarily tires
and conveyor belts; relocation and repair of the leach pad stacking system; and increasing diesel fuel prices. Stripping activities
are capitalized to the extent that they exceed an expected average stripping ratio for each pit / component, but these costs are
not later reported as depreciation but rather as cost of sales, excluding depreciation, when underlying minerals are mined. Hence,
$3.1 million of cost of greater-than-average stripping activities in years prior to 2012 were carried forward into the 2012 inventory
and cost of sales.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Depreciation and amortization within cost of sales increased $0.5 million, or 7 percent, in 2012
relative to 2011. The units-of-production method of calculating depreciation generally causes depreciation to vary with the volume
sold. The increase in depreciation was not as great as the increase in ounces sold due largely to a declining / older asset base
at Briggs.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | General and administrative expenses increased $0.4 million, or 8 percent, to $4.8 million in 2012
due to legal and consulting support, slightly higher levels of staff, and Sarbanes-Oxley compliance audit fees.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Exploration expenses increased $1.1 million to $1.7 million in 2012 due to drilling programs at
Pinson open-pit and Columbia that will contribute to feasibility studies for those sites, and at Briggs for a study of uncertain
future benefit. Much of the drilling at Briggs and Reward in 2011 was capitalized.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



52







| | · | The provision for site restoration increased $0.5 million to $0.4 million in 2012 due to an increase
in estimated future reclamation costs at Kendall.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Interest expense decreased $1.0 million, or 42 percent, to $1.3 million for 2012 principally as
the result of the retirement of scheduled portions of the 2009 Gold Bonds and capitalization of interest associated with the Pinson
project.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | The realized and unrealized gains and losses on derivatives decreased income by $0.8 million in
2012, whereas in 2011 they decreased income by $1.9 million, an increase in income of $1.1 million. The influence of period-end
gold prices on the embedded forward derivatives in the 2009 Gold Bonds drove these gains and losses. In 2012, a realized loss of
$1.9 million and an unrealized gain of $1.1 million were recognized for changes in the market value of the embedded 2009 Gold Bond
derivatives.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Gains and losses on the disposal of assets decreased income by $0.9 million in 2012 relative to
2011. In 2012, losses on disposals aggregated $0.4 million, principally related to early disposals of a haul-truck engine and pond
netting. In 2011, the Atlanta property in Nevada and miscellaneous other properties were sold, resulting in gain of $0.6 million.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | In 2012, other income included a gain of $0.2 million realized as a
result of an insurance settlement of $0.4 million for the principal property damage claim related to the failure of the secondary
crusher.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | 2011 net income included a one-time $9.5 million deferred tax benefit, recognized principally in
expectation of being able to use more of Atna’s past NOL’s in future years. This was partially offset by a $0.4 million
current tax liability for 2011, resulting in a net $9.1 million income tax benefit. 2012 current tax expense was $0.1 million and
deferred tax expense was $0.1 million.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As of December 31, 2012, cash and cash
equivalents were $19.3 million, an increase of $9.4 million since December 31, 2011. The significant elements underlying the net
increase in cash in 2012 are presented below with comparisons to 2011.



| | · | A stock offering in Third Quarter 2012 netted $16.3 million. The proceeds of the stock offering
will principally be used toward the development of Pinson-underground. In 2011, a new debt obligation contributed $20.1 million;
$15.0 million of this cash being used in 2011 toward the acquisition of a 100 percent ownership interest in Pinson.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $21.7 million was used for mine development and to acquire capital equipment principally at Pinson
($16.7 million) and Briggs ($3.4 million) in 2012 while $9.9 million was used principally at Briggs and Pinson in 2011.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Additionally, $2.2 million of interest was capitalized for Pinson in 2012 whereas $0.7 million
of interest was capitalized for Pinson in 2011.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------

| | · | In 2012, $1.4 million was received for Pinson ore shipments, while Pinson was in development, reducing
net capital spending.
| | - | ----------------------------------------------------------------------------------------------------------------------------

| | · | In 2012, $0.5 million was expended on stripping activity assets at Briggs whereas $4.0 million
was expended on stripping activity assets in 2011.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $0.4 million was received in 2012 as an insurance settlement for the principal claim related to
the mechanical failure of the secondary crusher at Briggs in June of 2012.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $13.6 million was provided by operations in 2012, inclusive of a $2.4 million increase in working
capital, compared to $15.5 million provided by operations in 2011, inclusive of a $1.1 million decrease in working capital. The
$1.9 million decrease in cash flows from operations principally resulted from the $3.5 million aggregate increase/change in working
capital in turn largely resulting from inventory build-ups at Briggs.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $5.6 million was used for the scheduled repayments of notes, 2009 Gold Bonds, and capital leases
in 2012 compared to $6.0 million used for debt repayments in 2011.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------



53







| | · | Warrants and option exercised in 2012 contributed $6.3 million whereas warrants and options exercised
in 2011 contributed $0.2 million.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------

| | · | In 2012, $0.4 million was provided by decreasing reclamation-bond security deposits in turn related
to decreased collateral requirements by a surety, net of new requirements. In 2011, $0.7 million was used principally for Pinson’s
reclamation bond.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | In 2012, $0.8 million was provided through the sale of investments while proceeds from the sale
of investments in 2011 contributed $0.5 million.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Disposition of property provided $0.1 million in 2012. In 2011, $0.5 million was provided through
the sale of the Atlanta property.
| | - | -----------------------------------------------------------------------------------------------------------------------------------

| | · | Other changes in cash flows in 2012 netted $0.1 million in contributions and in 2011 netted $0.1
million in uses.
| | - | -----------------------------------------------------------------------------------------------------------------



Results of Operations – Year
Ended December 31, 2011 versus Year Ended December 31, 2010



Atna generated net income of $15.1 million
($0.14 per share) for 2011 compared to a net loss of $5.9 million (-$0.07 per share) for 2010. Significant elements of the $21.0million favorable variance in net income between the two years are presented below.



| | · | Revenues increased $21.2 million, or 69 percent, from $30.5 million in 2010 to $51.7 million in
2011, inclusive of incidental sales of silver. This increase in revenues was primarily attributable to the Company selling 32,371
ounces of gold in 2011, a 29 percent increase over the 2010 volume of 25,094 gold ounces, and an increase in the average price
per gold ounce sold to $1,588 in 2011 from $1,211 in 2010.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Cost of sales, exclusive of depreciation and amortization, increased $8.6 million, or 40 percent,
in 2011 compared to 2010. Briggs uses diesel fuel both for the generation of power and for mobile mining equipment. Diesel fuel
represented over 22 percent of operating costs in 2011 compared to 17 percent in 2010. Diesel fuel costs increased significantly
in 2011, which was partially mitigated by purchase contracts for approximately 25 percent of Briggs’ diesel usage at delivered
prices below then current market prices. 2011 costs were also adversely impacted by increased crusher and equipment maintenance
and cyanide costs. Labor costs were impacted in the fourth quarter of 2011 by adding and training new personnel in order to operate
24 hours per day, seven days per week. The new personnel were included in existing operating crews, but produced only limited benefit
to production during the training period. Labor costs were also impacted by a profit sharing plan which was initiated in 2011 for
Briggs employees, costing 4 percent of the site’s gross profit (revenue less cost of sales).
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Depreciation expense increased $2.1 million, or 39 percent, in 2011 compared to 2010. Expansions
of the leach pad and gold recovery plant at Briggs were completed in 2011, but much of the increase followed from the use of the
units-of-production method of depreciation applied to an increased production volume. 33,018 ounces of gold were recovered from
the carbon circuit in 2011 relative to 25,784 ounces in 2010, a 28 percent increase. Estimated, recoverable, in-process gold inventory
increased by 2,083 ounces in 2011, an additional 8 percent increase relative to the 2010 production statistic.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | General and administrative expenses increased $0.8 million, or 23 percent, in 2011 compared to
2010. The increase was driven principally by (i) a Company-wide, share based compensation increase of $0.3 million, (ii) a combination
of special bonuses related to the Pinson acquisition, (iii) the creation of the position of chief operating officer (COO), (iv)
recruiting expenses for both a COO and a chief financial officer (CFO), and (v) increases in other executives’ compensation
to more closely align with competitive market conditions.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | Exploration expenses decreased $0.5 million, or 43 percent, in 2011 compared to 2010 as activities
were focused within existing mine areas and $1.4 million of activity at Briggs was capitalized.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



54







| | · | Interest expense decreased $0.7 million, or 27 percent, in 2011 compared to 2010 based largely
on a lower average liability balance, reflecting repayment of debentures and scheduled reductions in the Gold Bonds described below.
| | - | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | The realized loss on derivatives increased from $0.5 million in 2010 to $1.5 million in 2011 largely
reflecting the increased payments on the Gold Bonds as underlying gold prices increased.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | The unrealized loss on derivatives decreased from $2.0 million in 2010 to $0.3 million in 2011
as previously recognized increases in the Gold Bond liabilities, driven by the market value of gold, were realized and as all other
derivatives were eliminated in the second half of 2010.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | In 2011, the Company sold its interest in the Atlanta property in Nevada for $0.7 million in cash
largely leading to the recognized gain on asset disposal of $0.6 million.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | 2011 net income includes a $9.5 million deferred tax benefit recognized principally in expectation
of being able to use more of Atna’s past NOL’s in future years. This was partially offset by a $0.4 million current
tax liability for 2011, resulting in a net $9.1 million income tax benefit.
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As of December 31, 2011, cash and cash
equivalents were $10.0 million, an increase of $0.4 million from December 31, 2010. The primary elements of the net increase in
cash in 2011 are presented below.



| | · | $20.1 million was provided through new debt financing, principally the C$20 million loan from Sprott,
in 2011 compared to $8.4 million provided through the issuance of common shares in 2010.
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $11.5 million was provided by operations, net of a $2.9 million increase in working capital, in
2011 compared to $4.7 million, inclusive of a $7.9 million increase in working capital, used by operations in 2010.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $0.9 million was provided through the sale of non-core properties and investments in 2011 compared
to $0.5 million in 2010.
| | - | ---------------------------------------------------------------------------------------------------------------------------

| | · | $0.2 million was provided through the exercise of stock options and warrants in 2011 compared to
$0.1 million in 2010.
| | - | ----------------------------------------------------------------------------------------------------------------------

| | · | $15.0 million was used to pay for a portion of the purchase price of the 70 percent interest in
Pinson in 2011.
| | - | ---------------------------------------------------------------------------------------------------------------

| | · | $9.9 million was used to acquire capital equipment and for mine development, principally at Briggs,
in 2011 compared to $1.6 million in 2010.
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------

| | · | $6.0 million was used for the repayment, in part or in whole, of notes, Gold Bonds, and capital
leases in 2011 compared to $5.1 million used for debt repayments in 2010.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | · | $1.4 million was used to increase surety deposits and for capitalized interest, both principally
related to the development of Pinson, in 2011 compared to $1.0 million in 2010, which was principally related to Reward.
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



As noted, 2011 net income includes a $9.5
million deferred tax benefit recognized principally in expectation of being able to use more of Atna’s past U.S. NOL’s
based on expected results. A change of ownership under Section 382 of the Internal Revenue Code occurred due to the Atna/Canyon
merger in 2008.   As a result of the ownership change, the utilization of U.S. NOL’s existing at the merger date
is limited to approximately $1.0 million per annum.



| | B. | Liquidity and Capital Resources
| | -- | -------------------------------



Atna expects that cash requirements over
the next 12 months, including those for investments in mine development and servicing existing debt, can be met through a combination
of cash flow from the Briggs and Pinson operations, existing cash, and equipment financing. Supplemental financing, if required,
may be generated from the issuance of debt, convertible bonds, or equity; new lines of credit; asset sales; or combinations thereof.
The Company’s 2013 budget and recent forecasts indicate that supplemental financing will not be required; however this is
principally contingent upon Pinson developing on schedule and at projected costs as well as upon Briggs realizing operating cash
flows and other factors.



55







Funding requirements could be significantly
affected by the future price of gold, any unforeseen, prolonged production disruptions at Briggs or Pinson, the working capital
and mine development expenditures at Pinson prior to attainment of commercial production, and other events. Drilling and development
projects at Reward, Pinson open-pit, and Columbia are progressed only as funds become available. Atna is considering additional
sources of financing to address any potential contingent risk of having inadequate capital to complete the Pinson underground development
in 2013 and possibly to accelerate the development of Reward.



As of December 31, 2012, the Company had
net working capital (current assets less current liabilities) of $6.4 million. Current assets included cash of $19.3 million and
recoverable gold inventories of approximately 16,600 ounces at Briggs and approximately 820 payable ounces at Pinson which had
a combined cost or recorded value of $19.7 million. The gold inventory had a gross market value of approximately $29.0 million
based on the period-end gold price of $1,664 per ounce.



Past cash requirements were met through
the use of a combination of operating cash flows, asset sales, and debt and equity financings. In December 2010, the Company completed
a $9.2 million equity offering. In August 2011, the Company arranged a C$20 million line of credit with Sprott to finance the acquisition
of the remaining 70 percent interest of Pinson. In September 2011, the Company acquired the remaining 70 percent of Pinson for
15 million shares of common stock, $15 million in cash, and other consideration. In February of 2012, the term of the C$20 million
credit facility with Sprott was extended into 2013; and in first quarter 2013, the remaining credit facility of C$17.5 million
with Sprott was extended with C$1.46 million due each month commencing September 30, 2013 and ending on August 29, 2014. In September
of 2012, the Company completed a C$17.25 million equity offering, principally to complete funding for the Pinson-underground mine
development.



The two principal uses of funds anticipated
within the next 12 months is expected to be completion of development funding for the Pinson underground mine. The total project
cost is expected to be approximately $31 million, of which $22.8 million has been spent through December 31, 2012, net of pre-production
sales and ARO adjustments. The second principal use of funds anticipated within the next 12 months is expected to be the reduction
of debt. C$1.46 million is due to Sprott for each of the 12 months beginning September 30, 2013. Quarterly principal and estimated
derivative payments of $1.3 million are due to the 2009 Gold Bond holders through December 31, 2013.



With Briggs
as Atna’s only operating mine in 2012 and in 2011,net cash provided by operating activities was $13.6 million and
$15.5 million, respectively.Briggs sold 35,641 ounces of gold in 2012 at an average price of $1,667,
and including silver byproduct sales, generated $59.8 million in revenue.In 2013, Briggs is expected to produce and sell
35,000 to 43,000 ounces of gold at an annual average cash cost of between $850 and $900 per ounce. Both higher production and lower
costs per unit are expected in the latter half of 2013 after incremental mine development has been completed at Briggs in the first
half of 2013. The waste stripping ratio is projected to be 3.8 tons of waste per ton of ore, which would lead to an increase in
the stripping activity asset of roughly $6 million. Briggs capital spending in 2013 is expected to be between $3.6 million and
$4.6 million.



Pinson ore production is expected to increase
throughout 2013 as additional ore stopes are developed. Pinson is expected to produce between 50,000 and 57,000 ounces of gold
in 2013 at a projected cash cost of between $900 to $950 per ounce, including all royalties and severance taxes. The majority of
this production is expected to occur in the second half of 2013. The cash cost per ounce during development and ramp-up in early
2013 may be relatively high, and the Company believes it may not be indicative of ongoing costs. The net capital spending in 2013
to complete the initial development of the Pinson underground mine is expected to be $8 million to $10 million. In order to continue
to access ore, there will also be ongoing primary and secondary mine development costs after Pinson completes its initial development,
estimated to range from $5.0 million to $7.0 million in the second half of 2013.



56







The only existing gold hedge as of December
31, 2012 and of the date of this report is a forward gold sales contract embedded in the 2009 Gold Bonds. The 2009 Gold Bonds are
serviced through quarterly payments essentially equal to the market value of 814 ounces of gold, plus 10 percent interest on the
declining principal balance. This gold sales commitment represents less than nine percent of the expected gold production from
Briggs in 2012.



Financing Transactions



Equity Issuance: On September 12,
2012, the Company completed a short-form prospectus financing and issued 17.25 million common shares for gross proceeds of C$17.25
million and net proceeds of C$16.0 million. In addition, the Company issued a total of 1,035,000 brokers’ warrants with an
exercise price of C$1.00 and an eighteen-month term. The warrants were determined to have a fair value at the time of issuance
of C$0.3 million.



In 2012, the Company issued 8.5 million
shares upon the exercise of outstanding warrants at C$.70 per share providing $6.0 million, 1.3 million shares upon the exercise
of vested options providing $0.3 million, and 0.6 million shares for fees related to the extension of the credit line with Sprott
at a deemed price of $0.97 per share, valued at $0.6 million. In first quarter 2013, 0.7 million shares are being issued for fees
related to the second extension of the credit line with Sprott at a deemed price of $0.78 per share, valued at $0.5 million.



A roll forward of the Company’s common
shares outstanding during 2012 follows.





|                                 |  | Number of |            
|-------------------------------- |  | --------- | -----------
|                                 |  | Shares    |            
|Balance, beginning of the period |  |           | 117,374,643
|Sprott credit agreement          |  |           | 618,556    
|Warrant exercises                |  |           | 8,459,911  
|Option exercises                 |  |           | 1,286,812  
|Equity Offering                  |  |           | 17,250,000 
|                                 |  |           |            
|Balance, end of the period       |  |           | 144,989,922



As of March 20, 2013; 145,140,466 common
shares were outstanding. This figure excludes the 675,240 common shares payable to Sprott, pending final approval by the TSX.



Debt Issuance: In February of 2012,
Atna and Sprott agreed to extend the existing C$20 million credit facility with repayments of principal due as follows: C$2.5 million
on February 28, 2013, C$2.5 million on May 31, 2013, and C$15 million on August 31, 2013. However, in March of 2013, Atna and Sprott
agreed to an extension of the remaining C$17.5 million credit facility with 12 equal monthly payments due Sprott commencing September
30, 2013 and ending on August 29, 2014. Interest on unpaid principal balances continues to accrue at an annual rate of 9 percent
compounded monthly and payable quarterly. Assets owned by Atna Resources Ltd, Atna Resources Inc. (ARI), and Canyon Resources Corp.
(CRC), excluding interests in subsidiaries of CRC other than ARI, were pledged as security against this loan. Covenants also restrict
equipment financings to $20 million, preclude the issuance of new debt with the exception that up to $35 million of new debt for
the construction of the Reward mine may be incurred after the Sprott loan has been reduced to C$11.5 million; and require Sprott’s
consent for material asset sales. The loan origination costs, including those for the extensions,
were capitalized and will be amortized over the minimum contractual life of the loan facility. The amortized loan fees are expected
to be recapitalized as Pinson mine development costs.



57







Notes
Payable: On March 1, 2011, the Company repaid $0.8 million in convertible debentures due on that date. On March 10, 2011, the
Company prepaid C$1.3 million of 12 percent debentures of which C$1.0 million was converted into 2.0 million shares of common stock,
thereby retiring the entirety of the debentures.



2009 Gold Bonds Payable: On December
9, 2009, the Company closed a private placement of $14.5 million of Gold Bonds (the “2009 Gold Bonds”). The 2009 Gold
Bonds will mature on December 31, 2013 and have an annual interest rate of 10 percent. The 2009 Gold Bonds are redeemed in quarterly
installments each equivalent to the market value of 814 ounces of gold per quarter based on a closing gold price ten trading days
prior to the end of each quarter. The 2009 Gold Bond financing limits the Company’s hedge position to 50 percent of its future
estimated consolidated gold production and requires the Company to provide a negative pledge to not create any further indebtedness
at the Briggs Mine, subject to certain permitted exceptions such as for equipment financing.



The Company recorded an initial discount
on the 2009 Gold Bonds of $1.8 million. The discount was comprised of $1.2 million of transaction costs associated with the 2009
Gold Bonds and the $0.6 million initial fair value of the embedded derivative. The embedded derivative has been separated from
the 2009 Gold Bond principal and is the result of the 2009 Gold Bonds calling for the forward sale of 814 ounces of gold per quarter
through December 31, 2013 at a price of $1,113, the spot price of gold at the time the bonds were issued. The fair value of the
embedded derivative fluctuates with changes in the forward price of gold. The initial fair value of the embedded derivative was
discounted at the Company’s assumed borrowing rate of 12 percent. Financial metrics related to the 2009 Gold Bonds follow.





|                                              |  | As of December 31, |            |   | As of December 31, |  
|--------------------------------------------- |  | ------------------ | ---------- | - | ------------------ | -
|                                              |  | 2012               |            |   | 2011               |  
|                                              |  |                    |            |   |                    |  
|Current gold bond derivative liaibility       |  | $                  | 1,733,500  |   |                    | $
|Long-term gold bond derivative liability      |  |                    | -          |   |                    |  
|Total gold bond derivative liability          |  | $                  | 1,733,500  |   |                    | $
|                                              |  |                    |            |   |                    |  
|Current gold bond liaibility                  |  | $                  | 3,494,800  |   |                    | $
|Long-term gold bond liability                 |  |                    | -          |   |                    |  
|Total gold bond liability                     |  | $                  | 3,494,800  |   |                    | $
|                                              |  |                    |            |   |                    |  
|                                              |  | Twelve Months 2012 |            |   | Twelve Months 2011 |  
|                                              |  |                    |            |   |                    |  
|Realized loss on gold bond derivatives        |  | $                  | (1,865,300 | ) |                    | $
|Unrealized gain loss on gold bond derivatives |  | $                  | 1,111,700  |   |                    | $
|Interest on gold bond liabilities             |  | $                  | (589,100   | ) |                    | $
|Bond discount amortized as interest expense   |  | $                  | (338,600   | ) |                    | $





Investing Transactions



Disposition of Assets: In 2012 and 2011,
the Company received $0.8 million and $0.5 million, respectively, in cash for investments sold. The investments sold were principally
stock in other mining companies acquired in exchange for joint venture or property option interests.



58







In 2012,
the Company received $0.4 million from the settlement of an insurance claim related to the mechanical failure of the secondary
crusher at Briggs, $0.4 million from the reduction in collateral for reclamation surety bonds, and $0.1 million from the sale of
other property and equipment. In 2011, the Company increased its reclamation surety deposits by $0.7 million and received $0.5
million from the sale principally of the Atlanta property, unpatented mining claims in Nevada.



Capital
Expenditures:Cash expended for mine development and capital
purchases in 2012 was $21.7 million. These capital expenditures were principally for development of the underground mine at Pinson
and crusher improvements at Briggs. Additionally, in 2012, capitalized interest of $2.2 million was paid for financing and development
of Pinson and capital was reduced by $1.4 million as a result of ore sales by Pinson. $0.5 million was expended in 2012 for stripping
activity assets at Briggs, whereas $4.0 million was expended in 2011.



The principal capital expenditure in 2012
and expected in 2013 is the underground mine development at Pinson. Approximately $31 million has been budgeted in aggregate through
2013, principally for a secondary access, primary and secondary mine development, ventilation, and other direct mine development.
An underground mining contractor was mobilized to the Pinson site early in 2012. The mining contractor is providing most of their
own mining equipment, which reduces Atna’s investment. The Company does not anticipate investing in processing equipment
at Pinson because the Company has entered into agreements to either sell or process ore at third-party facilities. Net collateral
anticipated to be required for the placement of reclamation bonds is included in the budgeted cash requirement.



Briggs’ additions to capital and
development were $3.4 million in 2012. Capital spending at Briggs related principally to crusher improvements and the replacements
of a generator, haul-truck engine, and other equipment. Drilling and development projects at Reward, Pinson open-pit, and Columbia
are progressed as funds become available.



The capital expenditures stated above have
been approved for expenditure by the Company on a case-by-case basis and may be modified over time based on judgments as to potential
benefits, project requirements and the availability of funds.



Outstanding Warrants



The following table summarizes warrants outstanding
as of December 31, 2012. Based on the Company’s current stock price, the Company expects that the exercise of stock warrants
may be a potential additional source of funds in 2013.





|                |  |                |          |  | Underlying | 
|--------------- |  | -------------- | -------- |  | ---------- | 
|Expiration Date |  | Exercise Price |          |  | Shares     | 
|                |  |                |          |  |            | 
|11-Mar-14       |  |                | CAD$1.00 |  |            | 
|                |  |                |          |  |            | 
|                |  |                |          |  |            | 



As of the reporting date, March 20, 2013;
none of the above 1,035,000 warrants had been exercised.



Surety Bonds



All surety bonds are subject to annual
review and adjustment. Additional permitting, extension of mine life, areas of mining activity and changes in the regulatory environment
affect surety requirements.



59







Briggs operates under permits granted by
various agencies including the BLM, Inyo County, California, the California Department of Conservation, and the Lahontan Regional
Water Quality Control Board. The Company has posted cash and reclamation bonds with these agencies in the amount of $4.4 million
of which $4.3 million are reclamation bonds supported by a surety. Restricted cash held as collateral by the sureties and government
agencies amounts to $1.8 million.



The total bonding requirement for Reward
was determined to be $6.2 million. In July 2010, the Company posted with the State of Nevada an initial bond backed by surety of
$0.9 million to cover development activities that include the installation of fencing, site road improvements, in-fill drilling,
water wells and related pipelines, other earthwork and installation of power lines and facilities. The Company placed $0.8 million
into a collateral account related to the surety bond. The remaining $5.3 million in bonding is not expected to be required until
mine development is continued in 2013.



The total bonding requirement for Pinson
is roughly $2.0 million of which Atna has already replaced one bond of $0.8 million. The remainder of the bonds, approximately
$1.2 million, is pending review Federal and State agencies.



The Company
has on deposit with the MDEQ $2.3 million in an interest bearing account for reclamation at the Kendall Mine. The Company deposited
an additional $0.2 million with the MDEQ in 2012 as a special purpose bond in connection with the 2011 approval of the final leach
pad capping plan. The Company expects to spend approximately $0.6 million in 2013 to complete the capping.



| | C. | Research and Development, Patents and Licenses, etc.
| | -- | ----------------------------------------------------



Not applicable.



| | D. | Trend Information
| | -- | -----------------



|                         |  | 2012 |            |  | 2011 |   |            | Percent Increase (Decrease) | 
|------------------------ |  | ---- | ---------- |  | ---- | - | ---------- | --------------------------- | 
|Revenues                 |  |      | 59,763,300 |  |      | $ | 51,755,400 |                             | 
|Operating income(loss)   |  |      | 9,153,800  |  |      | $ | 9,047,400  |                             | 
|Net income(loss)         |  |      | 6,886,000  |  |      | $ | 15,084,400 |                             | 
|Tons mined               |  |      | 8,515,300  |  |      |   | 12,535,600 |                             | 
|Gold ounces mined        |  |      | 45,900     |  |      |   | 43,500     |                             | 
|Gold ounces produced     |  |      | 36,900     |  |      |   | 32,500     |                             | 
|Gold ounces sold         |  |      | 35,700     |  |      |   | 32,400     |                             | 
|Cash cost per Ounce sold |  | $    | 985        |  |      | $ | 915        |                             | 
|Gold price per Ounce     |  | $    | 1,667      |  |      | $ | 1,588      |                             | 



Briggs was the Company’s only operating
mine in 2012 and 2011. Briggs continued to increase production in 2012 benefiting from mine development and production stripping,
crusher circuit improvements, and a leach-pad expansion in 2011. The Company benefited from increasing gold prices, but was negatively
impacted by increasing costs of maintenance, consumables, fuel, and equipment, and by a shortage of skilled mining labor. Briggs
gold production was 36,900 ounces in 2012 and is expected to range between 35,000 and 43,000 ounces in 2013. While the Company
expects to realize benefits from crusher and other capital improvements completed in 2012, additional stripping and mine development
are required in the first half of 2013 that will limit production in those quarters but that the Company expects will provide a
benefit for the next several years. Briggs annual average cash cost in 2013 is expected to be between $850 and $900 per ounce,
however lower costs per unit are expected in the latter half of 2013 after higher mine development activities have been completed
and production rates are expected to increase.



60







The Company expects to complete the initial
development of the Pinson underground mine in the first half of 2013. Pinson is expected to produce between 50,000 and 57,000 ounces
of gold in 2013 at a projected cash cost of between $900 to $950 per ounce, including all royalties and severance taxes. The majority
of this production is expected to occur in the second half of 2013. The Company expects the cash cost per ounce during development
and ramp-up in early 2013 may be relatively high and not indicative of ongoing costs.



The Company believes its short-term financial
success is dependent upon 1) ramping-up Pinson to commercially sustainable production levels within a reasonable time and with
capital expenditures not exceeding those projected, and 2) Briggs generating sufficient levels of cash flow to support its own
mine development and equipment additions in 2013, the 2009 Gold Bond debt-service, and corporate overhead. The Company believes
its long-term success depends on the Company continuing to place into production its portfolio of advanced stage exploration and
development properties or to discover or acquire additional advanced-stage properties with the potential to generate profit and
cash flow. The Company’s strategy is to sequentially develop mining properties, commencing with construction of the Reward
mine once Pinson has achieved positive cash flow and the cash generated from both Briggs and Pinson has first been used to strengthen
its balance sheet. In 2013, the Company also anticipates completing the feasibility study for the Pinson open pit project and commencing
the feasibility study for the Columbia project. The market value of the Company’s assets is largely dependent upon factors
beyond the Company’s control such as precious metal prices, availability of financing at reasonable terms and many other
factors.



The cost for diesel fuel continues to fluctuate
with the market price of oil. Diesel fuel is and will continue to be a significant operating and reclamation expense. The Company
expects continued high fuel costs, increased hiring costs, and the cost of retaining qualified mining personnel to have an impact
on continuing operations in the future.



| | E. | Off-Balance Sheet Arrangements
| | -- | ------------------------------



As of December 31, 2012 and 2011, the Company
had no outstanding off-balance sheet arrangements.





| | F. | Tabular Disclosure of Contractual Obligations
| | -- | ---------------------------------------------



The Company’s
material contractual obligations as of December 31, 2012 follow.





|                                 |  | Payments due by Period as of December 31, 2012 |           
|-------------------------------- |  | ---------------------------------------------- | ----------
|                                 |  |                                                |           
|                                 |  |                                                |           
|                                 |  | Total                                          |           
|Trade and other payables         |  | $                                              | 7,163,500 
|Finance lease obligations        |  |                                                | 3,330,900 
|Derivative financial instruments |  |                                                | 1,733,500 
|Long term debt obligations       |  |                                                | 26,601,400
|                                 |  |                                                |           
|Total                            |  | $                                              | 38,829,300





Based on subsequent events, specifically
the extension of C$17.5 million of the Sprott loan otherwise due by August 31, 2013, now due in twelve equal monthly increments
of C$1,458,333 starting September 30, 2013; this table includes the reclassification of C$11.7 million from the ‘Less than
1-year’ column to the ‘1-3 years’ column.



61







ITEM
6.	DIRECTORS, SENIOR MANAGEMENT AND EMPLOYEES



| | A. | Directors and Senior Management
| | -- | -------------------------------



Names, state or province of residence,
offices and principal occupations of the members of the board of directors of the Company (the “Board”) and senior
executives of the Company are as follows:



|Name and Municipality ofResidence                      |  | Office heldwith theCompany                      |  | Director orOfficersince |  | Other PrincipalDirectorships                                                                                                                                                                                  |  | PrincipalOccupation                                                             
|------------------------------------------------------ |  | ----------------------------------------------- |  | ----------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | --------------------------------------------------------------------------------
|David H. Watkins(3)
        British Columbia, Canada   |  | Chairman andDirector                            |  | March 2000              |  | EURO Ressources SA,
        Golden Minerals Company,
        Argonaut Gold,
        Commander Resources Ltd.,
        Bearing Resources Ltd.
        Camino Minerals Corporation &
        Rio Novo Gold Inc. |  | Retired                                                                         
|                                                       |  |                                                 |  |                         |  |                                                                                                                                                                                                               |  |                                                                                 
|Glen D. Dickson(1,2)
        British Columbia, Canada  |  | Director                                        |  | December 2002           |  | Brazilian Gold Corporation,  Venerable Ventures Ltd. and Elgin Mining Inc.                                                                                                                                    |  | Retired                                                                         
|                                                       |  |                                                 |  |                         |  |                                                                                                                                                                                                               |  |                                                                                 
|David K. Fagin(1,3)Colorado, United States             |  | Director                                        |  | March 2008              |  | Pacific Rim Mining Corp.                                                                                                                                                                                      |  | Investor                                                                        
|                                                       |  |                                                 |  |                         |  |                                                                                                                                                                                                               |  |                                                                                 
|Christopher E. Herald(2,3,4)Colorado, United States    |  | Director                                        |  | August 2009             |  | Solitario Exploration and Royalty Corp., and Denver Gold Group                                                                                                                                                |  | President and Chief Executive Officer of Solitario Exploration and Royalty Corp.
|Ronald D. Parker(2,4)Missouri, United States           |  | Director                                        |  | March 2008              |  | None                                                                                                                                                                                                          |  | Retired                                                                         
|                                                       |  |                                                 |  |                         |  |                                                                                                                                                                                                               |  |                                                                                 
|Paul H. Zink(1,3)
        Colorado, United States      |  | Director                                        |  | April 2011              |  | Rare Element Resources Ltd.                                                                                                                                                                                   |  | Chief Executive Officer, Americas Bullion Royalty Corp                          
|                                                       |  |                                                 |  |                         |  |                                                                                                                                                                                                               |  |                                                                                 
|James K. B. Hesketh(4)
        Colorado, United States |  | President, Chief Executive Officer and Director |  | September 2001          |  | None                                                                                                                                                                                                          |  | President & Chief Executive Officer of the Company                              
|                                                       |  |                                                 |  |                         |  |                                                                                                                                                                                                               |  |                                                                                 
|William R. Stanley
        Arizona, United States      |  | Vice President  Exploration                     |  | January 2004            |  | None                                                                                                                                                                                                          |  | Vice President Exploration of the Company                                       



62







|Name and Municipality ofResidence            |  | Office heldwith theCompany                         |  | Director orOfficersince   |  | Other PrincipalDirectorships |  | PrincipalOccupation                                    
|-------------------------------------------- |  | -------------------------------------------------- |  | ------------------------- |  | ---------------------------- |  | -------------------------------------------------------
|Rodney D. GlossColorado, United States       |  | Vice President and Chief  Financial Officer        |  | October 2011              |  | None                         |  | Vice President & Chief Financial Officer of the Company
|                                             |  |                                                    |  |                           |  |                              |  |                                                        
|Daniel Saint Don
        Utah, United States |  | Vice President
        and Chief Operating Officer |  | January 2013              |  | None                         |  | Vice President & Chief Operating Officer of the Company
|                                             |  |                                                    |  |                           |  |                              |  |                                                        
|Douglas R. Stewart(5)Colorado, United States |  | Vice President and Chief Operating Officer         |  | August 2011-December 2012 |  | None                         |  | None                                                   





(1) Member of the Audit Committee.

(2) Member
of the Compensation Committee.

(3) Member
of the Nomination and Corporate Governance Committee.

(4) Member
of the Health Safety and Environment Committee.

(5) Mr.
Stewart resigned from the Company as of December 31, 2012.



Each director shall, unless he resigns
or his office becomes vacant for any reason, hold office until the close of the next annual meeting of shareholders or until his
successor is elected or appointed.



There are no family relationships between
any of the directors and officers of Atna.



There are no arrangements or understandings
with major shareholders, customers, suppliers or others, pursuant to which any person referred to above was selected as a director
or member of senior management.



The business experience, functions and
areas of experience of each director and officer, including activities performed outside the Company, are as follows:



David
H. Watkins, 68, has been a Director of the Company since 2000, he was appointed Executive Chairman in January
2009 and he stepped down as Executive Chairman becoming Chairman on July 1, 2010. Mr. Watkins has over 40 years experience in exploration,
development, and mining operations. During the early part of his career, he served as exploration geologist for Newmont and Noranda.
He later joined Falconbridge Copper Ltd. as an Exploration Geologist and rose to Chief Geologist responsible for exploration in
Quebec and mine operations at Lake Dufault and Opemiska. Mr. Watkins was appointed Vice President, Exploration in 1986 and later
became President of Minnova Inc., the successor company to Falconbridge Copper. Mr. Watkins served as President of Cyprus Exploration
and Development Corporation and Senior Vice President, Exploration for Cyprus Amax Minerals Company for six years prior to joining
Atna in 1999. Mr. Watkins served as President and CEO of Atna from 1999 to 2008.



63







Glen
D. Dickson, 63,has been a Director of the Company since 2002. Mr. Dickson
obtained his B.Sc. (Advanced) degree in Geology in 1974 and has been involved in mineral exploration continuously since then with
a variety of Canadian major and junior exploration companies.Mr. Dickson served as Senior Geologist with Asamera Minerals
Inc. from 1987 to 1992, and later served as President and Chief Executive Officer of Cumberland Resources Ltd from 1993 through
2002. Most recently, Mr. Dickson was the Chief Executive Officer and Director of Gold-Ore Resources Ltd., until it merged with
Elgin Mining Inc. on April 30, 2012. Mr. Dickson currently serves as a Director of Elgin Mining Inc.



David
K. Fagin,74, was appointed a Director of the Company on March 18, 2008. From 1992 to 1996,
he served as Chairman and CEO of Golden Star Resources Ltd. and then as non-executive Chairman for an additional two years. From
1997 to 2000, he served as Chairman and CEO of Western Exploration and Development Ltd., and later as consultant and Corporate
Director. Mr. Fagin has served as President and Director of Homestake Mining Company, Rosario Resources Corporation, and as Vice
President of AMAX Inc. He is currently Director of Pacific Rim Mining Ltd.



Christopher
E. Herald, 59, joined the Board in August 2009. He has over 30 years of experience in the mining industry
and has been President and CEO and a Director of Solitario Exploration and Royalty Corporation since 1992. Mr. Herald also serves
as Chairman of the Denver Gold Group, a non-profit mining industry association recognized for organizing the preeminent North American,
European and Asian gold precious metal forums for institutional investors. He was instrumental in discovering the 1.5 million ounce
high-grade Buckhorn Mountain Gold deposit for Crown Resources and its subsequent sale to Kinross Gold for approximately $240 million
in 2006. Chris was also responsible for the initial exploration successes of the 1.5 million ounce Kettle River open pit and underground
deposits. During his career, he has held various positions in Anaconda Minerals, Echo Bay Mines and Crown Resources.



Ronald
D. Parker, 62, was appointed a director of the Company on March 18, 2008. From 2002 to 2012, Mr. Parker
served as President and CEO of Gammill Inc, a manufacturing company. From 1998 to 2002, he served as President and CEO of Apollo
Gold Inc. Mr. Parker has held several positions with Homestake Mining Company and its subsidiaries including Vice President of
Homestake Mining Company, President of Homestake Canada, Inc., President of Prime Resources Group, Inc. and General Manager of
the McLaughlin Mine.



Paul
H. Zink, 57,joined the Company's board in April, 2011. Paul was appointed Chief Executive Officer
of Americas Bullion Royalty Corp. in March 2013. Prior to that he served as President of Eurasian Capital, the royalty and merchant
banking division of Eurasian Minerals Inc., from July 2010 through January 2013. He has more than 30 years of experience in the
financial and extractive industries. He began his career in the metals and mining industry with a 17-year tenure at J.P. Morgan
& Co., Inc., where he performed merger and acquisition analysis, banking and project finance advisory work for European mining
companies, and sell-side equity research on U.S. mining stocks. His extractive industry experience includes managing Pegasus Gold,
Inc.'s acquisition efforts and serving as Chief Financial Officer for Koch Mineral Services, a unit of Koch Industries Inc. From
2008-2010, Mr. Zink served as President and Director of International Royalty Corporation ("IRC") and was a key member
of the senior management team that negotiated IRC's successful sale to Royal Gold, Inc. in February, 2010.



James
K. B. Hesketh, 55, became President and Chief Executive Officer in January 2009. Mr. Hesketh has a diverse
career in the mining industry, with over 30 years in positions covering mining finance, corporate business development, mine operations,
mine engineering and consulting with companies including NM Rothschild & Sons (Denver) Inc., Cyprus Amax Minerals Company,
Pincock, Allen & Holt, Inc., and Dresser Industries. He has been a Director of the Company since 2001.



William R.
Stanley, 57, was appointedVice President of Exploration in 2004.  Mr. Stanley has over 35 years
experience as a mineral exploration geologist.  While the vast majority of Mr. Stanley’s exploration experience is in
the western United States, he has also developed and led international exploration efforts in Mexico, Chile, and New Zealand. Mr.
Stanley holds a Bachelor of Science degree in Geology, from Central Washington University, and a Master of Business Administration
from Arizona State University. Prior to joining Atna, Mr. Stanley was an independent mining consultant providing services to both
major and junior exploration firms. He has held positions with Cyprus Amax as the U.S. Exploration Manager, and Homestake Mining
Company as Senior Exploration Geologist where he was responsible for several gold deposit discoveries, two of which were placed
into production.



64







Rodney
D. Gloss, 56,joined Atna in October of 2011 as Vice President and Chief Financial Officer. Mr. Gloss
has an extensive background in the global mining and manufacturing sectors with experience in managing all aspects of accounting
and finance. He is an experienced and proven leader with the analytical and financial know-how to reduce costs and grow enterprises
in a profitable manner. Mr.Gloss has served as Corporate Controller for Alacer Gold; VP, Chief Accounting Officer, and Corporate
Controller for Intrepid Potash; and CFO, VP, Controller, and Director of Treasury for Timminco Ltd. Mr. Gloss holds an MBA in Finance
and Marketing from the University of California, Los Angeles and a BS in Mathematics from Northern Arizona University. He is a
CPA in the State of California.



Daniel
Saint Don, 49, joined Atna in January 2013 as Vice President and Chief Operating Officer. Daniel is a mining professional
with over 26 years of experience in Engineering, Project Management, Operations and Business Management. Mr. Saint Don has held
positions of increased responsibility in Canada and the US for DMC Mining Services, Boart Longyear, Stillwater Mining Co., Copper
Range Co, (Inmet Mining), Winston Lake, (Minnova Inc.), and International Minerals and Chemicals, (currently Mosaic). Mr. Saint
Don received a Bachelor of Science degree from Michigan Technological University in 1987. Daniel also attended the Haileybury School
of Mines in Haileybury, Ontario and received his MBA from the Gore School of Business, (Westminster College) in Salt Lake City,
Utah. Mr. Saint Don is a licensed Professional Engineer in the province of Ontario.



| | B. | Compensation
| | -- | ------------



|Name and principalposition                                                                   |  | Year |  | Fee or
        Salary
        ($) |  | Option-basedawards($)(1) |  | Non-equity
        incentive plan
        compensation
        Annual
        incentive plans
        ($)
        (1) |  | Total
        compensation
        ($)
|-------------------------------------------------------------------------------------------- |  | ---- |  | --------------------------------- |  | ------------------------ |  | --------------------------------------------------------------------------------------------------------------------- |  | --------------------------------------
|Glen D. Dickson – Director                                                                   |  | 2012 |  | 27,000                            |  | 60,264                   |  | nil                                                                                                                   |  | 87,264                                
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|David K. Fagin – Director                                                                    |  | 2012 |  | 29,000                            |  | 60,264                   |  | nil                                                                                                                   |  | 89,264                                
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|Ronald D. Parker – Director                                                                  |  | 2012 |  | 23,500                            |  | 60,264                   |  | nil                                                                                                                   |  | 83,764                                
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|Christopher E. Herald – Director                                                             |  | 2012 |  | 24,000                            |  | 60,264                   |  | nil                                                                                                                   |  | 84,264                                
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|Paul H. Zink – Director                                                                      |  | 2012 |  | 23,500                            |  | 60,264                   |  | nil                                                                                                                   |  | 83,764                                
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|David H. Watkins – Director & Chairman of the Board                                          |  | 2012 |  | 29,500                            |  | 60,264                   |  | nil                                                                                                                   |  | 89,764                                
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|James K. B. Hesketh – Director, President, Chief Executive Officer                           |  | 2012 |  | 309,774                           |  | 231,785                  |  | 75,000                                                                                                                |  | 607,559                               
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|Rodney D. Gloss – Vice President
        and Chief Financial Officer                         |  | 2012 |  | 189,170                           |  | 115,892                  |  | 40,000                                                                                                                |  | 345,062                               
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|Douglas E. Stewart – Vice President and Chief Operating Officer –  August 2011-December 2012 |  | 2012 |  | 223,188                           |  | nil                      |  | nil                                                                                                                   |  | 223,188                               
|                                                                                             |  |      |  |                                   |  |                          |  |                                                                                                                       |  |                                       
|William R. Stanley  – Vice President, Exploration                                            |  | 2012 |  | 210,374                           |  | 115,892                  |  | 40,000                                                                                                                |  | 366,266                               



65







| | (1) | Dollar amounts provided for option-based awards reflect fair value on the date of grant. Both option-based
awards and dollar amounts for annual incentive plans are determined as discussed in the Compensation Discussion and Analysis below.
| | --- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



The foregoing table and accompanying notes
set forth all compensation paid by the Company to its directors and senior management for the positions held during 2012.



No part of this compensation was paid pursuant
to a profit sharing plan. There were no amounts set aside for a pension, retirement or similar benefits plans for any director
or officer.



Termination of Employment, Change
in Responsibilities and Employment Contracts



The following summarizes the employment
agreements (the “Employment Agreements”) of Mr. Hesketh, Mr. Saint Don, Mr. Gloss and Mr. Stanley (the “Executives”).
The Employment Agreements will terminate annually on December 31st, unless sooner terminated in accordance with the provisions
of the Employment Agreements, and may be renewed for periods of one year at a time thereafter. If Atna terminates the employment
of the Executive without cause, or the Executive terminates employment for good reason (as defined in the Employment Agreements),
then the Executive will be entitled to: (i) accrued compensation including a pro rata bonus as defined in the Employment Agreement,
(ii) a severance payment equal to one year’s salary plus one month’s salary of each year of service to the Company
up to a maximum of 18 months’ salary; or if the termination by the Company without cause or by the Executive for good reason
occurs upon or within ninety days after a Change of Control, as defined in the Employment Agreements, then the severance payment
shall be equal to twenty four months of the Executive’s annual salary, (iii) the Executive is eligible to receive COBRA continuation
coverage paid by the Company for a period of up to twelve months, and (iv) subject to the terms of the Employment Agreements, all
equity awards shall vest. Atna is also obligated to pay a tax gross-up payment to cover certain excise tax imposed by Section 4999
of the Code which may be incurred in connection with a severance payment. The Employment Agreements contain a covenant not to compete
with the Company during the term of employment and for a period of one year following termination of employment, including recruitment
of any employee away from Atna.



Salary payments related to the above Employment
Agreements are based on the current salary at the time of the event. The pro rata bonus payment is based on the average payments
received by the Executive in the previous two years. The option-based payment is based on the fair value of options received in
the previous year. Assuming that an event triggered a contractual payment at the end of 2012, the following estimated maximum payments
would be required assuming a half year bonus payment.



66







|Executive Name and Title                                        |  | Maximum Employment Contract Payments |        
|--------------------------------------------------------------- |  | ------------------------------------ | -------
|James K.B. Hesketh, President and Chief Executive Officer       |  | $                                    | 966,831
|Daniel A. Saint Don, Vice President and Chief Operating Officer |  | $                                    | 478,591
|Rodney D. Gloss, Vice President and Chief Financial Officer     |  | $                                    | 538,292
|William R. Stanley, Vice President of Exploration               |  | $                                    | 580,689



No amounts have been set aside for the
Company to provide pension, retirement, or similar benefits. As for all eligible employees who elect to contribute to the Company’s
401(k) plan, the Company will match up to 4 percent of compensation.



| | C. | Board Practices
| | -- | ---------------



Election of Directors



Directors of the Company are elected at
the annual general meeting to hold office until the next general meeting or until that person ceases to be a Director before then.



No service contracts exist with the directors
providing for benefits upon termination.



Description
of Board Committees



The Board has established two full-time
committees, an audit committee (the “Audit Committee”), and the compensation committee (the “Compensation Committee”).
These committees are comprised entirely of independent non-related directors. The Board has adopted a charter with respect to its
Audit and Compensation Committees and a Code of Ethics for Officers, as more fully set forth below.



Audit Committee Charter



Purpose



The committee serves as the representative
of the Board for the general oversight of the Company’s affairs relating to:



| | · | the internal controls and management information systems of the Company;
| | - | ------------------------------------------------------------------------

| | · | the quality and integrity of the Company’s consolidated financial statements;
| | - | -----------------------------------------------------------------------------

| | · | the Company’s compliance with legal and regulatory requirements;
| | - | ----------------------------------------------------------------

| | · | the auditor’s qualifications and independence; and
| | - | --------------------------------------------------

| | · | the performance of the Company’s internal audit function and auditors.
| | - | ----------------------------------------------------------------------



Through its activities, the committee facilitates
open communication among directors, auditors and management by meeting in private sessions regularly with these parties.



The committee also provides
oversight regarding significant financial matters, including borrowing, currency exposure, dividends, share issuance and repurchases,
and the financial aspects of the Company’s benefit plans.



67







Audit Committee Membership



The Audit Committee must consist of at
least three directors. Each member of the Audit Committee must meet the listing standards relating to independence of the Toronto
Stock Exchange (the “TSX”) and all other applicable regulatory authorities. Under the Sarbanes-Oxley Act, at least
one member of the Committee must be a “financial expert,” whose qualifications include financial literacy, independence
and accounting or related financial expertise. The Audit Committee reports to the Board. A majority of the members of the committee
constitute a quorum. The following members of the Audit Committee have been appointed by and replaced at the will of the Board.



Mr. Fagin (Chairman)

Mr. Dickson

Mr. Zink



Meetings and Procedures



The Audit Committee must
convene at least four times a year, and endeavors to determine that auditing
procedures and controls are adequate to safeguard Company assets and to assess compliance with Company policies and legal requirements.



Responsibilities



The Audit Committee shall:



| | 1. | Have the sole authority to select, compensate, oversee, evaluate and, where appropriate, replace
the auditor.
| | -- | -------------------------------------------------------------------------------------------------------------

| | 2. | Annually review the management arrangements for the Company.
| | -- | ------------------------------------------------------------

| | 3. | Annually review and approve the proposed scope of each fiscal year’s internal and outside
audit at the beginning of each new fiscal year.
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------

| | 4. | Review and approve any audit and non-audit services and fees to be provided by the Company’s
auditor.
| | -- | -----------------------------------------------------------------------------------------------------

| | 5. | At or shortly after the end of each fiscal year, review with the auditor and management, the audited
consolidated financial statements and related opinion and costs of the audit of that year.
| | -- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 6. | Review funding and investment policies, implementation of funding policies and investment performance
of the Company’s benefit plans.
| | -- | -------------------------------------------------------------------------------------------------------------------------------------

| | 7. | Provide any recommendations, certifications and reports that may be required by the Exchange or
applicable regulatory authorities including the report of the Audit Committee that must be included in the Company’s annual
proxy statement.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 8. | Review and discuss the annual audited consolidated financial statements and quarterly consolidated
financial statements with management and the auditor.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------

| | 9. | Have the authority to engage independent counsel and other advisers as it determines necessary
to carry out its duties. The Company shall provide for appropriate funding, as determined by the Audit Committee, in its capacity
as a committee of the Board, for payment of compensation to any advisers employed by the Audit committee and to the auditor employed
by the Company for the purpose of rendering or issuing an audit report.
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 10. | Discuss with management and the auditor the Company’s policies with respect to risk assessment
and risk management.
| | --- | -------------------------------------------------------------------------------------------------------------------

| | 11. | Meet separately, periodically, with management and the auditor.
| | --- | ---------------------------------------------------------------

| | 12. | In consultation with the auditor and management, review the integrity of the Company’s financial
reporting process.
| | --- | -------------------------------------------------------------------------------------------------------------------

| | 13. | Review periodically the effect of regulatory and accounting initiatives, as well as off-balance
sheet structures, on the consolidated financial statements of the Company.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 14. | Review with the auditor:
| | --- | ------------------------



68







(a) any audit problems or other
difficulties encountered by the auditor in the course of the audit process, including any restrictions on the scope of the auditor’s
activities or on access to requested information, and any significant disagreements with management; and

(b) management’s
responses to such matters.

| | 15. | Review and discuss with the auditor the responsibility, budget and staffing of the Company’s
internal audit function.
| | --- | ---------------------------------------------------------------------------------------------------------------------

| | 16. | Report regularly to the Board. Such report to the Board may take the form of an oral report by
the Chairman or any other member of the Audit Committee designated by the Audit Committee to make such report.
| | --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | 17. | Perform a review and evaluation, at least annually, of the performance of the Audit committee.
In addition, the Audit Committee shall review and reassess, at least annually, the adequacy of this Charter and recommend to the
Board any improvements to this Charter that the Audit Committee considers necessary or valuable. The Audit Committee shall conduct
such evaluations and reviews in such manner as it deems appropriate.
| | --- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Compensation Committee Charter



I.	Mandate
The mandate of the Compensation Committee (the "Committee") is to discharge the responsibilities of the Board relating
to compensation of Atna's officers and directors, to provide general oversight of Atna's compensation structure including equity
compensation plans and benefits programs and to perform the additional specific duties and responsibilities set out herein.



II.	Membership
The Compensation Committee will consist of at least two members, a majority of whom will be independent directors of Atna, and
one of whom will act as chairperson. An "independent" director is a director who is independent, as determined by the
Board, within the definitions prescribed for executive compensation committee members by applicable stock exchange listing standards,
and applicable laws and, if and as applicable, SEC rules. Compensation Committee members will be appointed, and the Chairperson
of the Compensation Committee will be selected from among them, by the Board of Directors.



Members are as follows:



Mr. Glen Dickson- Chairman



Mr. Ronald Parker



Mr. Christopher Herald



III.	Meetings and Procedures
The Compensation Committee will meet as often as may be considered necessary or appropriate, in its judgment. The Committee may
meet either in person or by telephone, and at such times and places as the Committee determines. At least two members of the Committee
must be present to constitute a quorum for the transaction of Compensation Committee business. The Chairperson will preside over
the meetings, but will have no greater voting rights or decision-making authority than the other member(s) of the Compensation
Committee. The Compensation Committee will report regularly to the full Board with respect to its activities. As a matter of practice,
the Compensation Committee will discuss significant matters, as determined by the Committee, with the full Board prior to taking
final action on such matters. All recommendations of the Compensation Committee with respect to the awarding of compensation to
the executive (senior) officers of the Company will be submitted to the full Board for approval before implementation.



69







IV.	Outside Advisers
The Compensation Committee will have the authority, acting reasonably, to retain, at the Company's expense, such outside consultants,
legal counsel, and other advisors as it determines is appropriate to assist it in the full performance of its functions, including
the authority to approve such advisors' fees and other engagement terms. The Compensation Committee will notify the Board prior
to retaining any outside consultant, legal counsel, or advisor.



V.	Duties and Responsibilities



(a)	Human Resources and
Compensation Strategies. The Compensation Committee will oversee and evaluate Atna's overall human resources and compensation
structure, policies and programs, with the objective of ensuring that these establish appropriate incentives and leadership development
for management and other employees.



(b)	Executive Compensation.
The Compensation Committee will review and approve corporate goals and objectives relevant to the compensation of the President,
Chief Executive Officer, Chief Financial Officer, Chief Operating Officer, and the other executive officers of Atna, evaluate the
performance of the President, CEO, CFO, COO and the other executive officers in light of those goals and objectives and approve
their annual compensation levels, including salaries, bonuses, and stock option grants based on such evaluation.



(c)	Employment Agreements.
The Compensation Committee will review and approve all employment related agreements and severance arrangements for the President,
CEO, CFO, COO, and other executive officers, including, without limitation, change-of-control agreements.



(d)	External Reporting
of Compensation Matters. The Compensation Committee will prepare an annual report on executive officer compensation for publication
in Atna's proxy circulars, as required by the securities regulatory authorities having jurisdiction over the Company. The Chairperson
of the Compensation Committee will make him or herself available for questions from shareholders of the Company at the Company's
Annual General Meeting.



(e)	Stock Option and Incentive
Compensation Plans. The Compensation Committee will supervise and administer Atna's stock option or any other equity-based
compensation programs, and the incentive compensation plan, and may approve, amend, modify, interpret, ratify the terms of, or
terminate any such plan, to the extent that such plans and applicable laws so permit, and will make recommendations to the Board
with respect to equity-based plans and incentive-compensation plans as appropriate.



(f)	Employee Benefit Plans.
The Compensation Committee will monitor the effectiveness of benefit plan offerings, in particular benefit plan offerings pertaining
to executive officers, and will review and approve any new employee benefit plan or change to an existing plan that creates a material
financial commitment by Atna. In its discretion, the Compensation Committee may otherwise approve, amend, modify, ratify, interpret
the terms of, or terminate any benefit plan.



(g)	Leadership Development
and Succession Planning. The Compensation Committee will review the leadership development and succession planning processes
for senior management positions and ensure that appropriate compensation, incentive and other programs are in place in order to
promote appropriate leadership development.



70









(h)      Director
Compensation. The Compensation Committee will annually review the compensation of directors for service on the Board and its
committees and recommend to the Board the annual board member compensation package, including retainer, committee member and chair
retainers, board and committee meeting attendance fees and any other form of compensation, such as stock option grants or stock
awards.



(i)       Annual
Evaluation. The Compensation Committee will annually evaluate the performance of the Compensation Committee and the adequacy
of the Compensation Committee's charter and recommend to the Board such changes as it deems appropriate.



(j)       General.
The Compensation Committee will perform such other duties and responsibilities as are consistent with the purpose of the Compensation
Committee and as the Board or the Compensation Committee deems appropriate.



| | VI. | Delegation
| | --- | ----------



The Compensation Committee may delegate
any of the foregoing duties and responsibilities to one or more members of the Compensation Committee. In addition, the Compensation
Committee may delegate to one or more executive officers of the Company the administration of equity incentive or employee benefit
plans, unless otherwise prohibited by such plans, or applicable law or stock exchange rules. Any such delegation may be revoked
by the Compensation Committee at any time.



| | D. | Employees
| | -- | ---------



As of December 31, 2012, the Company had
approximately 161 full-time and part-time employees. The following table provides information on the activity and geographical
location of the Company’s employees and contractors.



|Activity               |  | Geographical Location |  | Number of Employees at December 31, 2012 |  | Average Number of Contractors in 2012
|---------------------- |  | --------------------- |  | ---------------------------------------- |  | -------------------------------------
|Corporate headquarters |  | Colorado USA          |  | 12                                       |  | 1                                    
|Briggs                 |  | California USA        |  | 128                                      |  | 12                                   
|Reward                 |  | Nevada USA            |  | 2                                        |  | -                                    
|Pinson                 |  | Nevada USA            |  | 15                                       |  | 31                                   
|Kendall                |  | Montana USA           |  | 4                                        |  | -                                    



| | E. | Share Ownership
| | -- | ---------------



The following table sets forth the share
ownership of those persons listed in subsection 6B above and includes details of all options to purchase common shares of the Company
held by such persons at March 20, 2013.



|Name            |  | #
of Common(3) Shares Held |         |  | Number of
 Stock Options |  |         | Exercise Price Canadian Dollars$ |  |  | Expiry Date
|--------------- |  | -------------------------- | ------- |  | ------------------------ |  | ------- | -------------------------------- |  |  | -----------
|Glen D. Dickson |  |                            | 188,000 |  |                          |  | 150,000 | (1)                              |  |  | 0.45       
|                |  |                            |         |  |                          |  | 120,000 | (1)                              |  |  | 0.71       
|                |  |                            |         |  |                          |  | 120,000 | (2)                              |  |  | 0.60       
|                |  |                            |         |  |                          |  | 150,000 | (2)                              |  |  | 0.90       
|                |  |                            |         |  |                          |  | 130,000 | (2)                              |  |  | 1.13       





71







|Name                  |  | #
of Common(3) Shares Held |           |  | Number of
 Stock Options |  |         | Exercise Price Canadian Dollars$ |  |  | Expiry Date
|--------------------- |  | -------------------------- | --------- |  | ------------------------ |  | ------- | -------------------------------- |  |  | -----------
|David K. Fagin        |  |                            | 188,536   |  |                          |  | 120,000 | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 120,000 | (2)                              |  |  | 0.60       
|                      |  |                            |           |  |                          |  | 150,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 130,000 | (2)                              |  |  | 1.13       
|Ronald D. Parker      |  |                            | 26,496    |  |                          |  | 150,000 | (1)                              |  |  | 0.45       
|                      |  |                            |           |  |                          |  | 120,000 | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 120,000 | (2)                              |  |  | 0.60       
|                      |  |                            |           |  |                          |  | 150,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 130,000 | (2)                              |  |  | 1.13       
|Christopher E. Herald |  |                            | 60,000    |  |                          |  | 40,000  | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 120,000 | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 120,000 | (2)                              |  |  | 0.60       
|                      |  |                            |           |  |                          |  | 150,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 130,000 | (2)                              |  |  | 1.13       
|Paul H. Zink          |  |                            | 50,000    |  |                          |  | 100,000 | (2)                              |  |  | 0.52       
|                      |  |                            |           |  |                          |  | 150,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 130,000 | (2)                              |  |  | 1.13       
|David H. Watkins      |  |                            | 1,574,880 |  |                          |  | 120,000 | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 120,000 | (2)                              |  |  | 0.60       
|                      |  |                            |           |  |                          |  | 150,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 130,000 | (2)                              |  |  | 1.13       
|James K. B. Hesketh   |  |                            | 334,370   |  |                          |  | 150,000 | (1)                              |  |  | 0.45       
|                      |  |                            |           |  |                          |  | 400,000 | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 400,000 | (2)                              |  |  | 0.60       
|                      |  |                            |           |  |                          |  | 500,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 500,000 | (2)                              |  |  | 1.13       
|Rodney D. Gloss       |  |                            | 20,150    |  |                          |  | 200,000 | (2)                              |  |  | 0.75       
|                      |  |                            |           |  |                          |  | 75,000  | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 250,000 | (2)                              |  |  | 1.13       
|William R. Stanley    |  |                            | 285,000   |  |                          |  | 200,000 | (1)                              |  |  | 0.45       
|                      |  |                            |           |  |                          |  | 200,000 | (1)                              |  |  | 0.71       
|                      |  |                            |           |  |                          |  | 200,000 | (2)                              |  |  | 0.60       
|                      |  |                            |           |  |                          |  | 300,000 | (2)                              |  |  | 0.90       
|                      |  |                            |           |  |                          |  | 250,000 | (2)                              |  |  | 1.13       



| | (1) | This option grant is fully vested.
| | --- | ----------------------------------

| | (2) | These option grants vest 1/3 on the grant date and 1/3 each year over the next two anniversary
dates.
| | --- | -----------------------------------------------------------------------------------------------------

| | (3) | At March 20, 2013, persons listed in item 6B above independently owned less than two percent of
the Company’s shares outstanding and collectively own two percent of the shares outstanding.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



72







Incentive Stock Options Plan



In 2007, the Company adopted an incentive
stock option plan pursuant to the policies of the TSX with the approval of the Company’s shareholders, which plan was amended
in 2008 and 2009 (as amended the “Option Plan”). A copy of the Option Plan is available upon request from the Corporate
Secretary of the Company, 14142 Denver West Parkway - Suite 250, Golden, Colorado, 80401. Key provisions of the Option Plan include:



| | · | persons who are eligible to receive options pursuant to the Option Plan are directors, officers
and employees of the Company and its subsidiaries and others providing management or consulting services to the Company or an entity
controlled by the Company;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | a restriction that the maximum number of common shares issuable pursuant to options granted under
the Option Plan will be a number equal to 10 percent of the issued and outstanding common shares on a non-diluted basis at any
time;
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | a restriction that no more than 10 percent of the total number of issued and outstanding common
shares on a non-diluted basis may be issuable to insiders of the Company pursuant to options granted to insiders under the Option
Plan;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | a restriction that no more than 10 percent of the total number of issued and outstanding common
shares on a non-diluted basis are issued to insiders of the Company within any one-year period pursuant to options granted to insiders
under the Option Plan;
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | the option price per common share is to be determined by the Board provided that such exercise
price is not less than the market price on the date of grant of such options or such other minimum price as may be required by
the TSX and the options may be priced in Canadian or U.S. Dollars as determined by the Board at the time the option is granted;
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | the market price is defined as the average of the daily high and low board lot trading prices of
the common shares of the Company for three trading days immediately preceding the time the option is granted;
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | the vesting period of all options are determined by the Board;
| | - | --------------------------------------------------------------



| | · | options may be exercisable for a period of up to a maximum term of five years, subject to a blackout
period allowance, such period to be determined by the Board, and the options are non-transferable;
| | - | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | options held by individuals who are terminated without cause are subject to an accelerated expiry
term for those options which requires that options held by those individuals expire on the earlier of: (a) the original expiry
term of such options; (b) 30 days after the Optionee ceases active employment with the Company; or (c) 30 days after the date of
delivery of written notice of retirement, resignation or termination;
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | options held by an individual who ceases to be employed by the Company for cause or is removed
from office or becomes disqualified from being a director will terminate immediately;
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | options held by an individual who ceases to be employed by the Company due to death, disability
or retirement in accordance with the Company’s retirement policy will terminate on the earlier of: (a) 365 days after the
date of death, disability or retirement; and (b) the original expiry term of such options;
| | - | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



73







| | · | options which expire unexercised or are otherwise cancelled will be returned to the Option Plan
and may be made available for future option grant pursuant to the provisions of the Option Plan;
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | optionees may, rather than exercise their options, elect to terminate such option, in whole or
in part, and receive the number of common shares, which have a value equivalent to the number of options terminated multiplied
by the difference between the fair value of a common share and the option price of the options terminated;
| | - | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | the Board may, without shareholder
approval,from time to time, subject to applicable law and the prior approval, if required, of the TSX or any other applicable
regulatory body: (i) suspend, terminate, ordiscontinue the Option Plan, and (ii) amend or revise the terms
of any option without the consent of the optionee, provided that such amendment does not adversely alter or impair the- option
(except as permitted under the adjustment provisions of the Option Plan), including amendments of a typographical, grammatical,
clerical or administrative nature, to the vesting provisions of the Option Plan or any option, to change the termination provisions
of any option that does not entail an extension beyond the original expiration date of the option and to change the eligible participants
under the Option Plan; and
| | - | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | · | options issued to eligible U.S. Participants (as defined in the Option Plan) may qualify as an
“incentive stock option” pursuant to Section 422 of the Code.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------



The rules of the TSX provide that a listed
issuer having in place an evergreen plan such as the Option Plan must obtain shareholder approval within three years after the
institution of the plan and every three years thereafter in order to continue to grant awards under it. The Company’s shareholders
last approved the renewal of the Option Plan on June 7, 2010 and will request its shareholders to approve the renewal of the Option
Plan at the Annual General Meeting to be held on May 7, 2013. In addition, at the 2013 Annual General Meeting, the shareholders
will be asked to approve proposed amendments to the Option Plan to accommodate the introduction of a proposed Restricted Share
Unit Plan.



Maximum Shares Available



The maximum number of common shares of
Atna that may be issuable under the Option Plan is a number equal to 10 percent of the number of issued and outstanding common
shares of Atna on a non-diluted basis at any time. As of March 20, 2013, the maximum number of common shares issuable under the
Option Plan was 14,514,046. As of March 20, 2013, approximately 9,152,835 common shares were issuable upon the exercise of outstanding
options issued under the Option Plan leaving 5,361,211 common shares reserved for future issuance of the Option Plan.



Maximum Shares Available to Insiders



To ensure that insiders of Atna have the
opportunity to vote on certain approvals listed in Section 613(a) of the TSX Company Manual, the Option Plan restricts the
maximum number of common shares of Atna that under the Option Plan are issued, or that may be issuable, to insiders (as defined
under applicable securities law). Under the Option Plan, no more than 10 percent of the total number of issued and outstanding
common shares on a non-diluted basis may be: (i) issuable to insiders of Atna pursuant to options granted to insiders under
the Option Plan; or (ii) issued to insiders of Atna within any one year period pursuant to options granted to insiders under
the Option Plan, in both cases together with all of Atna’s previously established and outstanding or proposed share compensation
arrangements.



74







Share Appreciation Rights



The Option Plan includes the concept of
share appreciation rights. Under the share appreciation rights, upon exercise, optionees have the right to receive a certain number
of common shares calculated pursuant to the difference between the fair value of a common share and the option exercise price.



Amending Provisions



The amending provisions in the Option Plan
provide that the Board may, from time to time, subject to the Option Plan, applicable law and the prior approval, if required,
of the TSX or any other regulatory body having authority, or of the shareholders of Atna, suspend, terminate, discontinue or amend
the Option Plan. The Board may not amend the Option Plan without the approval of the shareholders of Atna and the TSX with respect
to the following; (a) altering the maximum number of shares available under the Option Plan; (b) amending the terms of
an option granted to an insider of Atna; (c) extending the expiration term from a blackout period allowance; (d) making
a change to the class of eligible participants which would have the potential of broadening or increasing participation by insiders;
(e) adding any form of financial assistance; or (f) adding a deferred or restricted share unit or any other provision
which results in an eligible participant receiving common shares while no cash consideration is received by Atna.



Exchange Controls



Atna is a Province of British Columbia,
Canadian corporation. There is no law or governmental decree or regulation in Canada that restricts the export or import of capital,
or affects the remittance of dividends, interest or other payments to a non-resident holder of common shares, other than withholding
tax requirements. Any such remittances to United States residents are generally subject to withholding tax, however no such remittances
are likely in the foreseeable future.



There is no limitation imposed by the laws
of Canada or by the charter or other constituent documents of Atna on the right of a non-resident to hold or vote its common shares,
other than as provided in the Investment Canada Act (Canada) (the “Investment Act”). The following discussion summarizes
the material features of the Investment Act for a non-resident who proposes to acquire a controlling number of Atna’s common
shares. It is general only, it is not a substitute for independent advice from an investor’s own advisor, and it does not
anticipate statutory or regulatory amendments. Atna does not believe the Investment Act will have any effect on it or on its non-Canadian
shareholders due to a number of factors including the nature of its operations and Atna’s relatively small capitalization.



The Investment Act generally prohibits
implementation of a “reviewable” investment by an individual, government or agency thereof, corporation, partnership,
trust or joint venture (each an “entity”) that is not a “Canadian” as defined in the Investment Act (i.e.
a “non-Canadian”), unless after review the Director of Investments appointed by the minister responsible for the Investment
Act is satisfied that the investment is likely to be of net benefit to Canada. The size and nature of a proposed transaction may
give rise to an obligation to notify the Director to seek an advance ruling. An investment in Atna’s common shares by a non-Canadian
(other than a “WTO Investor” as that term is defined in the Investment Act and which term includes entities which are
nationals of or are controlled by nationals of member states of the World Trade Organization) when Atna was not controlled by a
WTO Investor, would be reviewable under the Investment Act if it was an investment to acquire control of Atna and the value of
the assets of Atna, as determined in accordance with the regulations promulgated under the Investment Act, was over a certain figure,
or if an order for review was made by the federal cabinet on the grounds that the investment related to Canada’s cultural
heritage or national identity, regardless of the value of the assets of Atna. An investment in the common shares by a WTO Investor,
or by a non-Canadian when Atna was controlled by a WTO Investor, would be reviewable under the Investment Act if it was an investment
to acquire control of Atna and the value of the assets of Atna, as determined in accordance with the regulations promulgated under
the Investment Act, was not less than a specified amount, which currently exceeds approximately C$250 million. A non-Canadian would
acquire control of Atna for the purposes of the Investment Act if the non-Canadian acquired a majority of the common shares. The
acquisition of less than a majority but one-third or more of the common shares would be presumed to be an acquisition of control
of Atna unless it could be established that, on the acquisition, Atna was not controlled in fact by the acquirer through the ownership
of the common shares.



75







The foregoing assumes Atna will not engage
in the production of uranium or own an interest in a producing uranium property in Canada, or provide any financial service or
transportation service, as the rules governing those businesses are different.



Certain transactions relating to the common
shares of Atna would be exempt from the Investment Act, including:



| | (a) | an acquisition of the common shares by a person in the ordinary course of that person’s business
as a trade or dealer in securities,
| | --- | ------------------------------------------------------------------------------------------------------------------------------------

| | (b) | an acquisition of control of Atna in connection with the realization of security granted for a
loan or other financial assistance and not for a purpose related to the provisions of the Investment Act, and
| | --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

| | (c) | an acquisition of control of Atna by reason of an amalgamation, merger, consolidation or corporate
reorganization following which the ultimate direct or indirect control in fact of Atna, through the ownership of the common shares,
remain unchanged.
| | --- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Quantitative and Qualitative Disclosures of Market Risk



Refer to the discussion of
quantitative and qualitative disclosures of market risk in Item 11.



| | ITEM 7. | MAJOR SHAREHOLDERS AND RELATED PARTY TRANSACTIONS
| | ------- | -------------------------------------------------



| | A. | Major Shareholders
| | -- | ------------------



To the knowledge of the Company, and based
upon the Company’s review of current public filings, as at March 20, 2013, there are no known shareholders who beneficially
owned, directly or indirectly, or exercised control or direction over more than five percent of the voting rights.



On December 31, 2011, Sheldon Inwentash
and Associates is believed to have beneficially owned approximately 11,400,000 shares, 9.4 percent of the outstanding shares. In
February 2012, Sheldon Inwentash and Associates filed a report indicating that firm held 11,565,000 shares, 7.9 percent of the
now outstanding shares, but nothing more recent has been filed. As of December 31, 2011, Hedgehog Capital is believed to have beneficially
owned approximately 13,200,000 shares, 8.8 percent of the outstanding shares, however in a December 31, 2012 filing, Hedgehog Capital
indicated beneficial ownership had declined to 6,700,000 shares, 4.6 percent of the now outstanding shares. These named shareholders
did not possess voting rights different from those of other Company shareholders. Both Hedgehog Capital and Sheldon Inwentash and
Associates acquired the common shares of the Company in the public market.



76







To the knowledge of the Company and based
on current public filings as well as information provided by the Company’s transfer agent, the table below is the distribution
of the shareholders of the Company at February 28th 2013.



|Country         |  | Total Holders |      |  | Holders percent |  |       | Total Holdings |  |  | Holdings percent | 
|--------------- |  | ------------- | ---- |  | --------------- |  | ----- | -------------- |  |  | ---------------- | 
|                |  |               |      |  |                 |  |       |                |  |  |                  | 
|Canada          |  |               | 3290 |  |                 |  | 35.09 |                |  |  | 62,258,644       | 
|                |  |               |      |  |                 |  |       |                |  |  |                  | 
|USA             |  |               | 5937 |  |                 |  | 63.33 |                |  |  | 64,357,394       | 
|                |  |               |      |  |                 |  |       |                |  |  |                  | 
|Other Countries |  |               | 148  |  |                 |  | 1.58  |                |  |  | 18,524,428       | 



The Company is not directly or indirectly
owned or controlled by another corporation, by any foreign government, or by any other natural or legal person severally or jointly.
The Company knows of no arrangements, the operation of which may at a subsequent date result in a change in control of the Company.



| | B. | Related Party Transactions
| | -- | --------------------------



During 2012 and 2011, and through the date
of this report, the Company had no related party transactions.



Indebtedness to Company of Directors,
Executive Officers and Senior Officers



No directors or senior officers of the
Company are indebted to the Company or have been financially indebted to the Company since the beginning of the last full fiscal
year of the Company.



| | C. | Interests of Experts and Counsel
| | -- | --------------------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.

EKS&H LLLP,
auditors of the Company, has advised the Company that it is independent within the Rules of Professional Conduct of the Institute
of Chartered Accountants of British Columbia and within the meaning of applicable securities laws of Canada.



NeitherEKS&H
LLLP, or any director, officer, employee, or partner, as applicable, thereof is currently expected to
be elected, appointed or employed as a director, officer or employee of the Company or of any associate or affiliate of the Company.



| | ITEM 8. | FINANCIAL INFORMATION
| | ------- | ---------------------



| | A. | Consolidated Financial Statements and Other Financial Information
| | -- | -----------------------------------------------------------------



Attached hereto as Exhibit 15.1 (i) to
(vi) are the audited consolidated financial statements of the Company for the fiscal years ended December 31, 2012, 2011 and 2010.
The consolidated financial statements are accompanied by auditors' reports and related notes. See “Item 18. Financial Statements.”



Legal Proceedings



As of March 20, 2013, there are no legal
or arbitration proceedings, which may have, or have had in the recent past, significant effects on the Company’s financial
position or profitability.



77







Dividend Distributions



The Company is permitted to pay dividends
under its governing documents. The Company has no current plans to pay any dividends.



| | B. | Significant Changes
| | -- | -------------------



Changes in Accounting Policies



International Financial Reporting
Standards:The Canadian Accounting Standards Board (“AcSB”) confirmed in February
2008 that IFRS would replace Canadian GAAP for public enterprises for financial periods beginning on and after January 1, 2011.The Company adopted IFRS effective January 1, 2011; presented the opening IFRS balance sheet as of January 1, 2010 (the
“Transition Date”) within the 2011 financials; and restated the 2010 results in accordance with IFRS. An
explanation of how the transition from Canadian GAAP to IFRS affected the Company’s financial position, financial performance
and cash flows is set out in the footnotes to the 2011 financial statements, previously disclosed. As all periods shown in the
2012 financial statements are comparable and the changes to the 2010 statements were previously disclosed, no reconciliation is
provided in the 2012 financial statements or footnotes.



In preparing
its opening IFRS balance sheet at January 1, 2010, the Transition Date, the Company adjusted amounts reported previously under
Canadian GAAP. Under IFRS 1, standards are applied retrospectively at the Transition Date with all adjustments to assets and liabilities
taken to retained earnings unless certain exemptions are applied.IFRS 1 provides for exemptions and elections that help
to facilitate the transition to IFRS. The Company chose to apply the following optional exemptions.



Business combinations: The Company
elected the business combinations exemption to not apply IFRS 3 retrospectively to past business combinations. Accordingly the
Company has not restated past business combinations that took place prior to the Transition Date.



Fair value or revaluation as deemed
cost: The Company elected not to re-measure any of its PP&E at fair value or revalue amounts at deemed cost previously
determined under Canadian GAAP as of the Transition Date.



Cumulative translation adjustments:The Company elected to zero-out the ending balance in the accumulated translation account as of the Transition Date and record
the balance in retained earnings.



Recent Accounting Pronouncements



Following are the recently issued accounting
standards relevant to our Company and business that may impact the Company in the future. It includes standards that have been
recently adopted or ones that have been issued and not yet adopted.



IFRS 9 – Financial Instruments– On November 12, 2009, the IASB issued IFRS 9 Financial Instruments as the first step in its project to replace
International Accounting Standard (“IAS”) 39 Financial Instruments: Recognition and Measurement.IFRS 9 retains
but simplifies the mixed measurement model and establishes two primary measurement categories for financial assets: amortized
cost and fair value. The basis of classification is made at the time the financial asset is initially recognized, namely when
the entity becomes a party to the contractual provisions of the instrument. IFRS 9 amends some of the requirements of IFRS 7 Financial
Instruments: Disclosuresincluding additional disclosures about investments in equity instruments measured at fair value in
other comprehensive income, and guidance on financial liabilities and de-recognition of financial instruments. Although early
adoption is permitted, in December 2011, the IASB issued an amendment that adjusted the mandatory effective date of IFRS 9 from
January 1, 2013 to January 1, 2015. The Company is currently determining the impact of adopting IFRS 9.



78







IFRS 10 – Consolidated Financial
Statements –On May 12, 2011, the IASB issued IFRS 10 Consolidated Financial Statements,which supersedes SIC-12
Consolidation – Special Purpose Entities.IFRS 10 establishes principles for the presentation and preparation of consolidated
financial statements when an entity controls one or more other entities. It requires a parent entity to present consolidated financial
statements, define the principle of control to identify whether it must consolidate an investee, and set out the accounting requirements
for the preparation of consolidated financial statements. Management has determined this has no present bearing on the Company.



IFRS 11 – Joint Arrangements
–On May 12, 2011, the IASB issued IFRS 11 Joint Arrangements,which supersedes SIC-12 Jointly Controlled
Entities – Non-Monetary Contributions by Venturers.The core principle of IFRS 11 is that a party to a joint arrangement
determines the type of joint arrangement by assessing its rights and obligations and accounts for those rights and obligations,
rather than accounting for the legal form of the arrangement. IFRS 11 must be applied starting January 1, 2013, with early adoption
permitted. Management has early-adopted the standard and has determined adoption requires no changes to the already existing Company
practices.



IFRS 12 – Disclosure of Interests
in Other Entities –On May 12, 2011, the IASB issued IFRS 12 Disclosure of Interests in Other Entities.IFRS
12 requires a parent company to disclose information that enables users of financial statements to evaluate the nature of, and
risks associated with, its interests in other entities and the effects of those interests on its financial position, financial
performance and cash flows. IFRS 12 must be applied starting January 1, 2013, with early adoption permitted. Management has early-adopted
the standard and has determined adoption has no present impact.



IFRS 13 – Fair Value Measurement
–On May 12, 2011, the IASB issued IFRS 13 Fair Value Measurement.IFRS 13 defines fair value, sets out a single
IFRS framework for measuring fair value, and requires disclosures about fair value measurements, based on a fair value hierarchy.
IFRS 13 must be applied starting January 1, 2013, with early adoption permitted. Management has early-adopted the standard and
has determined adoption has no present impact.



IFRIC 20 – Stripping Costs in
the Production Phase of a Surface Mine –In October 2011, the IASB issued IFRIC 20 Stripping Costs in the Production
Phase of a Surface Mine.IFRIC 20 provides guidance on the accounting for the costs of stripping activity in the production
phase of surface mining when two benefits accrue to the entity from the stripping activity: usable ore that can be used to produce
inventory and improved access to further quantities of material that will be mined in future periods. The Company adopted IFRIC
20 Stripping Costs in the Production Phase of a Surface Mineon the Company’s opening IFRS balance sheet date of January
1, 2010.



| | ITEM 9. | THE OFFER AND LISTING
| | ------- | ---------------------



| | A. | Offer and Listing Details
| | -- | -------------------------



The high and low closing prices in Canadian
Dollars for the Company’s common stock on the TSX:ATN, expressed in Canadian dollars and on the OTCBB:ATNAF, in U. S. Dollars,
are set forth below.



79







For the five most recent full financial years:
the annual high and low market prices:



| |      |  | TSX      |  |      | OTCQB   | 
| | ---- |  | -------- |  | ---- | ------- | 
| |      |  | High - $ |  |      | Low - $ | 
| |      |  |          |  |      |         | 
| | 2008 |  |          |  | 1.75 |         | 
| | 2009 |  |          |  | 0.94 |         | 
| | 2010 |  |          |  | 0.75 |         | 
| | 2011 |  |          |  | 0.98 |         | 
| | 2012 |  |          |  | 1.49 |         | 



For the two most recent full financial
years and any subsequent period: the high and low market prices for each full financial quarter follow:



|                                |  | TSX      |      |  | OTCQB   | 
|------------------------------- |  | -------- | ---- |  | ------- | 
|                                |  | High - $ |      |  | Low - $ | 
|Fiscal 2011                     |  |          |      |  |         | 
|First Quarter, ended 03/31/11   |  |          | 0.68 |  |         | 
|Second Quarter, ended 06/30/11  |  |          | 0.65 |  |         | 
|Third Quarter, ended 9/30/2011  |  |          | 0.95 |  |         | 
|Fourth Quarter, ended 12/31/11  |  |          | 0.98 |  |         | 
|                                |  |          |      |  |         | 
|Fiscal 2012                     |  |          |      |  |         | 
|First Quarter, ended  03/31/12  |  |          | 1.49 |  |         | 
|Second Quarter, ended 06/30/12  |  |          | 1.28 |  |         | 
|Third Quarter, ended  09/30/12  |  |          | 1.32 |  |         | 
|Fourth Quarter, ended  12/31/12 |  |          | 1.35 |  |         | 
|                                |  |          |      |  |         | 
|Fiscal 2013                     |  |          |      |  |         | 
|Period ended 03/20/13           |  |          | 1.29 |  |         | 



For the most recent six months: the high
and low market prices and the average daily trading volumes for each month.



|                 |  | TSX      |      |  | OTCQB   | 
|---------------- |  | -------- | ---- |  | ------- | 
|                 |  | High - $ |      |  | Low - $ | 
|March 1-20, 2013 |  |          | 0.95 |  |         | 
|February-13      |  |          | 1.13 |  |         | 
|January-13       |  |          | 1.29 |  |         | 
|December12       |  |          | 1.19 |  |         | 
|November12       |  |          | 1.35 |  |         | 
|October12        |  |          | 1.37 |  |         | 
|September-12     |  |          | 1.33 |  |         | 



| | B. | Plan of Distribution
| | -- | --------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



80







| | C. | Markets
| | -- | -------



The Company’s common shares have
been listed and traded in Canada on the TSX under the symbol “ATN” since March 14, 1996. The Company is also traded
on the OTC Bulletin Board in the U.S. under the symbol “ATNAF”.



| | D. | Selling Shareholders
| | -- | --------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | E. | Dilution
| | -- | --------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | F. | Expenses of the Issue
| | -- | ---------------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | ITEM 10. | ADDITIONAL INFORMATION
| | -------- | ----------------------



| | A. | Share Capital
| | -- | -------------



This Form 20-F is being filed as an annual
report under the Exchange Act and, as such, there is no requirement to provide any information under this item.



| | B. | Memorandum and Articles of Association
| | -- | --------------------------------------



The information required by this Item
10.B is contained in the Company's registration statements on Form 20-FR filed under the Exchange Act with
the SEC on June 23, 1997 and on Form F-4/A (File No. 333-147973) filed under the Securities Act with the SEC on January 17, 2008,
including any amendments or reports filed for the purpose of updating such description.



| | C. | Material Contracts
| | -- | ------------------



During the two years preceding this report,
the following are considered to be material contracts entered, all of which have to do with developing and bringing into operation
the Pinson mine: 1) the acquisition of the 70 percent interest in Pinson in September of 2011, 2) the related C$20 million financing
of the Pinson acquisition with Sprott in August of 2011 as amended in February 2012 and in March 2013, and 3) the DMC Mining Services
Agreement with Pinson in December 2011.



In April 2009, Atna entered into a Mining
Venture Agreement (the “MVA”) for Pinson with Pinson Mining Company ("PMC"), a subsidiary of Barrick Gold
Corporation, superseding a prior Exploration and Development Agreement. Under the MVA, Atna owned a 30 percent equity interest
in the joint venture and PMC owned 70 percent. The joint venture spent over $50 million on drilling and development work at Pinson
from 2004 through 2011. In September 2011, Atna completed an Asset Purchase and Sale Agreement (“APSA”) with PMC
to acquire PMC’s 70 percent interest in the Pinson. The MVA was terminated by the APSA.



81







Upon closing of the APSA, Atna became the
owner of four square miles of land containing the historic Pinson Mine and the related mineral resources. PMC became sole owner
of 21 square miles of land and claims surrounding the four sections of land. As part of this transaction Atna also signed a non-exclusive
Ore Milling and Gold Purchase Agreement with an affiliate of PMC allowing Atna, at its option, to process Pinson sulfide ores at
Barrick's Goldstrike Plant. PMC retained a 10 percent, net profits royalty on production after the first 120,000 ounces of gold
are sold. Exclusive of the qualitative value of this processing agreement and future royalty payments to PMC, Atna paid $27.9 million
for the 70 percent interest in Pinson inclusive of: $15.0 million in cash, 15 million common shares of Atna, $1.5 million in assumed
reclamation obligations, and the net exchange of land.



On August 31, 2011, the Company closed
a C$20 million Credit Agreement with Sprott to finance the Pinson acquisition and commence development. C$2.5 million was repaid
to Sprott in February 2013. As amended in February of 2012 and March of 2013, repayments of the remaining C$17.5 million principal
balance are due in 12 equal monthly installments of C$1.46 million starting September 30, 2013. Interest on unpaid principal balances
accrues at annual rate of nine percent per annum compounded monthly. Atna paid a structuring fee of C$150,000 and, as consideration
for advancing the facility, paid an arrangement fee of C$0.7 million. The arrangement fee was paid with common shares of Atna determined
on the basis of a price per share equal to a 10 percent discount to the five-day volume-weighted average trading price of the shares
on the Toronto Stock Exchange immediately prior to the date the facility was advanced. Assets owned by Atna Resources Ltd, Atna
Resources Inc. (ARI), and Canyon Resources Corp. (CRC), excluding interests in subsidiaries of CRC other than ARI, were pledged
as security against the note. The loan origination costs of C$1.015 million were capitalized and will be amortized over the minimum
contractual life of the loan facility. The amortized loan fees are expected to be recapitalized as mine development costs.



Atna entered into an agreement in December
2011 for DMC Mining Services to perform the underground mining functions at Pinson using their own equipment. The contract is a
basic time and materials agreement. All hours are billed according to actual time sheets. Equipment is rented monthly and operating
hours for all equipment is logged and paid at each unit’s standard hourly rates.  Any materials and supplies purchased
by DMC are invoiced to Atna on a cost plus 15% fee. This current contract has no specific duration.  In the event that Atna
elects to cancel, terminate or suspend the contract, Atna is obligated to negotiate an equitable settlement with DMC. Atna and
DMC are currently discussing a change to the contract structure to an “earned-fee” structure wherein payments would
be based on key measurable results.  Atna believes this potential new structure would provide more of an incentive on the
contractor to perform.



| | D. | Exchange Controls
| | -- | -----------------



Canada has no system of exchange controls.
There are no Canadian restrictions on the repatriation of capital or earnings of a Canadian public company to non-resident investors.
There are no laws in Canada or exchange restrictions affecting the remittance of dividends, profits, interest, royalties and other
..payments to non-resident holders of the Company's securities, except as discussed in Item 10.E., “Taxation” below.



| | E. | Taxation
| | -- | --------



U.S. Federal Income Tax Consequences



The following is a summary of the anticipated
material U.S. federal income tax consequences to a U.S. Holder (as defined below) arising from and relating to the acquisition,
ownership, and disposition of Common Shares.



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This summary is for general information
purposes only and does not purport to be a complete analysis or listing of all potential U.S. federal income tax consequences that
may apply to a U.S. Holder as a result of the acquisition, ownership, and disposition of Common Shares.  In addition, this
summary does not take into account the individual facts and circumstances of any particular U.S. Holder that may affect the U.S.
federal income tax consequences of the acquisition, ownership, and disposition of Common Shares. Accordingly, this summary
is not intended to be, and should not be construed as, legal or U.S. federal income tax advice with respect to any U.S. Holder. Each
U.S. Holder should consult its own financial advisor, legal counsel, or accountant regarding the U.S. federal income, U.S. state
and local, and foreign tax consequences of the acquisition, ownership, and disposition of Common Shares.



Scope of this Summary



Authorities



This summary
is based on the Code, Treasury Regulations (whether final, temporary, or proposed), published rulings of the Internal Revenue Service
(the “IRS”), published administrative positions of the IRS, the Convention Between Canada and the United States of
America with Respect to Taxes on Income and on Capital, signed September 26, 1980, as amended (the “Canada-U.S. Tax Convention”),
and U.S. court decisions that are applicable and, in each case, as in effect and available, as of the date of this Annual Report.Any
of the authorities on which this summary is based could be changed in a material and adverse manner at any time, and any such change
could be applied on a retroactive basis. This summary does not discuss the potential effects, whether
adverse or beneficial, of any proposed legislation that, if enacted, could be applied on a retroactive basis.



U.S. Holders



For purposes of this summary, a “U.S.
Holder” is a beneficial owner of Common Shares that, for U.S. federal income tax purposes, is (a) an individual who
is a citizen or resident of the U.S., (b) a corporation, or any other entity classified as a corporation for U.S. federal
income tax purposes, that is created or organized in or under the laws of the U.S. or any state in the U.S., including the District
of Columbia, (c) an estate if the income of such estate is subject to U.S. federal income tax regardless of the source of
such income, or (d) a trust if (i) such trust has validly elected to be treated as a U.S. person for U.S. federal income
tax purposes or (ii) a U.S. court is able to exercise primary supervision over the administration of such trust and one or
more U.S. persons have the authority to control all substantial decisions of such trust.



Non-U.S. Holders



For purposes of this summary, a “non-U.S.
Holder” is a beneficial owner of Common Shares other than a U.S. Holder. This summary does not address the U.S. federal
income tax consequences of the acquisition, ownership, and disposition of Common Shares to non-U.S. Holders. Accordingly, a non-U.S.
Holder should consult its own financial advisor, legal counsel, or accountant regarding the U.S. federal income, U.S. state and
local, and foreign tax consequences (including the potential application of and operation of any income tax treaties) of the acquisition,
ownership, and disposition of Common Shares.



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U.S. Holders Subject to Special U.S.
Federal Income Tax Rules Not Addressed



This summary
does not address the U.S. federal income tax consequences of the acquisition, ownership, and disposition of Common Shares to U.S.
Holders that are subject to special provisions under the Code, including the following U.S. Holders: (a) U.S. Holders
that are tax-exempt organizations, qualified retirement plans, individual retirement accounts, or other tax-deferred accounts;
(b) U.S. Holders that are financial institutions, insurance companies, real estate investment trusts, or regulated investment
companies; (c) U.S. Holders that are dealers in securities or currencies or U.S. Holders that are traders in securities that
elect to apply a mark-to-market accounting method; (d) U.S. Holders that have a “functional currency” other than
the U.S. Dollar; (e)U.S. Holders that are liable for the alternative minimum tax under the Code; (f) U.S. Holders
that own Common Shares as part of a straddle, hedging transaction, conversion transaction, constructive sale, or other arrangement
involving more than one position; (g) U.S. Holders that acquired Common Shares in connection with the exercise of employee
stock options or otherwise as compensation for services; (h) U.S. Holders that hold Common Shares other than as a capital
asset within the meaning of Section 1221 of the Code; or (i) U.S. Holders that own (directly, indirectly, or constructively)
10 percent or more, by voting power or value, of the outstanding shares of the Company. U.S. Holders
that are subject to special provisions under the Code, including U.S. Holders described immediately above, should consult their
own financial advisor, legal counsel or accountant regarding the U.S. federal income, U.S. state and local, and foreign tax consequences
of the acquisition, ownership, and disposition of Common Shares.



If an entity that is classified as a partnership
(or “pass-through” entity) for U.S. federal income tax purposes holds Common Shares, the U.S. federal income tax consequences
to such partnership (or “pass-through” entity) and the partners of such partnership (or owners of such “pass-through”
entity) generally will depend on the activities of the partnership (or “pass-through” entity) and the status of such
partners (or owners). Partners of entities that are classified as partnerships (or owners of “pass-through” entities)
for U.S. federal income tax purposes should consult their own financial advisor, legal counsel or accountant regarding the U.S.
federal income tax consequences of the acquisition, ownership, and disposition of Common Shares.



Tax Consequences Other than U.S. Federal
Income Tax Consequences Not Addressed



This summary does not address the U.S.
state and local, U.S. federal estate and gift, or foreign tax consequences to U.S. Holders of the acquisition, ownership, and disposition
of Common Shares. Each U.S. Holder should consult its own financial advisor, legal counsel, or accountant regarding the U.S. state
and local, U.S. federal estate and gift, and foreign tax consequences of the acquisition, ownership, and disposition of Common
Shares.



U.S. Federal Income Tax Consequences
of the Acquisition, Ownership, and Disposition of Common Shares



Distributions on Common Shares



General Taxation of Distributions



A U.S. Holder that receives a distribution,
including a constructive distribution, with respect to the Common Shares will be required to include the amount of such distribution
in gross income as a dividend (without reduction for any Canadian income tax withheld from such distribution) to the extent of
the current or accumulated “earnings and profits” of the Company. To the extent that a distribution exceeds the
current and accumulated “earnings and profits” of the Company, such distribution will be treated (a) first, as
a tax-free return of capital to the extent of a U.S. Holder’s tax basis in the Common Shares and, (b) thereafter, as
gain from the sale or exchange of such Common Shares. (See more detailed discussion at “Disposition of Common Shares”
below).



Reduced Tax Rates for Certain Dividends



For taxable years beginning after December
31, 2002 and before January 1, 2013, a dividend paid by the Company generally will be taxed at the preferential tax rates applicable
to long-term capital gains if (a) the Company is a “qualified foreign corporation” (as defined below), (b) the
U.S. Holder receiving such dividend is an individual, estate, or trust, and (c) such dividend is paid on Common Shares that
have been held by such U.S. Holder for at least 61 days during the 121-day period beginning 60 days before the “ex-dividend
date.”



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The Company generally will be a “qualified
foreign corporation” under Section 1(h)(11) of the Code (a “QFC”) if: (a) the Company is incorporated
in a possession of the U.S., (b) the Company is eligible for the benefits of the Canada-U.S. Tax Convention, or (c) the
Common Shares are readily tradable on an established securities market in the U.S. However, even if the Company satisfies
one or more of such requirements, the Company will not be treated as a QFC if the Company is a “passive foreign investment
company” (as defined below) for the taxable year during which the Company pays a dividend or for the preceding taxable year.



As discussed below, the Company reasonably
believes that it was not a “passive foreign investment company” for the taxable years ended December 31, 2008 through
December 31, 2011. (See more detailed discussion at “Additional Rules that May Apply to U.S. Holders—Passive Foreign
Investment Company” below).



If the Company is not a QFC, a dividend
paid by the Company to a U.S. Holder, including a U.S. Holder that is an individual, estate, or trust, generally will be taxed
at ordinary income tax rates (and not at the preferential tax rates applicable to long-term capital gains). The dividend rules
are complex, and each U.S. Holder should consult its own financial advisor, legal counsel, or accountant regarding the dividend
rules.



Distributions Paid in Foreign Currency



The amount of a distribution paid to a
U.S. Holder in foreign currency generally will be equal to the U.S. Dollar value of such distribution based on the exchange rate
applicable on the date of receipt.



Dividends Received Deduction



Dividends paid on the Common Shares generally
will not be eligible for the “dividends received deduction.” The availability of the dividends received deduction
is subject to complex limitations that are beyond the scope of this discussion, and a U.S. Holder that is a corporation should
consult its own financial advisor, legal counsel, or accountant regarding the dividends received deduction.



Disposition of Common Shares



A U.S. Holder will recognize gain or loss
on the sale or other taxable disposition of Common Shares in an amount equal to the difference, if any, between (a) the amount
of cash plus the fair market value of any property received and (b) such U.S. Holder’s tax basis in the Common Shares
sold or otherwise disposed of. Any such gain or loss generally will be capital gain or loss, which will be long-term capital
gain or loss if the Common Shares are held for more than one year. Gain or loss recognized by a U.S. Holder on the sale or
other taxable disposition of Common Shares generally will be treated as “U.S. source” for purposes of applying the
U.S. foreign tax credit rules.  (See more detailed discussion at “Foreign Tax Credit” below).



Preferential tax rates apply to long-term
capital gains of a U.S. Holder that is an individual, estate, or trust. There are currently no preferential tax rates for
long-term capital gains of a U.S. Holder that is a corporation. Deductions for capital losses are subject to significant limitations
under the Code.



Foreign Tax Credit



A U.S. Holder that pays (whether directly
or through withholding) Canadian income tax with respect to dividends paid on the Common Shares generally will be entitled, at
the election of such U.S. Holder, to receive either a deduction or a credit for such Canadian income tax paid. Generally,
a credit will reduce a U.S. Holder’s U.S. federal income tax liability on a Dollar-for-Dollar basis, whereas a deduction
will reduce a U.S. Holder’s income subject to U.S. federal income tax. This election is made on a year-by-year basis
and applies to all foreign taxes paid (whether directly or through withholding) by a U.S. Holder during a year.



85







Complex limitations apply to the foreign
tax credit, including the general limitation that the credit cannot exceed the proportionate share of a U.S. Holder’s U.S.
federal income tax liability that such U.S. Holder’s “foreign source” taxable income bears to such U.S. Holder’s
worldwide taxable income. In applying this limitation, a U.S. Holder’s various items of income and deduction must be
classified, under complex rules, as either “foreign source” or “U.S. source.” In addition, this limitation
is calculated separately with respect to specific categories of income. Dividends paid by the Company generally will constitute
“foreign source” income and generally will be categorized as “passive income.” The foreign tax credit rules
are complex, and each U.S. Holder should consult its own financial advisor, legal counsel, or accountant regarding the foreign
tax credit rules.



Information Reporting; Backup Withholding
Tax



Payments made within the U.S., or by a
U.S. payer or U.S. middleman, of dividends on, or proceeds arising from the sale or other taxable disposition of, Common Shares
generally will be subject to information reporting and backup withholding tax, at the rate of 28 percent, if a U.S. Holder (a) fails
to furnish such U.S. Holder’s correct U.S. taxpayer identification number (generally on Form W-9), (b) furnishes an
incorrect U.S. taxpayer identification number, (c) is notified by the IRS that such U.S. Holder has previously failed to properly
report items subject to backup withholding tax, or (d) fails to certify, under penalty of perjury, that such U.S. Holder has
furnished its correct U.S. taxpayer identification number and that the IRS has not notified such U.S. Holder that it is subject
to backup withholding tax. However, U.S. Holders that are corporations generally are excluded from these information reporting
and backup withholding tax rules. Any amounts withheld under the U.S. backup withholding tax rules will be allowed as a credit
against a U.S. Holder’s U.S. federal income tax liability, if any, or will be refunded, if such U.S. Holder furnishes required
information to the IRS. Each U.S. Holder should consult its own financial advisor, legal counsel, or accountant regarding
the information reporting and backup withholding tax rules.



Additional Rules that May Apply to
U.S. Holders



If the Company isa “controlled foreign corporation” or a “passive foreign investment company” (each as defined below),
the preceding sections of this summary may not describe the U.S. federal income tax consequences to U.S. Holders of the acquisition,
ownership, and disposition of Common Shares.



Controlled Foreign Corporation



The Company generally will be a “controlled
foreign corporation” under Section 957 of the Code (a “CFC”) if more than 50 percent of the total voting
power or the total value of the outstanding shares of the Company is owned, directly or indirectly, by citizens or residents of
the U.S., domestic partnerships, domestic corporations, domestic estates, or domestic trusts (each as defined in Section 7701(a)(30)
of the Code), each of which own, directly or indirectly, 10 percent or more of the total voting power of the outstanding shares
of the Company (a “10 percent Shareholder”).



If the Company is a CFC, a 10 percent Shareholder
generally will be subject to current U.S. federal income tax with respect to (a) such 10 percent Shareholder’s pro rata
share of the “subpart F income” (as defined in Section 952 of the Code) of the Company and (b) such 10 percent
Shareholder’s pro rata share of the earnings of the Company invested in “United States property” (as defined
in Section 956 of the Code).  In addition, under Section 1248 of the Code, any gain recognized on the sale or other
taxable disposition of Common Shares by a U.S. Holder that was a 10 percent Shareholder at any time during the five-year period
ending with such sale or other taxable disposition generally will be treated as a dividend to the extent of the “earnings
and profits” of the Company that are attributable to such Common Shares. If the Company is both a CFC and a “passive
foreign investment company” (as defined below), the Company generally will be treated as a CFC (and not as a “passive
foreign investment company”) with respect to any 10 percent Shareholder.



86







The Company does not believe that it has
previously been, or currently is, a CFC. However, there can be no assurance that the Company will not be a CFC for the current
or any subsequent taxable year.



Passive Foreign Investment Company



The Company would be a “passive foreign
investment company” under Section 1297 of the Code (a “PFIC”) if, for a taxable year, (a) 75 percent
or more of the gross income of the Company for such taxable year is passive income or (b) 50 percent or more of the assets
held by the Company either produce passive income or are held for the production of passive income, based on the fair market value
of such assets (or on the adjusted tax basis of such assets, if the Company is not publicly traded and either is a “controlled
foreign corporation” or makes an election).  “Passive income” includes, for example, dividends, interest,
certain rents and royalties, certain gains from the sale of stock and securities, and certain gains from commodities transactions.



For purposes of the PFIC income test and
asset test described above, if the Company owns, directly or indirectly, 25 percent or more of the total value of the outstanding
shares of another corporation, the Company will be treated as if it (a) held a proportionate share of the assets of such other
foreign corporation and (b) received directly a proportionate share of the income of such other foreign corporation. In addition,
for purposes of the PFIC income test and asset test described above, “passive income” does not include any interest,
dividends, rents, or royalties that are received or accrued by the Company from a “related person” (as defined in Section 954(d)(3)
of the Code), to the extent such items are properly allocable to the income of such related person that is not passive income.



Based on currently available information,
the Companyreasonably believes that it was not a “passive foreign investment company”
for the taxable years ended December 31, 2008 through December 31, 2012.



The determination of whether the Company
was, or will be, a PFIC for a taxable year depends, in part, on the application of complex U.S. federal income tax rules, which
are subject to differing interpretations.  In addition, whether the Company will be a PFIC for each subsequent taxable year
depends on the assets and income of the Company over the course of each such taxable year and, as a result, cannot be predicted
with certainty as of the date of this Annual Report. Accordingly, there can be no assurance that the IRS will not challenge
the determination made by the Company concerning its PFIC status.



Default PFIC Rules Under Section 1291
of the Code



If the Company is a PFIC, the U.S. federal
income tax consequences to a U.S. Holder of the acquisition, ownership, and disposition of Common Shares will depend on whether
such U.S. Holder makes an election to treat the Company as a “qualified electing fund” or “QEF” under Section 1295
of the Code (a “QEF Election”) or a mark-to-market election under Section 1296 of the Code (a “Mark-to-Market
Election”). A U.S. Holder that does not make either a QEF Election or a Mark-to-Market Election will be referred to
in this summary as a “Non-Electing U.S. Holder.”



A Non-Electing U.S. Holder will be subject
to the rules of Section 1291 of the Code with respect to (a) any gain recognized on the sale or other taxable disposition
of Common Shares and (b) any excess distribution paid on the Common Shares. A distribution generally will be an “excess
distribution” to the extent that such distribution (together with all other distributions received in the current taxable
year) exceeds 125 percent of the average distributions received during the three preceding taxable years (or during a U.S. Holder’s
holding period for the Common Shares, if shorter).



87







Under Section 1291 of the Code, any
gain recognized on the sale or other taxable disposition of Common Shares, and any excess distribution paid on the Common Shares,
must be ratably allocated to each day in a Non-Electing U.S. Holder’s holding period for the Common Shares. The amount
of any such gain or excess distribution allocated to prior years of such Non-Electing U.S. Holder’s holding period for the
Common Shares (other than years prior to the first taxable year of the Company beginning after December 31, 1986 for which the
Company was not a PFIC) will be subject to U.S. federal income tax at the highest tax applicable to ordinary income in each such
prior year. A Non-Electing U.S. Holder will be required to pay interest on the resulting tax liability for each such prior
year, calculated as if such tax liability had been due in each such prior year. Such a Non-Electing U.S. Holder that is not
a corporation must treat any such interest paid as “personal interest,” which is not deductible. The amount of
any such gain or excess distribution allocated to the current year of such Non-Electing U.S. Holder’s holding period for
the Common Shares will be treated as ordinary income in the current year, and no interest charge will be incurred with respect
to the resulting tax liability for the current year.



If the Company is a PFIC for any taxable
year during which a Non-Electing U.S. Holder holds Common Shares, the Company will continue to be treated as a PFIC with respect
to such Non-Electing U.S. Holder, regardless of whether the Company ceases to be a PFIC in one or more subsequent years. A
Non-Electing U.S. Holder may terminate this deemed PFIC status by electing to recognize gain (which will be taxed under the rules
of Section 1291 of the Code discussed above) as if such Common Shares were sold on the last day of the last taxable year for
which the Company was a PFIC.



QEF Election



A U.S. Holder that makes a QEF Election
generally will not be subject to the rules of Section 1291 of the Code discussed above. However, a U.S. Holder that makes
a QEF Election will be subject to U.S. federal income tax on such U.S. Holder’s pro rata share of (a) the net capital
gain of the Company, which will be taxed as long-term capital gain to such U.S. Holder, and (b) and the ordinary earnings
of the Company, which will be taxed as ordinary income to such U.S. Holder. Generally, “net capital gain” is the
excess of (a) net long-term capital gain over (b) net short-term capital loss, and “ordinary earnings” are
the excess of (a) “earnings and profits” over (b) net capital gain.  A U.S. Holder that makes a QEF
Election will be subject to U.S. federal income tax on such amounts for each taxable year in which the Company is a PFIC, regardless
of whether such amounts are actually distributed to such U.S. Holder by the Company. However, a U.S. Holder that makes a QEF
Election may, subject to certain limitations, elect to defer payment of current U.S. federal income tax on such amounts, subject
to an interest charge.  If such U.S. Holder is not a corporation, any such interest paid will be treated as “personal
interest,” which is not deductible.



A U.S. Holder that makes a QEF Election
generally (a) may receive a tax-free distribution from the Company to the extent that such distribution represents “earnings
and profits” of the Company that were previously included in income by the U.S. Holder because of such QEF Election and (b) will
adjust such U.S. Holder’s tax basis in the Common Shares to reflect the amount included in income or allowed as a tax-free
distribution because of such QEF Election. In addition, a U.S. Holder that makes a QEF Election generally will recognize capital
gain or loss on the sale or other taxable disposition of Common Shares.



88







The procedure for making a QEF Election,
and the U.S. federal income tax consequences of making a QEF Election, will depend on whether such QEF Election is timely. A
QEF Election will be treated as “timely” if such QEF Election is made for the first year in the U.S. Holder’s
holding period for the Common Shares in which the Company was a PFIC. A U.S. Holder may make a timely QEF Election by filing
the appropriate QEF Election documents at the time such U.S. Holder files a U.S. federal income tax return for such first year. 
However, if the Company was a PFIC in a prior year, then in addition to filing the QEF Election documents, a U.S. Holder must elect
to recognize (a) gain (which will be taxed under the rules of Section 1291 of the Code discussed above) as if the Common
Shares were sold on the qualification date or (b) if the Company was also a CFC, such U.S. Holder’s pro rata share of
the post-1986 “earnings and profits” of the Company as of the qualification date. The “qualification date”
is the first day of the first taxable year in which the Company was a QEF with respect to such U.S. Holder. The election to
recognize such gain or “earnings and profits” can only be made if such U.S. Holder’s holding period for the Common
Shares includes the qualification date. By electing to recognize such gain or “earnings and profits,” such U.S.
Holder will be deemed to have made a timely QEF Election. In addition, under very limited circumstances, a U.S. Holder may
make a retroactive QEF Election if such U.S. Holder failed to file the QEF Election documents in a timely manner.



A QEF Election will apply to the taxable
year for which such QEF Election is made and to all subsequent taxable years, unless such QEF Election is invalidated or terminated
or the IRS consents to revocation of such QEF Election. If a U.S. Holder makes a QEF Election and, in a subsequent taxable
year, the Company ceases to be a PFIC, the QEF Election will remain in effect (although it will not be applicable) during those
taxable years in which the Company is not a PFIC. Accordingly, if the Company becomes a PFIC in another subsequent taxable
year, the QEF Election will be effective and the U.S. Holder will be subject to the QEF rules described above during any such subsequent
taxable year in which the Company qualifies as a PFIC. In addition, the QEF Election will remain in effect (although it will
not be applicable) with respect to a U.S. Holder even after such U.S. Holder disposes of all of such U.S. Holder’s direct
and indirect interest in the Common Shares. Accordingly, if such U.S. Holder reacquires an interest in the Company, such U.S.
Holder will be subject to the QEF rules described above for each taxable year in which the Company is a PFIC.



Each U.S. Holder should consult its own
financial advisor, legal counsel, or accountant regarding the availability of, and procedure for making, a QEF Election. U.S.
Holders should be aware that there can be no assurance that the Company will satisfy record keeping requirements that apply to
a QEF, or that the Company will supply U.S. Holders with information that such U.S. Holders require to report under the QEF rules,
in event that the Company is a PFIC and a U.S. Holder wishes to make a QEF Election.



Mark-to-Market Election



A U.S. Holder may make a Mark-to-Market
Election only if the Common Shares are marketable stock. The Common Shares generally will be “marketable stock”
if the Common Shares are regularly traded on a qualified exchange or other market. For this purpose, a “qualified exchange
or other market” includes (a) a national securities exchange that is registered with the SEC, (b) the national
market system established pursuant to section 11A of the Securities and Exchange Act of 1934, or (c) a foreign securities
exchange that is regulated or supervised by a governmental authority of the country in which the market is located, provided that
(i) such foreign exchange has trading volume, listing, financial disclosure, surveillance, and other requirements designed
to prevent fraudulent and manipulative acts and practices, remove impediments to and perfect the mechanism of a free, open, fair,
and orderly market, and protect investors (and the laws of the country in which the foreign exchange is located and the rules of
the foreign exchange ensure that such requirements are actually enforced) (ii) the rules of such foreign exchange effectively
promote active trading of listed stocks.  If the Common Shares are traded on such a qualified exchange or other market, the
Common Shares generally will be “regularly traded” for any calendar year during which the Common Shares are traded,
other than in de minimis quantities, on at least 15 days during each calendar quarter. The Company believes that its Common Shares
should qualify as marketable stock.



A U.S. Holder that makes a Mark-to-Market
Election generally will not be subject to the rules of Section 1291 of the Code discussed above. However, if a U.S. Holder
makes a Mark-to-Market Election after the beginning of such U.S. Holder’s holding period for the Common Shares and such U.S.
Holder has not made a timely QEF Election, the rules of Section 1291 of the Code discussed above will apply to certain dispositions
of, and distributions on, the Common Shares.



89







A U.S. Holder that makes a Mark-to-Market
Election will include in ordinary income, for each taxable year in which the Company is a PFIC, an amount equal to the excess,
if any, of (a) the fair market value of the Common Shares as of the close of such taxable year over (b) such U.S. Holder’s
tax basis in such Common Shares. A U.S. Holder that makes a Mark-to-Market Election will be allowed a deduction in an amount
equal to the lesser of (a) the excess, if any, of (i) such U.S. Holder’s adjusted tax basis in the Common Shares
over (ii) the fair market value of such Common Shares as of the close of such taxable year or (b) the excess, if any,
of (i) the amount included in ordinary income because of such Mark-to-Market Election for prior taxable years over (ii) the
amount allowed as a deduction because of such Mark-to-Market Election for prior taxable years.



A U.S. Holder that makes a Mark-to-Market
Election generally also will adjust such U.S. Holder’s tax basis in the Common Shares to reflect the amount included in gross
income or allowed as a deduction because of such Mark-to-Market Election. In addition, upon a sale or other taxable disposition
of Common Shares, a U.S. Holder that makes a Mark-to-Market Election will recognize ordinary income or loss (such ordinary loss
not to exceed the excess, if any, of (a) the amount included in ordinary income because of such Mark-to-Market Election for
prior taxable years over (b) the amount allowed as a deduction because of such Mark-to-Market Election for prior taxable years).



A Mark-to-Market Election applies to the
taxable year in which such Mark-to-Market Election is made and to each subsequent taxable year, unless the Common Shares cease
to be “marketable stock” or the IRS consents to revocation of such election. Each U.S. Holder should consult its
own financial advisor, legal counsel, or accountant regarding the availability of, and procedure for making, a Mark-to-Market Election.



Other PFIC Rules



Under Section 1291(f) of the Code,
the IRS has issued proposed Treasury Regulations that, subject to certain exceptions, would cause a U.S. Holder that had not made
a timely QEF Election to recognize gain (but not loss) upon certain transfers of Common Shares that would otherwise be tax-deferred
(e.g., gifts and exchanges pursuant to corporate reorganizations). However, the specific U.S. federal income tax consequences
to a U.S. Holder may vary based on the manner in which Common Shares are transferred.



Certain additional adverse rules will apply
with respect to a U.S. Holder if the Company is a PFIC, regardless of whether such U.S. Holder makes a QEF Election.  For
example under Section 1298(b)(6) of the Code, a U.S. Holder that uses Common Shares as security for a loan will, except as
may be provided in Treasury Regulations, be treated as having made a taxable disposition of such Common Shares.



The PFIC rules are complex, and each U.S.
Holder should consult its own financial advisor, legal counsel, or accountant regarding the PFIC rules and how the PFIC rules may
affect the U.S. federal income tax consequences of the acquisition, ownership, and disposition of Common Shares.



Additional Tax on Passive Income



For tax years beginning after December
31, 2012, certain individuals, estates and trusts whose income exceeds certain thresholds will be required to a pay 3.8 percent
Medicare surtax on “net investment income” including, among other things, dividends and get gain from disposition of
property (other than property held in a trade or business). U.S. Holders should consult with their own tax advisors regarding the
effect, if any, of this tax on their ownership and disposition of common shares.



| | F. | Dividends and Paying Agents
| | -- | ---------------------------



This Form 20-F is being filed as an Annual
Report under the Exchange Act and, as such, there is no requirement to provide any information under this section.



90







| | G. | Statement by Experts
| | -- | --------------------



This Form 20-F is being filed as an Annual
Report under the Exchange Act and, as such, there is no requirement to provide any information under this section.



| | H. | Documents on Display
| | -- | --------------------



Documents referred to in this Annual Report
may be inspected at the head office of the Company at Suite 250 – 14142 Denver West Parkway, Golden, Colorado 80401 or the
Company's Canadian legal counsel located at 3000 - 1055 West Georgia Street, Vancouver, British Columbia, V6E 3R3 during normal
business hours.



The Company is subject to the information
requirements of the Exchange Act and, to the extent required of Canadian companies, will file periodic reports and other information
with the SEC. All such reports and information may be ready and copied at the public reference facilities listed below. The Company
intends to give its shareholders annual reports containing audited consolidated financial statements and a report thereon from
its independent chartered accountants and quarterly reports for the first three quarters of each year containing unaudited interim
financial information.



The Company’s SEC filings, and the
exhibits thereto, are available for inspection and copying at the public reference facilities maintained by the SEC in Judiciary
Plaza, 100 F Street, NE, Room 1580, Washington, DC 20549. Copies of these filings may be obtained from these offices after the
payment of prescribed fees. Please call the SEC at (202) 551-8090 for further information on the public reference rooms. These
filings are also available at no charge at the SEC’s website at http//www.sec.gov/edgar.shtml.



The Company will also provide its shareholders
with proxy statements prepared according to Canadian law. As a Canadian company, the Company is exempt from the Exchange Act rules
about prescribing the furnishing and content of proxy statements to shareholders and is also exempt from the short-swing profit
recovery and disclosure regime of section 16 of the Exchange Act.



| | ITEM 11. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET
RISK
| | -------- | ----------------------------------------------------------



Quantitative Information about Market
Risk



Derivatives



As of
December 31, 2012 the Company had the following derivatives outstanding:



|Derivative Contracts                             |  | Strike Price |       |  | Ounces in 2013 |  |       | Fair Value | 
|------------------------------------------------ |  | ------------ | ----- |  | -------------- |  | ----- | ---------- | 
|Gold bond forwards Embedded derivative (Note 12) |  | $            | 1,113 |  |                |  | 3,257 |            | 



The fair market value in the table above
was estimated based on the gold price per ounce from the London PM Fix on December 31, 2012 of $1,664 and discounting using an
unsecured market interest rate of 12 percent. The change in the fair value of the hedge position will be positive to the Company
when gold prices fall and will be negative when gold prices rise relative to the gold price on the date of the previous fair value
calculation.



91







The Company’s open hedge positions
as of December 31, 2012 consist solely of the Gold Bonds. The Gold Bonds must be repaid by delivering 814 ounces per quarter through
and including December 31, 2013. The Company believes that these outstanding contracts will be settled in the normal course of
business. The Company’s policy is to not hedge more than 50 percent of the projected production and retain a 25 percent production
reserve tail. At December 31, 2012, the outstanding hedge position covers less than 9 percent of the annual forward looking gold
production from Briggs.



Under the terms of the gold bond forwards
(embedded derivative contracts) in the gold bond agreements, Atna will deliver the value of 814 ounces of gold each quarter on
the contractual delivery date, which will be used to purchase shares of a gold exchange traded fund for each bond holders account
and 6.25 percent of the original face value of the Gold Bonds will be redeemed. The fair value of the gold bond forwards is determined
using observable market inputs of similar contracts.



During 2010 the Company retired 6,000 ounces
of gold put and call options that had expiry dates from January to December 2010 at the rate of 500 ounces per month. The collars
consisted of an equal number of put and call option contracts with similar expiry dates. The put and call option contracts were
European style options that could be physically delivered or settled net at the expiry date. During 2010 5,000 ounces of call options
with a strike price of $1,100 per ounce were exercised by the counterparty. The Company used the Black-Scholes option valuation
method to determine the market values of the option style derivatives. Other than the embedded forward sales contracts within the
Gold Bonds, no derivatives were utilized in 2012 and 2011.



Qualitative Information about Market
Risks



The Company is exposed to a number of financial
risks including market risks, credit risks and liquidity risks. Market risks include commodity price risk, security price risk,
foreign exchange risk, and fair value interest rate risk. Credit risks and liquidity risks may be significantly impacted by market
conditions and risks as well. The Company has risk management policies and programs that involve senior management and when appropriate,
the Board. The main purpose of these policies and programs is to manage cash flow and raise financing as required and in a timely
fashion for the Company’s development programs. The Company may use various financial instruments to manage related risks.
It is the Company’s policy that no trading in derivatives for speculative purposes is permitted.



Gold price risk: The Company’s
primary product is gold. The value of the Company’s assets, its earnings and its operating cash flows are significantly impacted
by the market price of gold. The market price of gold and the value of mineral interests related thereto have fluctuated widely
and are affected by numerous factors beyond the control of the Company. These factors include international economic and political
conditions, expectations of inflation, international currency exchange rates, interest rates, global or regional consumptive patterns,
speculative activities, changes in production due to mine development and improved mining and production methods, metal stock levels,
governmental regulations, and central bank policies. The exact effect of these factors cannot be accurately predicted, but the
combination of these factors may result in the Company not receiving a profit or acceptable rate of return on invested capital
or the investment not retaining its value.



For 2012, if the price of gold averaged
10 percent higher or lower per ounce, the Company would have recorded an increase or decrease in revenue of approximately $6.0
million, respectively. For 2011, if the price of gold averaged 10 percent higher or lower per ounce, the Company would have recorded
an increase or decrease in revenue of approximately $5.2 million, respectively.



The Company may enter into gold derivative
contracts (hedges) to mitigate the impacts of lower gold prices on its operations. Management and the Board have set a gold hedge
limit of 50 percent of annual production plus a reserve tail of 25 percent of the life-of-mine production. The gold derivative
contracts may include the purchase of put options and the sale of call options, which in some cases are structured as a collar,
and forward gold sales, including embedded derivatives. Derivative financial instruments are recorded at fair value, and hedge
accounting has not been employed.



92







The only derivative contracts existing
as of December 31, 2012 and December 31, 2011 were embedded forward gold sales in the 2009 Gold Bonds. If the price of gold increases
or decreases by 10 percent, the Company’s gold bond derivative liabilities existing as of December 31, 2012, would increase
or decrease by $0.5 million, respectively. An increase in gold price increases the liability and an unrealized loss would be recognized;
whereas a decrease in gold price decreases the liability and an unrealized gain would be recognized.



Liquidity risk: Liquidity
risk represents the risk that the Company cannot fund its current operations and obligations. This risk arises in turn primarily
from operating and business risks that have the potential to disrupt cash flows, inclusive of risks of material changes in gold
prices, production schedules and outputs, operating costs, spending on or timing of development, and changes in regulations. Cash
flow forecasting is performed regularly in aggregate for the Company with the objective of managing operating, investing, and financing
cash flows to maintain a continuity of funding.



Economic factors beyond the Company’s
control may also make additional funding temporarily unavailable. The Company is seeking revolving lines of credit and undrawn
committed borrowing facilities in order to better manage liquidity risks, but such facilities do not yet exist. Should cash flows
from operations and existing cash be insufficient to meet current obligations, refinancing of debt obligations, the sale of assets,
or an equity issuance would be necessary, and there is no assurance that such financing activities would be successful.



Equipment financing is restricted to $10
million at Briggs by a covenant in the 2009 Gold Bond agreement and to $20 million for the Company as a whole by a covenant in
the Sprott credit agreement. The 2009 Gold Bond agreement includes a negative covenant preventing additional encumbrances at Briggs
through its termination in December 2013. The Sprott credit agreement, as amended in March 2013: precludes additional borrowing
for the construction of the Reward mine until the balance due Sprott has been reduced below C$11.5 million; precludes material
sales of assets and material issuances of secured debt during its term; and includes a negative covenant preventing additional
encumbrances at Briggs through the term of the facility. The Sprott credit agreement may be terminated early, however under the
March 2013 amendment, an early prepayment fee of 2 percent would be due Sprott.



The table below summarizes the maturity
profile of the Company’s financial liabilities based on contractual undiscounted payments as of the dates indicated. In both
2012 and in 2011, extensions, subsequent to year-ends, of obligations due Sprott have been reclassified to the later appropriate
columns.



|                                 |  |       |            |  | Payments due by Period as of December 31, 2012 |  
|-------------------------------- |  | ----- | ---------- |  | ---------------------------------------------- | -
|                                 |  |       |            |  | Less than                                      |  
|                                 |  | Total |            |  | 3  months                                      |  
|Trade and other payables         |  | $     | 7,163,500  |  |                                                | $
|Finance lease obligations        |  |       | 3,330,900  |  |                                                |  
|Derivative financial instruments |  |       | 1,733,500  |  |                                                |  
|Long term debt obligations       |  |       | 26,601,400 |  |                                                |  
|                                 |  |       |            |  |                                                |  
|Total                            |  | $     | 38,829,300 |  |                                                | $



93







|                                 |  |       |            |  | Payments due by Period as of December 31, 2011 |  
|-------------------------------- |  | ----- | ---------- |  | ---------------------------------------------- | -
|                                 |  |       |            |  | Less than                                      |  
|                                 |  | Total |            |  | 3  months                                      |  
|Trade and other payables         |  | $     | 4,783,400  |  |                                                | $
|Finance lease obligations        |  |       | 2,477,300  |  |                                                |  
|Derivative financial instruments |  |       | 2,845,100  |  |                                                |  
|Long term debt obligations       |  |       | 29,345,200 |  |                                                |  
|                                 |  |       |            |  |                                                |  
|Total                            |  | $     | 39,451,000 |  |                                                | $



Capital management: The primary
objective of the Company’s capital management is to maintain healthy capital ratios in order to support its operations and
development, limit the risks of default on debt obligations, and maximize shareholder value. The Company manages its capital structure
and makes adjustments to it in light of business and economic conditions. To date, the Company has not declared or paid any dividends.
The Company has issued new shares and may again with the intent to maintain or adjust its capital structure. The Company has the
practice of developing its mines at a controlled and measured pace in order to manage financial leverage. Management principally
considers the debt to total asset ratio as a measure of financial leverage and overall capital structure; such ratio being 27 percent
at December 31, 2012 and 34 percent at December 31, 2011. Long-term cash flow forecasts are prepared at least annually for the
Company with the objective of managing debt levels, rates of development, and the long-term capital structure.



Foreign exchange risk: The
Sprott debt facility of C$20 million is denominated in Canadian dollars. Changes in the CAD/USD exchange rate will proportionately
affect the reported value of this liability. Otherwise, the Company’s assets, liabilities, revenues and costs are primarily
denominated in USD, and not significantly impacted by foreign exchange risks. If the CAD to USD exchange rate increases or decreases
by 10 percent, the reported value of the C$20 million debt obligation will increase or decrease by $1.8 million or $2.2 million,
respectively.



One of the market conditions that may affect
the price of gold is the extent to which gold is viewed as a safe-haven or hedge against fluctuations in major currencies such
as the US dollar and the Euro. Foreign exchange may therefore have a significant indirect impact upon the Company.



Credit and customer risks:
Credit risk represents the loss that would be recognized if counterparties failed to perform as contracted. Credit risks arise
from market, industry, and individual counterparty conditions. Concentrations of credit risk, on or off balance sheet, exist for
counterparties when they have similar economic characteristics that would cause their ability to meet contractual obligations to
be similarly affected by changes in economic or other conditions. The Company manages counterparty credit risk by monitoring the
creditworthiness of counterparties.



The Company
is subject to concentrations of credit risk in connection with maintaining its cash balances primarily in U.S. and Canadian financial
institutions in amounts in excess of levels insured by the Federal Deposit Insurance Corporation and the Canada Deposit Insurance
Corporation. Restricted cash held as collateral against surety bonds is invested by the surety-trustee in certificates of deposit
and US Treasury instruments.



Sales of gold by Briggs expose the Company
to the credit risk of nonpayment by the buyer. Briggs sells all of its gold to one or two customers with payment terms of 0 to
14 days. At any one time, the level of receivable is usually less than two percent of the Company’s total annual revenues.
Due to the global and liquid markets for gold, geographic and customer concentrations are considered to pose immaterial risks.



94







To the
extent Pinson sells ore and doré, distinguished from gold sales by Briggs, and generates trade receivables, credit risk
will arise. In October 2012, Pinson entered into an agreement to sell oxide ore under specified terms through December 31, 2013
to a third-party processor, Newmont Mining Corporation. Pinson is presently dependent on this one customer to buy oxide ore. Pinson
has a life-of-mine contract to place, at its option, sulfide ore with a separate third-party processor, Barrick Gold Corporation,
who will also buy under agreed-upon terms the resultant doré. Pinson is presently dependent on this one customer to process
and buy sulfide ore.



The embedded derivative in the 2009 Gold
Bond was the only derivative contract outstanding as of December 31, 2012 and December 31, 2011. Since the 2009 Gold Bonds do not
require further cash payments to the Company, they do not generate third party credit risk to the Company.



Equity securities price risk:
The Company is exposed to equity securities price risk because of investments held as available-for-sale. These securities have
typically been received in payment from joint venture or other business partners for obligations due. The fair value balances of
available-for-sale securities at December 31, 2012 and December 31, 2011 were $83,900 and $323,900, respectively, representing
the maximum potential losses from changes in prices of equity investments.



Fair value interest rate risk:
The Company has only entered into debt agreements with fixed interest rates. Fixed interest rates expose the Company to fair value
interest rate risks. There is the qualitative risk that a fixed rate liability will become uncompetitive in the future as market
rates decline or the Company’s credit position improves. The Company’s other qualitative interest rate risk arises
from the mismatch of fixed rate liabilities and floating rate assets. Management of the fair value interest rate risk involves
taking into consideration the duration of debt agreements, refinancing penalties, options to renew existing positions, the availability
of floating–rate debt and other alternative financing.



Regulatory risk: Changes
in the regulatory environment in the U.S. may affect the recoverability of mineral reserves, the costs of operating, the costs
of reclamation, and other factors having a material impact upon the business. The Company works diligently and in good faith to
meet or exceed all applicable permitting requirements, reclamation obligations, and other regulations, but is subject to the authoritative
changes.



Another form of regulatory risk is the
potential change in income, severance, or other tax rates and laws that could reduce future profitability or impair our reported
deferred tax asset. The Company has only taken more-likely-than-not positions in determining its deferred tax asset.



| | ITEM 12. | DESCRIPTION OF SECURITIES OTHER THAN EQUITY SECURITIES
| | -------- | ------------------------------------------------------



| | A. | Debt Securities
| | -- | ---------------



This Form 20-F is being filed as an Annual
Report under the Exchange Act and, as such, there is no requirement to provide any information under this section.



| | B. | Warrants and Rights
| | -- | -------------------



This Form 20-F is being filed as an Annual
Report under the Exchange Act and, as such, there is no requirement to provide any information under this section.



| | C. | Other Securities
| | -- | ----------------



Not applicable.



95







PART II



| | ITEM 13. | DEFAULTS, DIVIDEND ARREARAGES AND DELINQUENCIES
| | -------- | -----------------------------------------------



Not applicable.



| | ITEM 14. | MATERIAL MODIFICATIONS TO THE RIGHTS OF SECURITY HOLDERS
AND USE OF PROCEEDS
| | -------- | ----------------------------------------------------------------------------



At the Annual General & Special Meeting
of the Company held on June 5, 2012, the shareholders approved a shareholders rights plan. Previously, the Company had a Shareholder
Rights Plan (the “Rights Plan”), which was confirmed by the shareholders at the Annual and Extraordinary General Meeting
held on June 8, 2001 and at the Annual and Extraordinary General Meeting held on April 14, 2005. The Rights Plan expired on May
8, 2008.



| | ITEM 15. | CONTROLS AND PROCEDURES
| | -------- | -----------------------



Evaluation of Disclosure Controls and
Procedures



The Company maintains disclosure controls
and procedures that are designed to ensure that information required to be disclosed in our Exchange Act reports is recorded, processed,
summarized and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated
and communicated to our chief executive officer and chief financial officer to allow timely decisions regarding required disclosure.
Management, including our chief executive officer and our chief financial officer, after evaluating the effectiveness of our disclosure
controls and procedures (as defined in the U.S. Securities Exchange Act of 1934 under Rule 13a-15(e)) has concluded that our disclosure
controls and procedures were effective for 2012 and 2011.



Management’s Annual Report on
Internal Control Over Financial Reporting



Management, including the chief executive
officer and chief financial officer, is responsible for establishing and maintaining adequate internal control over financial reporting,
as defined under Exchange Act Rules 13a-15(f) and 15d-15(f). Internal control over financial reporting is a process designed to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external
purposes in accordance with accounting principles generally accepted in the United States. Internal control over financial reporting
includes those policies and procedures that: (i) pertain to the maintenance of records that, in reasonable detail, accurately and
fairly reflect the transactions and dispositions of our assets; (ii) provide reasonable assurance that transactions are recorded
as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that
receipts and expenditures are being made only in accordance with appropriate authorizations; and (iii) provide reasonable assurance
regarding prevention or timely detection of unauthorized acquisition, use, or disposition of assets that could have a material
effect on the financial statements.



Management assessed the effectiveness of
internal control over financial reporting as of December 31, 2012 and December 31, 2011. In conducting its assessment of internal
control over financial reporting, management based its evaluation on the framework in “Internal Control – Integrated
Framework” issued by the Committee of Sponsoring Organizations, or the COSO, of the Treadway Commission. Based on that assessment,
management has concluded that internal control over financial reporting was effective as of December 31, 2012 and December 31,
2011.



96







Pursuant to rules of the SEC, this annual
report does include an attestation report of the Company’s independent registered public accounting firm regarding internal
control over financial report.



There were no significant changes in internal
control over financial reporting that occurred during 2012 or 2011 that have materially affected, or are reasonably likely to materially
affect, our internal control over financial reporting.



| | ITEM 16. | RESERVED
| | -------- | --------



| | ITEM 16A. | AUDIT COMMITTEE FINANCIAL EXPERT
| | --------- | --------------------------------



The Board has determined that it has at
least two audit committee financial experts (as such term is defined in the rules and regulations of the SEC) serving on its Audit
Committee. Mr. David Fagin and Mr. Paul Zink have been determined to be such audit committee financial experts and are independent
as defined in National Instrument 58-101, meaning that, they have no direct or indirect relationship with the issuer which could,
in the view of the Board, reasonably be expected to interfere with the exercise of their independent judgment, and are not otherwise
deemed not to be independent. The SEC has indicated that the designation of an audit committee financial expert does not make Mr.
Fagin or Mr. Zink an “expert” for any purpose, impose on him any duties, obligations or liability that are greater
than the duties, obligations or liability imposed on him as a member of the Audit Committee and the Board in absence of such designation,
or affect the duties, obligations or liability of any other member of the Audit Committee or Board.



| | ITEM 16B. | CODE OF ETHICS
| | --------- | --------------



The Company has adopted the following code
of ethics that applies to all the Company’s officers, including the chief executive officer and the chief financial officer.
The Code of Ethics has been posted to the Company’s website at http://www.atna.com/i/pdf/CodeEthics.pdf.



It is the policy of the Company that all
officers, including the chief executive officer and the chief financial officer, adhere to and advocates the following principles
governing their professional and ethical conduct in the fulfillment of their responsibilities:



| | 1. | Act with honesty and integrity, avoiding actual or apparent conflicts between his or her personal,
private interest and the interest of the Company, including receiving improper personal benefits as a result of his or her position.
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 2. | Provide stakeholders with information that is accurate, complete, objective, relevant, timely and
understandable.
| | -- | -----------------------------------------------------------------------------------------------------------------



| | 3. | Comply with laws of federal, provincial and local governments applicable to the Company, and the
rules and regulations of private and public regulatory agencies having jurisdiction over the Company.
| | -- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 4. | Act in good faith, responsibly, with due care, and diligence, without misrepresenting or omitting
material facts or allowing independent judgment to be compromised.
| | -- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | 5. | Respect the confidentiality of information acquired in the course of the performance of his or
her responsibilities except when authorized or otherwise legally obligated to disclose. Do not use confidential information, acquired
in the course of the performance of his or her responsibilities, for personal advantage. Do not compete directly or indirectly
with the Company.
| | -- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



97







| | 6. | Proactively promote ethical behavior among subordinates and peers.
| | -- | ------------------------------------------------------------------



| | 7. | Use corporate assets and resources employed or entrusted in a responsible manner.
| | -- | ---------------------------------------------------------------------------------



| | 8. | Advance the Company’s legitimate interest and proactively promote high integrity as a responsible
member of his or her business team and/or in his or her work environment.
| | -- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | ITEM 16C. | PRINCIPAL ACCOUNTANT FEES AND SERVICES
| | --------- | --------------------------------------



Audit Fees



The appointment
of the Company’s auditor, EKS&H LLLP, was approved by the shareholders at the Annual General and Special Meeting held
June 5, 2012. For the years ended December 31, 2012 and 2011, fees charged by the Company’s external auditors are shown below.



|                                                         |  | 2012 |         |  | 2011 |  
|-------------------------------------------------------- |  | ---- | ------- |  | ---- | -
|                                                         |  |      |         |  |      |  
|Audit fees                                               |  | $    | 103,700 |  |      | $
|Tax fees                                                 |  |      | -       |  |      |  
|Internal control audit                                   |  | $    | 46,000  |  |      |  
|All other, including comfort letter for equity financing |  | $    | 20,500  |  |      | $



The Company’s
Audit Committee Charter incorporates the Company’s pre-approval policies and procedures. All services rendered by EKS&H
LLLP during 2012 and 2011 were approved by the Audit Committee pursuant to the pre-approval policies and procedures contained in
the Audit Committee Charter.



| | ITEM 16D. | EXEMPTION FROM THE LISTING STANDARDS FOR AUDIT COMMITTEES
| | --------- | ---------------------------------------------------------



Not Applicable.



| | ITEM 16E. | PURCHASES OF EQUITY SECURITIES BY THE ISSUER AND AFFILIATED
PURCHASERS
| | --------- | ----------------------------------------------------------------------



The Company
did not repurchase any of its shares in the fiscal years ended December 31, 2012 and 2011.



| | ITEM 16F. | CHANGE IN REGISTRANT’S CERTIFYING ACCOUNTANT
| | --------- | --------------------------------------------



Not Applicable.



| | ITEM 16G. | CORPORATE GOVERNANCE
| | --------- | --------------------



Not Applicable.



98







| | ITEM 16H. | MINE SAFETY DISCLOSURE
| | --------- | ----------------------



The information concerning mine safety
violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection
Act is attached hereto as Exhibit 16.1 and incorporated herein by reference.



PART III



| | ITEM 17. | FINANCIAL STATEMENTS
| | -------- | --------------------



Not applicable.



| | ITEM 18. | FINANCIAL STATEMENTS
| | -------- | --------------------



See the Exhibits listed in Item 19 of this
document and filed as part of this annual report.



The consolidated financial statements were
prepared in accordance with IFRS and are expressed in U.S. Dollars. For a history of exchange rates in effect for Canadian Dollars
as against U.S. Dollars, see Item 3.A, titled “Selected Financial Data”.



| | ITEM 19. | EXHIBITS
| | -------- | --------



|Exhibit 1.1  |  |  | BC Business Corporation Act – Articles of Incorporation (Filed as Exhibit 99.0 to the Company’s Annual Report on Form 20-F for the fiscal year ended December 31, 2007 (File No. 0-29336), and incorporated herein by reference).                                                                      |  |    
|------------ |  |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |  | ---
|Exhibit 3.1  |  |  | Employment Agreements for last two years. (Those for Hesketh,
    Gloss, and Stanley were filed as Exhibit 3.1 to the Company’s Annual Report on Form 20-F for the fiscal year ended
    December 31, 2011, and incorporated herein by reference.) Employment Agreement between Dan Samt Don and Atna. |  | (1)
|Exhibit 4.1  |  |  | Pinson Purchase Agreement (edited). (Filed as Exhibit 4.1 to the Company’s Annual Report on Form 20-F for the fiscal year ended December 31, 2011, and incorporated herein by reference.)                                                                                                              |  |    
|Exhibit 4.2  |  |  | Sprott Loan Agreement with Amendments of February 2012 and March 2013                                                                                                                                                                                                                                  |  | (1)
|Exhibit 4.3  |  |  | Gold Bond Agreement without attachments/exhibits. (Filed as Exhibit 4.3 to the Company’s Annual Report on Form 20-F for the fiscal year ended December 31, 2011, and incorporated herein by reference.)                                                                                                |  |    
|Exhibit 4.4  |  |  | Shareholder Rights Plan adopted in June 2012                                                                                                                                                                                                                                                           |  | (1)
|Exhibit 4.5  |  |  | Short Form Offering – September 2012                                                                                                                                                                                                                                                                   |  | (1)
|Exhibit 4.6  |  |  | Majority Voting & Advance Notice policies                                                                                                                                                                                                                                                              |  | (1)
|Exhibit 4.7  |  |  | DMC Mining Services – General Services Agreement Pinson                                                                                                                                                                                                                                                |  | (1)
|Exhibit 8.1  |  |  | List of Subsidiaries.                                                                                                                                                                                                                                                                                  |  | (1)
|Exhibit 12.1 |  |  | Section 302 Certifications by the chief executive officer and chief financial officer as required by rule 13a-14(a) or Rule 15d-14(a).                                                                                                                                                                 |  | (1)
|Exhibit 13.1 |  |  | Section 906 Certifications by the Chief Executive Officer and Chief Financial Officer as required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States code.                                                                                            |  | (1)
|Exhibit 14.1 |  |  | Consent of Independent Registered Public Accounting Firm EKS&H LLLP.                                                                                                                                                                                                                                   |  | (1)
|Exhibit 15.1 |  |  | Audited Consolidated Financial Statements and Notes thereto.                                                                                                                                                                                                                                           |  | (1)





99









|             |  | (i)   | Report of Independent Registered Public Accounting Firm EKS&H LLLP dated March 20, 2012.                                                                                                                                      |  | (1)
|------------ |  | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ---
|             |  | (ii)  | Consolidated Balance Sheets as at December 31, 2012 and 2011.                                                                                                                                                                 |  | (1)
|             |  | (iii) | Consolidated Statements of Operations for the years ended December 31, 2012, 2011 and 2010.                                                                                                                                   |  | (1)
|             |  | (iv)  | Consolidated Statements of Cash Flows for the years ended December 31, 2012, 2011 and 2010.                                                                                                                                   |  | (1)
|             |  | (v)   | Notes to Consolidated Financial Statements                                                                                                                                                                                    |  | (1)
|             |  | (vi)  | Consolidated Financial Statements Schedules are omitted because they are not applicable, not required or because the required information is included in the consolidated financial statements or notes thereto filed herein. |  | N/A
|Exhibit 15.2 |  |       | Management’s Discussion and Analysis for the years ended December 31, 2012 and 2011.                                                                                                                                          |  | (1)
|Exhibit 16.1 |  |       | Mine safety disclosure, as required by Section 1503 of the Dodd-Frank Wall Street Reform and Consumer Protection Act.                                                                                                         |  | (1)



|(1) | Attached hereto
|--- | ---------------



SIGNATURES



The registrant hereby certifies that it
meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this annual
report on its behalf.



ATNA RESOURCES LTD.



/s/ “James K.B. Hesketh”



James K.B. Hesketh

President and Chief Executive Officer

March 21, 2013



100