UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



FORM 40-F



 ̈REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE

SECURITIES EXCHANGE ACT OF 1934



xANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF THE

SECURITIES EXCHANGE ACT OF 1934



For the fiscal year ended December 31, 2012            	Commission
File Number 001-33548










Jaguar Mining Inc.

(Exact name of Registrant as specified
in its charter)



|Ontario
        (Province or other Jurisdiction of
        Incorporation or Organization) | 1040
        (Primary Standard Industrial
        Classification Code Number) | 98-6396253
        (I.R.S. Employer Identification No.)
|----------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------- | -------------------------------------------------------



67 Yonge Street, Suite 1203Toronto, Ontario M5E 1J8 Canada

(647) 494-5524

(Address and telephone number of Registrants’
principal executive offices)



Hickley, Allen & Snyder LLP

43 Main Street

Concord, New Hampshire

U.S.A. 03301

(603) 225-4334

(Name, address (including zip code) and
telephone number

(including area code) of agent for service
in the United States)










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



|Title
        of Each Class |  | Name of Each Exchange
        on which
        Registered
|--------------------------- |  | ---------------------------------------------------------
|Common Shares, No Par Value |  | NYSE                                                     



Securities registered or to be registered
pursuant to Section 12(g) of the Act: None



Securities for which there is a reporting
obligation pursuant to Section 15(d) of the Act: None



For annual reports, indicate by check mark
the information filed with this Form:



| | x  Annual information form | x  Audited annual financial statements
| | -------------------------- | --------------------------------------



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:



The Registrant had 84,409,648 Common Shares
outstanding as at December 31, 2012



Indicate by check mark
whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Exchange Act 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.



| | Yes x |  | 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           ̈











Principal
Documents



The following documents that are filed as exhibits to this annual
report are incorporated by reference herein:



| | ● | the Registrant’s Annual Information Form for the fiscal year ended December 31, 2012;
| | - | -------------------------------------------------------------------------------------

| | ● | the Registrant’s Audited Consolidated Financial Statements for the fiscal years ended December 31, 2012 and 2011; and
| | - | ---------------------------------------------------------------------------------------------------------------------

| | ● | the Registrant’s Management’s Discussion and Analysis for the fiscal year ended December 31, 2012.
| | - | --------------------------------------------------------------------------------------------------



Disclosure
Controls and Procedures



Based on their evaluation as of the end
of the period covered by this report, the Registrant’s Chief Executive Officer and Chief Financial Officer have concluded
that the Registrant’s disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act
are effective to ensure that information required to be disclosed by the Registrant in reports that it files or submits under the
Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission
(“SEC”) rules and forms.



Management’s Annual
Report on Internal Control over Financial Reporting



Management of the Registrant is responsible
for establishing and maintaining adequate internal control over the Registrant’s financial reporting (as such term is defined
in Rules 13a-15(f) and 15d-15(f) under the Exchange Act). Internal control over financial reporting is designed to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements in accordance with generally
accepted accounting principles. The Registrant’s Chief Executive Officer and principal financial officer have assessed the
effectiveness of the Registrant’s internal control over financial reporting as at December 31, 2012 in accordance with Internal
Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this
assessment, the Registrant's Chief Executive Officer and the principal financial officer have determined that the Registrant’s
internal control over financial reporting was effective as of December 31, 2012.



The Registrant’s auditor has attested
to management's internal control over financial reporting for the year ended December 31, 2012. The auditor’s attestation
report on management's assessment of the Registrant's internal control over financial reporting is included in Exhibit 99.1 to
this annual report on Form 40-F, which is incorporated by reference herein.



Changes in Internal Control
Over Financial Reporting



There were no changes in the Registrant’s
internal control over financial reporting that occurred during the period covered by this report that have materially affected
or are reasonably likely to materially affect the Registrant’s internal control over financial reporting.



Attestation Report of Registrant’s
Public Accounting Firm



KPMG LLP (“KPMG”), the independent
registered public accounting firm of the Registrant, has issued an attestation report on the effectiveness of the internal control
over financial reporting of the Registrant as of December 31, 2012. For a copy of KPMG’s report see Exhibit 99.1 to this
annual report on Form 40-F, which is incorporated by reference herein.



Notice of Pension Fund Blackout
Period Pursuant To Regulation BTR



The Registrant was not required by Rule
104 of Regulation BTR to send any notice to
any of its directors or executive officers during the fiscal year ended December 31, 2012.



Audit Committee Financial
Expert



The Board of Directors of the Registrant
has determined that each of Messrs. Andy Burns, Anthony Griffiths and Gil Clausen, individuals serving on the Audit Committee of
the Registrant’s Board of Directors, is an audit committee financial expert, within the meaning of General Instruction B(8)(b)
of Form 40-F. Each of Messrs. Burns, Griffiths and Clausen is independent, as that term is defined in the rules of the NYSE.















The SEC has indicated that the designation
of a person as an audit committee financial expert does not make such person an “expert” for any purpose, impose any
duties, obligations or liability on such person that are greater than those imposed on members of the Audit Committee and the Board
of Directors who do not carry this designation or affect the duties, obligations or liability of any other member of the Audit
Committee or Board of Directors.



Code Of Ethics



The Registrant has adopted a code of ethics
(as that term is defined in Form 40-F) that applies to all of its directors, officers and employees. The code of ethics has been
posted to the Registrant’s website at www.jaguarmining.com.



Principal Accountant Fees
And Services



The Registrant has paid KPMG, its external auditors, the following
fees in each of the last two fiscal periods.



Audit Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2012 and December 31, 2011 for professional services rendered by KPMG for the audit of the Registrant’s
annual financial statements or services that are normally provided by KPMG in connection with statutory and regulatory filings
or engagements for such fiscal years were Cdn.$804,000
and Cdn.$839,150, respectively.



Audit-Related Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2012 and December 31, 2011 for assurance and related services rendered by KPMG that are reasonably
related to forensic services and are not reported above as audit fees were Cdn.$nil
and $127,299, respectively.



Tax Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2012 and December 31, 2011 for professional services rendered by KPMG for tax compliance, tax advice,
tax planning and other services were Cdn.$nil
and Cdn.$nil, respectively.



All Other Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2012 and December 31, 2011 for services other than those reported under “Audit Fees”,“Audit-Related Fees”,and “Tax Fees” were Cdn.$nil
and Cdn.$nil, respectively. Other services provided included advice
related to the conversion to IFRS.



Audit Committee Approval



The Registrant’s audit committee
pre-approves every engagement by KPMG to render audit or non-audit services. All of the services described above were approved
by the audit committee.



Off-Balance Sheet Arrangements



The Registrant is not a party to any off-balance
sheet arrangements that have or are reasonably likely to have a current or future effect on its financial condition, changes in
financial condition, revenues or expenses, results of operations, liquidity, capital expenditures or capital resources that is
material to investors.



Tabular Disclosure Of Contractual
Obligations



The Registrant’s contractual obligations
as at December 31, 2012 are summarized in its Management’s Discussion and Analysis of Financial
Condition and Results of Operations for the fiscal year ended December 31, 2012, attached as Exhibit 99.3 hereto, under the heading
“Financial Condition, Cash Flow, Liquidity and Capital Resources”and are incorporated
herein by reference.











Identification of Audit
Committee



The Registrant
has an audit committee comprised of the following three individuals, all of who are independent as that term is defined under the
rules of the NYSE: Messrs.Burns, Griffiths and Clausen.



Critical Accounting Policies



A discussion of the Registrant’s
critical accounting policies can be found in its Management’s Discussion and Analysis of Financial Condition and Results
of Operations for the fiscal year ended December 31, 2012, attached as Exhibit 99.3 hereto, under the heading “Critical
Accounting Policies”.



InteractiveData File



The Registrant is not currently required
to submit to the Commission, nor post to its corporate website, an Interactive Data File.



Mine Safety



The Registrant is not currently required
to disclose the information required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act.



Disclosure Required Pursuant
to the NYSE



The Registrant is classified as a foreign
private issuer under U.S. securities law and its common shares are listed on the NYSE. Pursuant to the rules of the NYSE, a foreign
private issuer is permitted, subject to a few exceptions, to follow home country practice in lieu of the corporate governance rules
of the NYSE. The only corporate governance practice of the Registrant that differs from those required by the NYSE rules to be
followed by U.S. domestic issuers is the quorum requirement found in Section 5.3(c) of the NYSE rules, rule provide that a quorum
for any meeting of shareholders may not consist of less than 33.33% of the common shares issued and outstanding. The Registrant’s
by-laws require that a quorum for any meeting of shareholders may not consist of less than 15% of the common shares issued and
outstanding. This policy is consistent with requirements of the Toronto Stock Exchange and applicable corporate laws in Ontario.











UNDERTAKING AND CONSENT TO SERVICE OF
PROCESS



| | A. | Undertaking
| | -- | -----------



The Registrant undertakes
to make available, in person or by telephone, representatives to respond to inquiries made by SEC staff, and to furnish promptly,
when requested to do so by SEC staff, information relating to the securities in relation to which the obligation to file an annual
report on Form 40-F arises or transactions in such securities.



| | B. | Consent to Service of Process
| | -- | -----------------------------



The Registrant has
previously filed with the SEC a Form F-X in connection with its common shares. Any change to the name or address of the agent for
service of process shall be communicated promptly to the SEC by an amendment to the Form F-X.











SIGNATURE



Pursuant to the requirements
of the Exchange Act, the Registrant certifies that it meets all of the requirements for filing on Form 40-F and has duly caused
this annual report to be signed on its behalf by the undersigned, thereto duly authorized.



|               | JAGUAR MINING INC. |                               
|-------------- | ------------------ | ------------------------------
|               |                    |                               
|March 22, 2013 | By:                | /s/ David M. Petroff          
|               |                    | Name: /s/ David M. Petroff    
|               |                    | Title: Chief Executive Officer











EXHIBIT INDEX



|Exhibit No. |  | Title                                                                                                                                                                                                                                                              
|----------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|            |  |                                                                                                                                                                                                                                                                    
|23.1        |  | Consent of KPMG LLP.                                                                                                                                                                                                                                               
|            |  |                                                                                                                                                                                                                                                                    
|23.2        |  | Consent of Wilson Miola.                                                                                                                                                                                                                                           
|            |  |                                                                                                                                                                                                                                                                    
|31          |  | Certification of the Chief Executive Officer and Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                                                                
|            |  |                                                                                                                                                                                                                                                                    
|32          |  | Certification of the Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                                                                                                                
|            |  |                                                                                                                                                                                                                                                                    
|99.1        |  | Audited Annual Financial Statements at December 31, 2012 and 2011 and for the years then ended together
    with the auditor's report thereon and the notes thereto, including the auditors’ report on the Company’s internal
    control over financial reporting.
|            |  |                                                                                                                                                                                                                                                                    
|99.2        |  | Management’s Discussion and Analysis for the years ended December 31, 2012.                                                                                                                                                                                        
|            |  |                                                                                                                                                                                                                                                                    
|99.3        |  | The Annual Information Form of the Registrant for the year ended December 31, 2012.