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, 2011 | 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.)
|------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------- | -------------------------------------------------------



122 North Main Street, 2nd Floor
Concord, New Hampshire 03301

(603) 410-4888

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



Hinckley, 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 84,409,648Common Shares outstanding as at December 31, 2011



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, 2011;
| | - | -------------------------------------------------------------------------------------

| | · | the Registrant’s Audited Consolidated Financial Statements for the fiscal years ended December
31, 2011 and 2010; and
| | - | ---------------------------------------------------------------------------------------------------------------------

| | · | the Registrant’s Management’s Discussion and Analysis for the fiscal years ended December
31, 2011 and 2010.
| | - | ------------------------------------------------------------------------------------------------------------



Disclosure Controls and
Procedures

Based on their evaluation as of the end
of the period covered by this report, the members of the Registrant’s Office of the Chairman and the 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) of 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 members of the Registrant’s Office of the Chairman and the principal financial officer
have assessed the effectiveness of the Registrant’s internal control over financial reporting as of December 31, 2011 in
accordance with the Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway
Commission. Based on this assessment, the members of the Registrant’s Office of the Chairman and principal financial officer
have determined that the Registrant’s internal control over financial reporting was effective as of December 31, 2011 and
have certified the Registrant’s annual filing with the SEC on Form 40-F as required by the United States Sarbanes-Oxley Act
and with Canadian securities regulatory authorities.



Management of the Registrant reviewed the
results of management’s assessment with the Audit Committee of the Registrant’s Board of Directors.



Changes in Internal Control Over Financial
Reporting

There was no change in the Registrant’s
internal control over financial reporting that occurred during the period covered by this report that has materially affected or
is 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, 2011. For 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, 2011.



Audit Committee Financial
Expert



The Board of Directors of the Registrant
has determined that each of Gary German, Anthony Griffiths and Andrew Burns, 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. German, Griffiths and Burns is independent, as that term is defined in the rules of the New York
Stock Exchange (“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, 2011 and December 31, 2010 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.$826,400
and Cdn.$655,700, respectively.



Audit-Related Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2011 and December 31, 2010 for assurance and related services rendered by KPMG that are reasonably
related to the performance of the audit or review of the Registrant’s financial statements and are not reported above as
audit fees were Cdn.$nil.



Tax Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2011 and December 31, 2010 for professional services rendered by KPMG for tax compliance, tax advice,
tax planning and other services were Cdn.$nil
and Cdn.$18,100, respectively.



All Other Fees



The aggregate fees billed by KPMG for the
fiscal years ended December 31, 2011 and December 31, 2010 for services other than those reported under “Audit Fees”,“Audit-Related Fees”,and “Tax Fees” were Cdn.$192,200
and Cdn.$246,500, respectively. Other provided included advice related to the conversion toIFRS.



Audit Committee Approval



The Registrant’s audit committee
approves every significant 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, 2011 are summarized in its Management’s Discussion and Analysis of Financial
Condition and Results of Operations for the fiscal year ended December 31, 2011, attached as Exhibit 99.3 hereto, under the heading
“Financial Condition, Cash Flow, Liquidity and Capital Resources – Contractual Obligations”
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 by the rules of the NYSE: Messrs. Gary German,
Anthony Griffiths and Andrew Burns.



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, 2011, attached as Exhibit 99.2 hereto, under the heading “Critical
Accounting Policies”.



Disclosure
Required Pursuant to the NYSE



The Registrant is classified as a foreign
private issuer under US 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 found in Section 5.3(c) of the NYSE rules which rule provides 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.











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.
|------------- |  | ------------------
|              |  |                   
|              |  |                   
|March23, 2012 |  | By:               
|              |  |                   
|              |  |                   











EXHIBIT INDEX



|Exhibit No. |  | Title                                                                                                                                                                                                                                                                                                                        
|----------- |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|            |  |                                                                                                                                                                                                                                                                                                                              
|23.1        |  | Consent of KPMG LLP.                                                                                                                                                                                                                                                                                                         
|            |  |                                                                                                                                                                                                                                                                                                                              
|23.2        |  | Consent of Wilson Miola.                                                                                                                                                                                                                                                                                                     
|            |  |                                                                                                                                                                                                                                                                                                                              
|31.1        |  | Certification of Gary E. German pursuant to Rule 13(a) - 14(a)
        of the Securities Exchange Act of 1934, as amended.                                                                                                                                                                                                   
|            |  |                                                                                                                                                                                                                                                                                                                              
|31.2        |  | Certification of Gilmour Clausen pursuant to Rule 13(a) - 14(a) of the Securities Exchange Act of 1934, as amended.                                                                                                                                                                                                          
|            |  |                                                                                                                                                                                                                                                                                                                              
|31.3        |  | Certification of John Andrews pursuant to Rule 13(a) - 14(a) of the Securities Exchange Act of 1934, as amended.                                                                                                                                                                                                             
|            |  |                                                                                                                                                                                                                                                                                                                              
|31.4        |  | Certification of James M. Roller pursuant to Rule 13(a) - 14(a) of the Securities Exchange Act of 1934, as amended.                                                                                                                                                                                                          
|            |  |                                                                                                                                                                                                                                                                                                                              
|32          |  | Certification of the members of the Office of the Chairman and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                            
|            |  |                                                                                                                                                                                                                                                                                                                              
|99.1        |  | Audited Annual Financial Statements at December 31, 2011 December 31, 2010 and January 1,
    2010 and for the years ended December 31, 2011 and December 31, 2010
    together with the auditor’s report thereon and the notes thereto, including the auditor’s report on the internal
    control over financial reporting.
|            |  |                                                                                                                                                                                                                                                                                                                              
|99.2        |  | Management’s Discussion and Analysis for the years ended December 31, 2011 and 2010.                                                                                                                                                                                                                                         
|            |  |                                                                                                                                                                                                                                                                                                                              
|99.3        |  | The Annual Information Form of the Registrant for the year ended December 31, 2011.