Exhibit 31.2



Certification of Gilmour Clausen pursuant
to Rule 13(a) – 14(a) of the
Securities Exchange Act of 1934, as amended



I, Gilmour Clausen, certify that:



1.          I
have reviewed this annual report on Form 40-F of Jaguar Mining Inc.;



2.          Based
on my knowledge, this annual report does not contain any untrue statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to
the period covered by this report;



3.          Based
on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material
respects the financial condition, results of operations and cash flows of the issuer as of, and for, the periods presented in this
report;



4.          The
issuer's other certifying officers and I are responsible for establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act
Rules 13a-15(f) and 15d-15(f)) for the issuer and have:



(a)         Designed
such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision,
to ensure that material information relating to the issuer, including its consolidated subsidiaries, is made known to us by others
within those entities, particularly during the period in which this report is being prepared;



(b)         Designed
such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial
statements for external purposes in accordance with generally accepted accounting principles;



(c)         Evaluated
the effectiveness of the issuer's disclosure controls and procedures and presented in this report our conclusions about the effectiveness
of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and



(d)         Disclosed
in this report any change in the issuer's internal control over financial reporting that occurred during the period covered by
the annual report that has materially affected, or is reasonably likely to materially affect, the issuer's internal control over
financial reporting; and



5.          The
issuer's other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial
reporting, to the issuer's auditors and the audit committee of issuer's board of directors (or persons performing the equivalent
functions):



(a)         All
significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which
are reasonably likely to adversely affect the issuer's ability to record, process, summarize and report financial information;
and



(b)         Any
fraud, whether or not material, that involves management or other employees who have a significant role in the issuer's internal
control over financial reporting.



|Dated: March 23, 2012                | 
|------------------------------------ | 
|                                     | 
|/s/ Gilmour Clausen                  | 
|                                     | 
|Gilmour Clausen                      | 
|Member of the Office of the Chairman |