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CERTIFICATION

I, Steven Krause, certify that:

I have reviewed this annual report on Form 20-F of Pacific Rim
Mining Corp.;

1.      Based on my knowledge, this
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;

2.      Based on my knowledge, the
financial statements, and other financial information included in this annual
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;

3.      The issuers other
certifying officer(s) 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:

4.      (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 officer(s) 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 the 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.

|Date: July 24, 2009 | By: | Steven Krause        
|------------------- | --- | -----------------------
|                    |     | Steven Krause          
|                    |     | Chief Financial Officer

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