Resolution to Extend Expiration Date of Warrants Passed at Pacific Rim Annual and Special General Meeting

VANCOUVER, BRITISH COLUMBIA, Aug 27 (MARKET WIRE) --
Pacific Rim Mining Corp. ("Pacific Rim" or the "Company") (TSX: PMU)(NYSE
Amex: PMU) announces that at its Annual and Special General Meeting of
shareholders, held in Vancouver, Canada on Wednesday August 26, 2009, a
resolution to extend the expiry date of certain share purchase and
finders' warrants was passed by a majority of shareholder votes cast.

The warrants were issued in conjunction with a private placement
financing undertaken by the Company that closed on February 29, 2008 (the
details of which are available in the Company's news release #08-05
available on its website www.pacrim-mining.com or at SEDAR www.sedar.com)
and consist of 6,711,000 share purchase warrants and 350,350 finders'
warrants. As per the resolution approved at the Company's Annual and
Special General Meeting, the expiry date of these warrants was extended
from August 29, 2009 to August 29, 2010. A total of 846,000 of the
warrants are held by insiders of the Company as disclosed in the
Company's Information Circular dated July 22, 2009.

About the Company

Pacific Rim is an environmentally and socially responsible exploration
company focused exclusively on high grade, environmentally clean gold
deposits in the Americas. Pacific Rim's primary asset and focus of its
growth strategy is the high grade, vein-hosted El Dorado gold project in
El Salvador. The Company owns several similar grassroots gold projects in
El Salvador and is actively seeking additional assets elsewhere in the
Americas that fit its project focus. Pacific Rim's shares trade under the
symbol PMU on both the Toronto Stock Exchange ("TSX") and the NYSE Amex
("NYX"). All references to "Pacific Rim" or "the Company" encompass the
Canadian corporation, Pacific Rim Mining Corp, and its U.S. and
Salvadoran subsidiaries, Pac Rim Cayman LLC, Pacific Rim El Salvador,
S.A. de C.V., and Dorado Exploraciones, S.A. de C.V., inclusive.

On behalf of the board of directors,

Thomas C. Shrake, President and CEO

Forward-Looking Information

Information set forth in this document may involve forward-looking
statements. By their nature, forward-looking statements are subject to
numerous risks and uncertainties, some of which are beyond Pacific Rim's
control, including: the eventual expiry date of the warrants; the status
of the Company's exploration projects; and, the focus of its project
generation efforts. Readers are cautioned that the assumptions used in
the preparation of such information, although considered reasonable at
the time of preparation, may prove to be imprecise and, as such, undue
reliance should not be placed on forward-looking information. Pacific
Rim's actual results, programs and financial position could differ
materially from those expressed in or implied by these forward-looking
statements. Readers are urged to thoroughly review the Company's Risks
and Uncertainties as outlined in its 2009 Annual Report.

The TSX and
the NYX have neither reviewed nor accept responsibility for the adequacy
or accuracy of this release.

Contacts:
Pacific Rim Mining Corp.
Barbara Henderson
604-689-1976 or 1-888-775-7097
604-689-1978 (FAX)
general@pacrim-mining.com
www.pacrim-mining.com

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