Pacific Rim Mining Closes Private Placement Financing

VANCOUVER, BRITISH COLUMBIA -- (Marketwire) -- 10/08/10 -- Pacific Rim Mining Corp. ('Pacific Rim' or 'the Company') (TSX: PMU)(OTCQX: PFRMF) has closed its previously announced private placement financing. A total of CDN $3,332,000 was raised through the issuance of 19,600,000 units ('Units') of the Company, each Unit consisting of one share (a 'Share') and one-half of one share purchase warrant (each whole warrant, a 'Warrant'). Details of the terms of the financing are available in the Company's news release # 10-12 dated September 21, 2010.

The Company has also issued 660,000 Units (the 'Finder's Units') to certain finders (the 'Finders') in connection with the private placement, in payment of a finder's fee of 6% of the proceeds raised from subscribers introduced by the Finders, and issued 660,000 warrants to the Finders (the 'Finder's Warrants') representing 6% of the total number of Units sold to purchasers introduced by the Finders.

The Shares, the Warrants, the shares and warrants forming part of the Finder's Units, and the Finder's Warrants, and any securities issuable on exercise thereof (collectively the 'Securities') are subject to a four-month hold as required under applicable Canadian securities law, expiring on February 9, 2011.

The proceeds of the financing will be used for exploration work, legal expenditures and for general corporate purposes.

The Securities are not currently qualified by prospectus or registered under the U.S. Securities Act of 1933, as amended (the 'Securities Act'), or the laws of any state, and may not be offered or sold in the United States, or to, or for the account or benefit of U.S. persons (as defined in Rule 902(k) of Regulation S under the Securities Act) or persons in the United States absent registration or an applicable exemption from the registration requirements. The Securities are subject to resale restrictions under applicable securities laws.

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 most advanced asset is the high grade, vein-hosted El Dorado gold project in El Salvador. The Company recently announced its signing of a binding letter of intent to acquire and explore the Remance gold project in Panama. Pacific Rim also owns several grassroots gold projects in El Salvador and continues to seek additional assets elsewhere in the Americas that fit its focus. Pacific Rim's shares trade on the Toronto Stock Exchange under the symbol PMU and on the OTCQX market in the US under the symbol PFRMF.

On behalf of the board of directors,

Thomas C. Shrake, President and CEO

Cautionary Note Regarding 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: factors that may influence the eventual use of proceeds as described. 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 statements. Pacific Rim's actual results, programs and financial position could differ materially from those expressed in or implied by these forward-looking statements.

The TSX has neither reviewed nor accepts responsibility for the adequacy or accuracy of this release.

Contacts:

Pacific Rim Mining Corp.

Thomas C. Shrake

President and CEO

604-689-1976 or 1-888-775-7097

(604) 689-1978 (FAX)
general@pacrim-mining.com
www.pacrim-mining.com