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copper MOUNTAIN FILES PRELIMINARY PROSPECTUS

Vancouver, British Columbia - September 4, 2009 - Copper Mountain Mining Corporation (TSX: CUM) (the "Company" or "Copper Mountain") announces that it has filed a preliminary short form prospectus with regulatory authorities in Canada in respect of a $50 million treasury offering of common shares.  A syndicate led by BMO Capital Markets and including Canaccord Adams, Jennings Capital Inc. and Wellington West Capital Markets Inc. are acting as underwriters in connection with the offering.  The number of common shares to be distributed and the price of each common share will be determined in the context of the market. The underwriters will have an option, exercisable for a period of 30 days from the date of closing, to purchase up to a further 15% in additional common shares at a price equal to the offering price to cover over-allotments and for market stabilization purposes.

The Company plans to use the net proceeds from the financing to further the development of the Copper Mountain Project and for general corporate purposes.

The offering is subject to certain conditions including, but not limited to, the entering into by the Company and the underwriter of an underwriting agreement and the receipt of all necessary approvals, including the approval of the Toronto Stock Exchange. The preliminary short form prospectus has been filed on SEDAR at www.sedar.com.

This press release is not an offer to sell or the solicitation of an offer to buy the securities, nor shall there be any sale of the securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to qualification or registration under the securities laws of such jurisdiction. The securities being offered have not been, nor will they be, registered under the United States Securities Act of 1933, as amended, and such securities may not be offered or sold within the United States or to, or for the account or benefit of, U.S. persons absent registration or an applicable exemption from U.S. registration requirements.

About Copper Mountain Mining Corporation:

Copper Mountain is a Canadian resource company managed by an experienced team of professionals with a solid track record of exploration and development success.  The Company's shares trade on the Toronto Stock Exchange under the symbol "CUM".  Copper Mountain owns 75% and Mitsubishi Materials Corporation owns 25% of the Copper Mountain Project.  The  18,000 acre mine site is located 15 km south of the town of Princeton in southern British Columbia.  The Copper Mountain Project is a past producer of 1.7 billion pounds of Copper that closed in 1996, and therefore, there is significant developed infrastructure on site that the Company can build upon.  The Copper Mountain Project has a current resource of approximately 5 Billion pounds of copper and it is Copper Mountain's goal to develop the Copper Mountain Project as a mid tier copper and precious metal mine to produce approximately 100 million pounds of copper per year by mid 2011.  Additional information is available on the Company's web page at www.CuMtn.com. 

On behalf of the Board of

COPPER MOUNTAIN MINING CORPORATION

 "Rod Shier"                                                                                                                                              

Rod Shier

Chief Financial Officer

For further information, please contact:
Don Graham: Director, Investor Relations 604 682 2992 ext. 224
Email: don@CuMtn.com
or B&D Capital 604-685-6465

Website: www.CuMtn.com

Note:  This release contains forward-looking statements that involve risks and uncertainties.  These statements may differ materially from actual future events or results.  Readers are referred to the documents, filed by the Company on SEDAR at www.sedar.com, specifically the most recent reports which identify important risk factors that could cause actual results to differ from those contained in the forward-looking statements.  The Company undertakes no obligation to review or confirm analysts' expectations or estimates or to release publicly any revisions to any forward-looking statement.

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