Brett Resources Inc. Shareholders Approve Plan of Arrangement With Osisko Mining Corp.

Vancouver, 08/12/10 - Osisko Mining Corporation ('Osisko') (TSX: OSK) (FRANKFURT: EWX) and Brett Resources Inc. ('Brett') (TSX VENTURE: BBR) (FRANKFURT: A4N) are pleased to announce that their previously announced Plan of Arrangement (the 'Arrangement') has been approved by the shareholders of Brett at a special meeting of Brett shareholders held on August 11, 2010.

On August 12, 2010, the Supreme Court of British Columbia issued a final order approving the Arrangement. The Arrangement is expected to become effective on or about August 13, 2010. The common shares of Brett (the 'Brett Shares') are expected to be de-listed from the TSX Venture Exchange two or three business days following the effective date of the Arrangement. In addition, Brett intends to apply to the relevant provincial securities regulators to cease to be a reporting issuer.

Under the terms of the Arrangement, each Brett shareholder will receive 0.34 Osisko common shares and $0.0001 in cash for each Brett Share held (the 'Exchange Consideration'). The Exchange Consideration is the same consideration that Osisko offered and paid under its offer dated April 13, 2010 (the 'Offer'). The Arrangement constitutes the subsequent acquisition transaction, as contemplated under the Offer, by which Osisko will acquire all of the remaining Brett Shares not already owned by Osisko.

In order to receive the Exchange Consideration, former Brett shareholders that held their Brett Shares registered in their names, must complete the letter of transmittal which accompanied the Brett information circular dated July 13, 2010 and deposit it, together with their Brett share certificates, with CIBC Mellon Trust Company. Complete instructions are set out in the information circular and the accompanying letter of transmittal. The information circular and a copy of the letter of transmittal are available on Brett's profile at www.sedar.com. Former Brett shareholders who held their Brett shares through intermediary banks or brokerage houses should contact their bank or broker to determine what action, if any, they need to take to receive the Exchange Consideration.


About Osisko Mining Corporation

Osisko Mining Corporation is currently developing the Canadian Malartic gold deposit and evaluating adjacent areas for a large-scale open pit, bulk-tonnage mining operation. The Canadian Malartic deposit currently represents one of the biggest gold reserves in Canada for a single deposit, and is still growing through ongoing drilling on new mineralized zones.


About Brett Resources Inc.

Brett Resources Inc. is a Canadian minerals exploration company whose primary mandate is the discovery, acquisition, and development of precious metals systems, with particular expertise in Canada and Latin America. Since 2006 Brett's primary focus has been the 100 percent owned Hammond Reef Gold Deposit in Ontario.


Forward-Looking Information

Certain statements contained in this press release may be deemed 'forward-looking statements'. All statements in this release, other than statements of historical fact, that address events or developments that Osisko and Brett expect to occur, are forward looking statements. Forward looking statements are statements that are not historical facts and are generally, but not always, identified by the words 'expects', 'plans', 'anticipates', 'believes', 'intends', 'estimates', 'projects', 'potential', 'scheduled' and similar expressions, or that events or conditions 'will', 'would', 'may', 'could' or 'should' occur. Although Osisko and Brett believe the expectations expressed in such forward-looking statements are based on reasonable assumptions, including, without limitation that all technical, economical and financial conditions will be met in order to put the Canadian Malartic Project and the Hammond Reef Gold Project into commercial production, such statements are not guarantees of future performance and actual results may differ materially from those in forward looking statements. Factors that could cause the actual results to differ materially from those in forward-looking statements include gold prices, access to skilled consultants, mining development and mill production personnel, results of exploration and development activities, Osisko and Brett's limited experience with production and development stage mining operations, uninsured risks, regulatory changes, defects in title, availability of personnel, materials and equipment, timeliness of government approvals, actual performance of facilities, equipment and processes relative to specifications and expectations, unanticipated environmental impacts on operations market prices, continued availability of capital and financing and general economic, market or business conditions. These factors are discussed in greater detail in Osisko and Brett's most recent Annual Information Forms, both of which are filed on SEDAR, which also provide additional general assumptions in connection with these statements. Osisko and Brett caution that the foregoing list of important factors is not exhaustive. Investors and others who base themselves on the forward-looking statements contained herein should carefully consider the above factors as well as the uncertainties they represent and the risk they entail. Osisko and Brett believe that the expectations reflected in those forward-looking statements are reasonable, but no assurance can be given that these expectations will prove to be correct and such forward-looking statements included in this press release should not be unduly relied upon. These statements speak only as of the date of this press release.

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.



Contacts:

Osisko Mining Corporation
John Burzynski, Vice-President Corporate Development
(416) 363-8653

Sylvie Prud'homme, Manager, Investor Relations
(514) 735-7131
Toll Free: 1 (888) 674-7563

Brett Resources Inc.
Connie Norman, Corporate Secretary