Osisko Mining Corp.

MONTREAL, QUEBEC -- (Marketwire) -- 08/31/11 -- Osisko Mining Corporation (the 'Corporation' or 'Osisko') (TSX: OSK)(FRANKFURT: EWX) and Energia y Minerales Sociedad Del Estado ('EMSE'), the La Rioja state mining corporation, are pleased to announce that they have entered into a binding agreement regarding the development of the Famatina gold project ('Famatina' or the 'Project') in La Rioja Province, Argentina

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MONTREAL, QUEBEC -- (Marketwire) -- 08/31/11 -- Osisko Mining Corporation ('Osisko')(TSX: OSK)(FRANKFURT: EWX) is pleased to announce that it has entered into an agreement with Caterpillar Financial ('Cat Financial') to increase its equipment leasing facility by US $56.3 million. The facility will be used to acquire additional mobile mining equipment fleet to develop the Canadian Malartic Mine and the Barnat gold

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MONTREAL, QUEBEC -- (Marketwire) -- 08/22/11 -- Osisko Mining Corporation ('Company') (TSX: OSK)(FRANKFURT: EWX) reports that Mr. Andre J. Douchane has tendered his resignation from the Board of Directors due to conflict of work commitments.

Victor H. Bradley, Chairman of the Board of Directors, commenting on Mr. Douchane's resignation: 'We are reluctant to see Mr. Douchane's resignation however we understand the

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MONTREAL, QUEBEC -- (Marketwire) -- 08/11/11 -- Osisko Mining Corporation (the 'Company' or 'Osisko') (TSX: OSK)(FRANKFURT: EWX) is pleased to report its review of activities and financial results for the quarter ended June 30, 2011.

Highlights

--  Commencement of commercial production at Canadian Malartic on May 19,
    2011
--  Gold production of 46,605 ounces
--  Continued progress in mill and mine ramp up

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MONTREAL, QUEBEC -- (Marketwire) -- 08/05/11 -- Osisko Mining Corporation ('Osisko')(TSX: OSK)(FRANKFURT: EWX), is pleased to announce that it has purchased back a 1% royalty interest from Geoconseils Jack Stoch Limitee in consideration for the issuance of 460,000 common shares of Osisko. This royalty was encumbering a portion of the Canadian Malartic and Barnat deposits and is part of a 2.5% Gross Metal Royalty

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MONTREAL, QUEBEC -- (Marketwire) -- 06/21/11 -- Osisko Mining Corporation (TSX: OSK)(FRANKFURT: EWX), the Board of Directors, management and staff are very proud to announce the declaration of commercial production at their flagship Canadian Malartic Mine located in Malartic, Quebec.

MONTREAL, QUEBEC -- (Marketwire) -- 06/17/11 -- Osisko Mining Corporation ('Osisko')(TSX: OSK)(FRANKFURT: EWX) has notified Clifton Star Resources Inc. of its decision to terminate its participation in the Duparquet Mining Camp Project in accordance with the Option and Joint Venture Agreement (the 'Agreement'). Under the terms of the Agreement, a 30-day notice is required prior to the termination becoming

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MONTREAL, QUEBEC -- (Marketwire) -- 06/14/11 -- Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) and Golden Valley Mines Ltd. (TSX VENTURE: GZZ) are pleased to announce final results from the 2010 drill program at the Jeffrey Zone on the Malartic CHL Property, currently under option from Golden Valley Mines Ltd. and located immediately east of Osisko's 100%-owned Canadian Malartic gold mine.

MONTREAL, QUEBEC -- (Marketwire) -- 06/13/11 -- Osisko Mining Corporation ('Osisko')(TSX: OSK)(FRANKFURT: EWX) and Clifton Star Resources Inc ('Clifton')(TSX VENTURE: CFO)(FRANKFURT: C3T) are pleased to provide an independent NI 43-101 compliant gold mineral resource estimate for the Beattie deposit at the Duparquet Project, located in the Abitibi region of Quebec. This estimate is restricted to the Beattie

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MONTREAL, QUEBEC -- (Marketwire) -- 05/31/11 -- Note to editors: There is a photo associated with this press release. Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX), a leader in exploration and mining in Quebec, proceeded yesterday with the official inauguration of the Canadian Malartic gold mine, a large-scale open pit mine located in Malartic, Abitibi.