Osisko Director Resigns

MONTREAL, QUEBEC--(Marketwire - Aug. 22, 2011) - Osisko Mining Corporation ("Company") (TSX:OSK)(FRANKFURT:EWX) reports that Mr. André 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 necessity and would like to express our appreciation for his contribution over the past four years, as the Company progressed from the exploration phase to reaching full production and becoming a leading intermediate gold producer."

About Osisko Mining Corporation

Osisko Mining Corporation operates the Canadian Malartic Gold Mine in Malartic, Quebec and is pursuing exploration on a number of properties, including the Hammond Reef Gold Project in Northern Ontario. Canadian Malartic's production is 100% unhedged.