Osisko Nominates Michele Darling to Board of Directors

MONTREAL, QUEBEC--(Marketwire - April 17, 2012) - Osisko Mining Corporation ("Company") (TSX:OSK)(FRANKFURT:EWX) is pleased to announce that Ms. Michele Darling has accepted to be a nominee for the election to the Board of Directors.

Messrs. Victor Bradley, Staph Leavenworth Bakali, Marcel Côté, William A. MacKinnon, Sean Roosen, Gary Sugar, Serge Vézina and Robert Wares, current directors, have also accepted to be nominees.

The directors' election will take place during the Annual Shareholders Meeting to be held on May 10, 2012 at 4:00 PM at Le Centre Sheraton Montreal, 1201 René-Lévesque blvd. West, Montréal (Québec).

Ms. Darling has over thirty years of global business experience with particular expertise in Human Resources Management and Corporate Governance. She is the President of Michele Darling and Associates Inc. and provides human resources and strategic planning consulting services to Canadian and American businesses. Prior to establishing her consulting practice, Ms. Darling was Executive Vice President, Corporate Governance with Prudential Financial Inc. from 1996-2002. She played a very significant role in the transformation of Prudential Financial from a mutual company into a public company, and was honored as Human Resources Executive of the Year in 2000. From 1991-1996, she was the Executive Vice President Human Resources at Canadian Imperial Bank of Commerce, having joined the bank in corporate banking. Ms. Darling is currently a member of the Board of Advisors for Hewitt Equipment Limited, the Denihan Hospitality Group (New York) and The Pickseed Group of Companies. She is the Chair of The Credit Hospital Foundation and is the Founder and Chair of The Halo Foundation. She is the Benefactor of The Darling Home For Kids and is a Governor of The Shaw Festival Theatre.

Ms. Darling holds a Bachelor of Arts (Honours) degree from the University of Sydney (Australia) and obtained her Master's degree in Education from the University of Toronto. She is a Certified Human Resources Professional.

About Osisko Mining Corporation

Osisko Mining Corporation operates the Canadian Malartic Gold Mine in Malartic, Québec 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.