MONTREAL, QUEBEC--(Marketwire - Jan. 12, 2012) - Osisko Mining Corporation (the "Company" or "Osisko") (TSX:OSK)(FRANKFURT:EWX) is pleased to report a preview of Canadian Malartic operational results for the quarter ended December 31, 2011.

Fourth Quarter Operating Highlights

• Gold production of 79,718 ounces
• Total gold production of 200,137 ounces for first partial year 2011
• Increase in grade mined in fourth quarter averaging 0.96 g/t Au
• Recoveries continue to be higher than feasibility modeling at 88.3 percent for fourth quarter
• Crusher construction 60 percent complete as of December 31^st and on schedule

Sean Roosen, President and Chief Executive Officer, commenting on the fourth quarter operating preview: "We saw steady increases in grade mined to average 0.96 g/t Au, which resulted in increased ounces produced in the fourth quarter. Recoveries also remain higher than anticipated in the feasibility study, averaging 88.3% over the past quarter. Construction of the pre-crush unit is progressing well and we anticipate its completion on schedule, which will allow us to achieve a strong operational year in 2012, our first full year of production."

Full operational and financial results for the fourth quarter 2011 will be made available on February 23^th, 2012.

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.

Mr. Luc Lessard, Eng., Senior Vice-President and COO of Osisko, is the Qualified Person who has reviewed this news release and is responsible for the technical information reported herein, including verification of the data disclosed.