Osisko Sets New One-Day Gold Production Record at Canadian Malartic

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MONTREAL, QUEBEC--(Marketwired - May 21, 2014) - Osisko Mining Corporation ("Osisko" or the "Company") (TSX:OSK)(FRANKFURT:EWX) is pleased to announce that it has achieved record one-day gold production of 2,718 ounces at its Canadian Malartic mine.

The record daily production was achieved on May 14th, with daily throughput of 51,601 tonnes, recovery of 93.3% and a head grade of 1.76 g/t Au.

Osisko would also like to remind shareholders that Osisko's Annual and Special meeting will be held on May 30, 2014 at 1:30 pm at the Fairmont Queen Elizabeth Hotel in Montreal. Shareholders are invited to approve the Plan of Arrangement for the Yamana and Agnico-Eagle transaction.

About Osisko Mining Corporation

Osisko operates the Canadian Malartic mine in Malartic, Québec and is pursuing exploration on a number of properties in Ontario, Canada and Mexico.

Mr. Luc Lessard, Eng., Senior Vice-President and Chief Operating Officer 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.

John Burzynski
Vice-President Corporate Development
(416) 363-8653

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