Osisko Mining Corp.

MONTREAL, QUEBEC -- (Marketwire) -- 08/10/10 -- Osisko Mining Corporation (the 'Company' and 'Osisko') (TSX: OSK)(FRANKFURT: EWX) is pleased to report its second quarter financial results for the period ended June 30, 2010.

Highlights

--  Acquisition of 77% interest in Brett Resources Inc. and its Hammond
    Reef Project;

--  Continued progress on the construction and development of the Canadian
    Malartic

Please note that a map is available with this press release.

MONTREAL, QUEBEC -- (Marketwire) -- 08/09/10 -- Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) and Brett Resources Inc. ('Brett') (TSX VENTURE: BBR) are pleased to announce results from the ongoing drilling program at Hammond Reef, located in western Ontario. The Hammond Reef project is 100 percent owned by Brett, which is currently 77.2

MONTREAL, QUEBEC -- (Marketwire) -- 08/09/10 -- Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) and Brett Resources Inc. ('Brett') (TSX VENTURE: BBR) are pleased to announce results from the ongoing drilling program at Hammond Reef, located in western Ontario. The Hammond Reef project is 100 percent owned by Brett, which is currently 77.2% held by Osisko and being fully acquired by Osisko as a

MONTREAL, QUEBEC -- (Marketwire) -- 08/05/10 -- Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) and Clifton Star Resources Inc ('Clifton') (TSX: CFO)(FRANKFURT: C3T) are pleased to announce results from twenty-six additional holes from the 2010 drill program at the Duparquet Project, located in the Abitibi region of Quebec. Drilling is focused on three properties: Beattie, Donchester (eastern

MONTREAL, QUEBEC -- (Marketwire) -- 07/15/10 -- Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) is pleased to announce initial results from the 2009-2010 definition drill program on the Western Porphyry Zone, located on Osisko's 100%-owned Amphi property immediately adjacent to the Canadian Malartic property, and approximately 1.8 km northwest of the crusher and the 55,000-tpd mill currently being

MONTREAL, QUEBEC -- (Marketwire) -- 07/13/10 -- Osisko Mining Corporation ('Osisko') (TSX: OSK) (FRANKFURT: EWX) and Brett Resources Inc. ('Brett') (TSX VENTURE: BBR) (FRANKFURT: A4N) are pleased to announce that they have commenced the necessary steps to allow Osisko to acquire all of the remaining common shares of Brett that it does not currently hold. In order for Brett to become a wholly-owned subsidiary of

MONTREAL, QUEBEC -- (Marketwire) -- 07/02/10 -- Osisko Mining Corporation ('Osisko')(TSX: OSK)(FRANKFURT: EWX) and Clifton Star Resources Inc ('Clifton(TSX VENTURE: CFO)(FRANKFURT: C3T) are pleased to announce results from twenty-nine additional holes from the 2010 drill program and extended core sampling program at the Duparquet Project, located in the Abitibi region of Quebec. Drilling and extended sampling on