Osisko Mining Corp.

Val-d'Or, Quebec - May 4, 2011 - NioGold Mining Corporation (TSX-V:NOX) ("NioGold" or the "Company") is pleased to report on the on-going exploration drilling program within the southern portion of Company's wholly-owned Malartic Block property, located in the Malartic gold camp, Abitibi region of Quebec.

Gold Production Forecast at 1.02M ounces over next 18 months

MONTREAL, QUEBEC -- (Marketwire) -- 04/28/11 -- Osisko Mining Corporation (TSX: OSK)(FRANKFURT: EWX) ('Osisko') is pleased to provide a revised summary of the annual mine production plan for its 100%-owned Canadian Malartic project. This new plan is based on the $US1000 gold reserve estimate of 10.71M ounces gold that was recently disclosed (see March 31, 2011 press release). G Mining Services of Montreal are the independent consultants for Osisko who have authorized the release of the following plan. Highlights include:

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MONTREAL, QUEBEC -- (Marketwire) -- 04/13/11 -- Editors Note: A photo for this release is available via Marketwire's website. Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) is pleased to announce that today it has poured its first gold bar at its flagship Canadian Malartic Mine.

Total reserves up 19 percent

MONTREAL, QUEBEC -- (Marketwire) -- 03/31/11 -- Osisko Mining Corporation (TSX: OSK)(FRANKFURT: EWX) is pleased to provide an updated reserve and resource estimate for its 100%-owned Canadian Malartic project. This new estimate, calculated at US$1000 gold, combines the previously-reported US$825 reserves and resources of the Canadian Malartic (CM) and South Barnat deposits (see February 10 2010 press release) with new resources defined from the ongoing drill program, including the Barnat Extension and Gouldie Zones.

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MONTREAL, QUEBEC -- (Marketwire) -- 03/28/11 -- Osisko Mining Corporation ('Osisko')(TSX: OSK)(FRANKFURT: EWX) is pleased to report that it has exercised its buy out option to purchase 50% of the net smelter royalty held over certain claims included in the Canadian Malartic property for US$1.5 million.

MONTREAL, QUEBEC -- (Marketwire) -- 02/28/11 -- Osisko Mining Corporation (the 'Company' or 'Osisko') (TSX: OSK)(FRANKFURT: EWX) is pleased to report its review of activities and financial results for the year ended December 31, 2010. Highlights

MONTREAL, QUEBEC -- (Marketwire) -- 02/28/11 -- Osisko Mining Corporation ('Osisko') (TSX: OSK)(FRANKFURT: EWX) and Golden Valley Mines Ltd. (TSX VENTURE: GZZ) are pleased to announce additional results from the 2010 drill program targeting the Jeffrey Zone on the Malartic CHL Property, currently under option from Abitibi Royalties Inc., a

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MONTREAL, QUEBEC -- (Marketwire) -- 02/24/11 -- Osisko Mining Corporation ('Osisko'), (TSX: OSK)(FRANKFURT: EWX) is pleased to announce initial results from the fall 2010 drilling program at the Hammond Reef gold project, located near Atikokan in western Ontario. The Hammond Reef project is 100 percent owned by Osisko Hammond Reef Gold Ltd., a

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MONTREAL, QUEBEC -- (Marketwire) -- 02/22/11 -- Midland Exploration Inc. ('Midland') (TSX VENTURE: MD), in partnership with Osisko Mining Corporation ('Osisko'), is pleased to announce the resumption of drilling on the Dunn property following the ...

(All Amounts in $US unless stated otherwise) VANCOUVER, Feb. 8 /CNW/ - Goldcorp Inc. (TSX: G, NYSE: GG) today announced that it has sold its 10.1% equity interest in Osisko Mining Corporation ("Osisko"), representing approximately 38.6 million common ...