Osisko commences legal proceeding to restrain misuse of confidential information by Goldcorp

(Montréal, QC, January 29, 2014) — Osisko Mining Corporation (Osisko or the Company) (TSX: OSK; Deutsche Boerse: EWX) today announced that it has commenced a legal proceeding against Goldcorp Inc. (Goldcorp) in the Québec Superior Court.

In the Quebec proceeding, Osisko alleges that, in making its hostile take-over bid for Osisko dated January 14, 2014 (the Hostile Bid), Goldcorp misused confidential information and otherwise acted in a manner not permitted by the confidentiality agreement between the parties (the Confidentiality Agreement). Osisko also alleges that Goldcorp acted in bad faith and in a manner contrary to applicable law, in actions taken by Goldcorp prior to launching its Hostile Bid. Accordingly, Osisko is seeking an order enjoining the Hostile Bid and further conduct by Goldcorp that Osisko alleges is in breach of the Confidentiality Agreement.

Osisko believes that the Hostile Bid is opportunistic and financially inadequate and threatens to deprive Osiskos shareholders of adequate consideration for their shares without providing the Companys Board of Directors with a sufficient opportunity to properly convey the value of Osiskos world-class assets or to develop, review and evaluate all value-enhancing alternatives.

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 in Ontario and Mexico.

Forward-Looking Statements

Certain statements contained in this press release may be deemed forward-looking statements. All statements in this release, other than statements of historical fact, that address events or developments that Osisko expects to occur, are forward looking statements. Forward looking statements are statements that are not historical facts and are generally, but not always, identified by the words expects, plans, anticipates, alleges, believes, intends, estimates, projects, potential, scheduled and similar expressions, or that events or conditions will, would, may, could or should occur including, without limitation, the value of the assets of Osisko and Goldcorp, the price of gold and other metals, competitive conditions in the mining industry, general economic conditions, changes in laws, rules and regulations applicable to Osisko and Goldcorp, whether or not Osiskos Québec proceeding against Goldcorp will be successful and whether or not any alternative transaction superior to the Hostile Bid may emerge. Although Osisko believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, including, without limitation, that all technical, economical and financial conditions will be met in order to achieve such events qualified by the foregoing cautionary note regarding forward looking statements, such statements are not guarantees of future performance and actual results may differ materially from those in forward looking statements. Factors that could cause the actual results to differ materially from those in forward-looking statements include uncertainty in the outcome of legal proceedings, gold prices, access to skilled consultants, mining development and construction personnel, results of exploration and development activities, Osiskos limited experience with production and mining operations, uninsured risks, regulatory framework and changes, defects in title, availability of personnel, materials and equipment, timeliness of government approvals, actual performance of facilities, equipment and processes relative to specifications and expectations, unanticipated environmental impacts on operations market prices, continued availability of capital and financing and general economic, market or business conditions, the availability of alternative transactions. Many of these factors are discussed in greater detail in Osiskos most recent Annual Information Form and in the most recent Management Discussion and Analysis filed on SEDAR, which also provide additional general assumptions in connection with these statements. Osisko cautions that the foregoing list of important factors is not exhaustive. Investors and others who base themselves on forward-looking statements should carefully consider the above factors as well as the uncertainties they represent and the risk they entail. Osisko believes that the expectations reflected in those forward-looking statements are reasonable, but no assurance can be given that these expectations will prove to be correct and such forward-looking statements included in this press release should not be unduly relied upon. These statements speak only as of the date of this press release.

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