(Montreal, December 16, 2013) — Osisko Mining Corporation (the “Company” or “Osisko”) (OSK:TSX; EWX:Deutsche Boerse) is pleased to announce that it has completed the final agreements with CPPIB Credit Investments Inc. (“CPPIB”), a wholly-owned subsidiary of the CPPIB Investment Board, the Caisse de dépôt et placement du Québec (“CDPQ”) and Ressources Québec (“RQ”), a subsidiary of Investissement Québec, to modify certain terms of its long-term debt facilities.  The final terms, as noted below, remain unchanged from Osisko’s prior announcement of the modified terms (see Osisko press release dated July 30^th, 2013).

Osisko’s repayment schedule of the $150 million CPPIB facility (negotiated in 2009) and the $75 million convertible debentures (also negotiated in 2009) has been modified as per the following schedule:

The 12.5 million warrants held by CPPIB will expire on September 30, 2017, with an exercise price of the warrants of $6.25 (previously $10.00).  The exercise of the warrants may be accelerated at the Company’s option if the Osisko shares trade at a price above $8.15 for 15 consecutive days.  The $100 million delayed drawdown facility established in May 2012 with CPPIB has been terminated as previously agreed.

The convertible debentures held by CDPQ and RQ will now become due in November 2017.  The debentures will be convertible into Osisko shares at any time prior to the due date at the price of $6.25 per share (previously $9.18).

The CPPIB credit facility and the convertible debentures will bear a fixed rate of interest of 6.875%, compared to 7.5% previously.

The amended credit agreements provide greater financial flexibility to Osisko, including:

• Allowing to negotiate letter of credit facilities for up to $55 million;
  
• Allow for the distribution of dividends and share buy-back programs, subject to standard liquidity tests and a minimum gold price of US$1,200 per ounce.

Sean Roosen, President and Chief Executive Officer, commenting on the completion of the renegotiation of long-term debt: “We are pleased with the improved terms and conditions of the amended facilities, and appreciate the confidence that these financial partners have in Osisko as we pursue our goal to become a leading intermediate gold producer”.

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”, “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 timely satisfaction of the conditions of the agreements and the enhancement of the Corporation’s financial flexibility in order to allow the continuous development of the Corporation’s activities. 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 gold prices, access to skilled consultants, mining development and construction personnel, results of exploration and development activities, Osisko’s 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. These factors are discussed in greater detail in Osisko’s 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.