MONTRÉAL, QUÉBEC–(Marketwired – Sept. 27, 2016) –

NOT FOR DISTRIBUTION TO UNITED STATES NEWSWIRE SERVICES OR FOR DISSEMINATION IN THE UNITED STATES

Osisko Mining Inc. (TSX:OSK) (“Osisko” or the “Corporation“) is pleased to announce, further to its press release dated September 9, 2016, that the Corporation has completed a “bought deal” private placement financing of 11,750,000 common shares of the Corporation (“Common Shares“) at a price of $2.75 per Common Share for total gross proceeds of $32,312,500 (the “Offering“). The Offering includes the issuance by the Corporation of 1,750,000 Common Shares pursuant to the exercise in full of the option granted to the underwriters. The Offering was underwritten by a syndicate of underwriters led by BMO Capital Markets.

The Corporation intends to use the net proceeds of the offering to continue exploration and development of the Windfall Lake gold project and for general corporate purposes.

The Common Shares issued under the Offering are subject to a four-month hold period from the date of issuance of the Common Shares under applicable Canadian securities laws, in addition to such other restrictions as may apply under applicable securities laws of jurisdictions outside Canada. The listing of the Common Shares remains subject to the final listing approval of the Toronto Stock Exchange.

The securities offered will not be and have not been registered under the U.S. Securities Act of 1933, as amended, and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of the securities in any State in which such offer, solicitation or sale would be unlawful.

About Osisko Mining Inc.

Osisko is a mineral exploration company focused on the acquisition, exploration, and development of precious metal resource properties in Canada. Osisko holds a 100% interest in the high-grade Windfall Lake gold deposit located between Val-d’Or and Chibougamau in Québec and holds a 100% undivided interest in a large area of claims in the surrounding Urban Barry area (82,400 hectares), a 100% interest in the Marban project located in the heart of Québec’s prolific Abitibi gold mining district, and properties in the Larder Lake Mining Division in northeast Ontario, including the Jonpol and Garrcon deposits on the Garrison property, the Buffonta past producing mine and the Gold Pike mine property. The Corporation also holds interests and options in a number of additional properties in northern Ontario. Osisko continues to be well financed and has approximately $80 million in cash and cash equivalents (after giving effect to the Offering) as well as marketable securities of approximately $55 million.

Cautionary Note Regarding Forward-Looking Information

This news release contains “forward-looking information” within the meaning of the applicable Canadian securities legislation that is based on expectations, estimates and projections as at the date of this news release. The information in this news release about the completion of the Offering, the timing and ability of the Corporation to complete the formal documentation and obtain the final approvals required to complete the Offering, the intended use by the Corporation of the gross proceeds of the Offering, and any other information herein that is not a historical fact may be “forward looking information”. Any statement that involves discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “anticipates” or “does not anticipate”, “plans”, “budget”, “scheduled”, “forecasts”, “estimates”, “believes” or “intends” or variations of such words and phrases or stating that certain actions, events or results “may” or “could”, “would”, “might” or “will” be taken to occur or be achieved) are not statements of historical fact and may be forward-looking information and are intended to identify forward-looking information.

This forward-looking information is based on reasonable assumptions and estimates of management of Osisko, at the time it was made, involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of Osisko to be materially different from any future results, performance or achievements expressed or implied by such forward-looking information. Such factors include, among others, risks relating to the completion of the Offering; the timing and ability of the Corporation to complete the formal documentation and obtain the final approvals required to complete the Offering; the intended use by the Corporation of the gross proceeds of the Offering; risks relating to property interests; the global economic climate; metal prices; dilution; ability of Osisko to complete further acquisitions; environmental risks; and community and non-governmental actions. Although the forward-looking information contained in this news release is based upon what management believes, or believed at the time, to be reasonable assumptions, Osisko cannot assure shareholders and prospective purchasers that actual results will be consistent with such forward-looking information, as there may be other factors that cause results not to be as anticipated, estimated or intended, and neither Osisko nor any other person assumes responsibility for the accuracy and completeness of any such forward-looking information. Osisko does not undertake, and assumes no obligation, to update or revise any such forward-looking statements or forward-looking information contained herein to reflect new events or circumstances, except as may be required by law.