Osisko Commences Drill Program At Osborne-Bell

(Toronto, December 14, 2017)  Osisko Mining Inc. (OSK:TSX. “Osisko” or the “Corporation”) is pleased to announce it has commenced drilling with two drill rigs on its 100% owned Osborne-Bell gold deposit located in the Abitibi greenstone belt, Quévillon Township, Eeyou Istchee James Bay Region, Québec. Located 17 kilometres northwest of the town of Lebel-sur-Quévillon and 112 kilometres west of the Windfall Lake gold deposit, Osborne-Bell is part of Osiskos Quévillon Project, which consists of a 2160 square kilometer land package hosting approximately thirty known gold showings.  A map showing the location of the deposit and project is posted on our website at www.osiskomining.com.

The 50,000 metre drill program will re-evaluate the historical Osborne-Bell resource, and test regional exploration targets on the Quévillon Project.  The Osborne-Bell deposit has seen significant historical drilling, which Osisko intends to re-log as part of the ongoing program.

The Company is also currently completing a 27,000 kilometre high-definition magnetic survey and 5,400 kilometre V-TEM airborne survey over the Quévillon Project.

Qualified Person
The scientific and technical content of this news release has been reviewed, prepared and approved by Mr. Mathieu Savard, B.Sc., P.Geo. (OGQ 510), Vice President Exploration – Québec, who is a “qualified person” as defined by National Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”).

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, projections and interpretations as at the date of this news release. The information in this news release about the Osborne-Bell gold deposit and Quévillon project; the current 50,000 metres drill program; the significance of results from the ongoing drill program at the Quévillon project; the significance of the thirty known gold showings, if any; the significance of the high-definition magnetic survey and V-TEM airborne survey over the Quévillon Project, if any; the type of drilling included in the drill program; potential mineralization; the ability to realize upon any mineralization in a manner that is economic; the ability to complete any proposed exploration activities and the results of such activities; 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, interpretations, beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”, or “does not expect”, “is expected”, “interpreted”, “managements view”, “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 the Corporation at the time it was made. This 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 ability of exploration activities (including drill results, high-definition magnetic surveys and V-TEM airborne surveys) to accurately predict mineralization; errors in managements geological modelling; the ability of Osisko to complete further exploration activities, including drilling; property interests in the Osborne-Bell gold deposit and Windfall Lake gold project; the results of exploration activities; risks relating to mining activities; the global economic climate; metal prices; dilution; 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 of securities of the Corporation 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.

For further information please contact:
John Burzynski. President and Chief Executive Officer
Telephone: (416) 363-8653