Mr. John Burzynski reports

OSISKO MINING ANNOUNCES $68 MILLION "BOUGHT DEAL" PRIVATE PLACEMENT OF FLOW-THROUGH SHARES

Osisko Mining Inc. has entered into an agreement with a syndicate of underwriters led by Canaccord Genuity Corp. and including Haywood Securities Inc., Macquarie Capital Markets Canada Ltd. and National Bank Financial Inc. in connection with a bought deal private placement financing of an aggregate of 26,176,471 common shares of the corporation that will qualify as flow-through shares (within the meaning of Subsection 66(15) of the Income Tax Act (Canada) and, in relation to FT tranche one (as defined herein), Section 359.1 of the Taxation Act (Quebec)).

The flow-through shares will be issued in two tranches:

• Tranche one will consist of 14,035,088 flow-through shares to be issued at a price of $2.85 to residents of Quebec for aggregate gross proceeds of approximately $40-million.
• Tranche two will consist of 12,141,383 flow-through shares to be issued at a price of $2.30 to residents outside of Quebec for aggregate gross proceeds of approximately $28-million.

The gross proceeds from the issue and sale of the flow-through shares will be used by the corporation to incur eligible Canadian exploration expenses that will qualify as flow-through mining expenditures as such terms are defined in the Income Tax Act (Canada) related to the corporation's projects in Quebec on or before Dec. 31, 2019. All qualifying expenditures will be renounced in favour of the subscribers of the flow-through shares, effective Dec. 31, 2018.

The offering is expected to close on or about Sept. 18, 2018, and is subject to certain conditions, including, but not limited to, the receipt of all necessary approvals, including the approval of the Toronto Stock Exchange and the applicable securities regulatory authorities. The flow-through shares to be issued under the offering will be subject to a hold period in Canada expiring four months and one day from the closing date of the offering.

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-per-cent interest in the high-grade Windfall gold deposit located between Val d'Or and Chibougamau in Quebec and holds a 100-per-cent undivided interest in a large area of claims in the surrounding Urban Barry area and nearby Quevillon area (over 3,300 square kilometres), a 100-per-cent interest in the Marban project located in the heart of Quebec's prolific Abitibi gold mining district, and properties in the Larder Lake mining division in Northeastern Ontario, including the Jonpol and Garrcon deposits on the Garrison property. The corporation also holds interests and options in a number of additional properties in Northern Quebec and Ontario.

We seek Safe Harbor.