Mr. John Burzynski reports

OSISKO FILES TECHNICAL REPORT FOR UPDATED WINDFALL MINERAL RESOURCE ESTIMATE

Osisko Mining Inc. has filed a technical report in accordance with National Instrument 43-101 -- Standards of Disclosure for Mineral Projects to update the mineral resource estimate on its 100-per-cent-owned Windfall gold deposit. The technical report entitled "An updated mineral resource estimate for the Windfall Lake Project, Located in the Abitibi Greenstone Belt, Urban Township, Eeyou Istchee James Bay, Quebec, Canada" and dated April 3, 2020 (effective date of Jan. 3, 2020), has been prepared for Osisko by Micon International Ltd. and BBA Inc. The technical report is available on SEDAR under Osisko's issuer profile.

About Osisko Mining Inc.

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 2,700 square kilometres).