Osisko Mining Corporate Update

TORONTO, July 18, 2023 (GLOBE NEWSWIRE) -- Osisko Mining Inc. (OSK:TSX. "Osisko" or the "Corporation") is pleased to provide the following corporate update.

Wildfire Situation in Eeyou Istchee James Bay

On July 17, Québec's Ministry of Natural Resources and Forests lifted the access restriction to forests and roads on Crown land in the Eeyou Istchee James Bay area surrounding the Windfall site. To help and support provincial fire-fighting efforts, Windfall camp is lodging over 100 firefighters from the Québec fire-fighting agency, Société de Protection des Forêts Contre le Feu (SOPFEU), who are using the Corporation's facilities as a base to fight regional fires. Windfall will resume underground drilling activities later this week, and increase all other regular site activities back to normal levels as the local fire situation continues to improve in the coming weeks.

John Burzynski, Chairman and Chief Executive Officer, commented: "The Windfall team has done a fantastic job during the past six weeks – a difficult and challenging period, working hand-in-hand and maintaining constant communications with local and provincial authorities to coordinate efforts. Their combined efforts helped maintain the Windfall site infrastructure intact. We were very fortunate that the forest fires passed within the immediate vicinity of the camp facilities several times, but did not cause any material damage to Windfall. Our thoughts and those of our joint-venture partner Gold Fields remain with those local community members and neighbors who were displaced, and those who lost their hunting and fishing cabins in the past month."

Sustainable Development Report

The Corporation published its 2022 Sustainable Development Report on July 18, 2023, which provides a detailed overview of the environmental, social, and governance performance (ESG) and economic contributions in the communities in which we operate. The report is available on the Osisko website (www.osiskomining.com) in English and French.

Sustainability is anchored in Osisko's business strategy through the Health and Safety, Human Resources, Environmental, Community Relations, Human Rights and Responsible Procurement policies. In 2022, Osisko Mining achieved several milestones and made significant organizational progress. In addition, Osisko has strengthened its support for renewable energies through its agreement with Miyuu Kaa for the transmission of hydroelectric power to the Windfall site. The 2022 Sustainable Development Report covers Osisko's activities on our Windfall, Quévillon, and Urban Barry projects. It describes our ESG performance from January 1 to December 31, 2022, and provides comparative data from previous years.