Osisko Development Corp. announced the appointment of Mr. Stephen Quin, a seasoned mining executive, as independent director to the Company's board of directors effective immediately. Mr. Quin holds a BSc (Honours) in Mining Geology from the Royal School of Mines, London, and brings over 40 years of experience across all stages of the mining industry, from exploration through operations and closure.

Most recently, he spent a decade as President & CEO of Midas Gold Corp. (now Perpetua Resources Corp.) advancing a large-scale gold-antimony project from a maiden mineral resource through completion of a feasibility study. Prior to that, he held senior leadership roles including President & COO of Capstone Mining Corp.

and, before its merger with Capstone, President & CEO of Sherwood Copper Corp. Additionally, he served as Executive Vice President at Miramar Mining Corp. and its copper exploration affiliate, Northern Orion Exploration.

Mr. Quin started his career with what became Imperial Metals Corp., where he was responsible for the advancement of their polymetallic copper-lead-zinc project. Mr. Quin has a combination of technical, governance, and capital markets experience having led more than 30 studies on projects in the copper and gold sectors, ranging from mineral resource estimates and preliminary economic assessments to feasibility studies. He also has extensive experience with permitting, mine financing, development, operations and closure.

From a governance perspective, Mr. Quin has sat on and chaired numerous boards and board committees, and spearheaded governance enhancing initiatives. He has long championed ESG-focused practices, well before the term became widely recognized. On the capital markets front, Mr. Quin played a pivotal role in raising over CAD 1 billion in financing and has been involved in more than CAD 750 million in M&A transactions for companies where he served as CEO or a senior executive.

He currently serves as a non-executive director of Hot Chili Limited and Bravo Mining Corp., as well as the non-executive Chair of TDG Gold Corp.