• Osisko Development appointed Sarah MacDonald as vice president, construction contracting and commercial, effective immediately.
• MacDonald joins from Dumas Contracting, where she served as general counsel supporting underground mining operations across Canada, Mexico, and United States, with focus on construction contracting and complex commercial arrangements.
• She previously practiced corporate and commercial law at a major law firm for more than a decade.
• Appointment strengthens execution capacity as company advances Cariboo Gold Project in British Columbia.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Osisko Development Corp. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001171843-26-002983), on May 04, 2026, and is solely responsible for the information contained therein.