Osisko Development Files Close-Out Early Warning Report - Seite 2

This press release is being issued in accordance with National Instrument 62-103 – The Early Warning System and Related Take-Over Bid and Insider Reporting Issues in connection with the filing of an early warning report dated July 5, 2023. The early warning report respecting the Transactions has been filed on SEDAR (www.sedar.com) under Cornish Metals' issuer profile. To obtain a copy of the early warning report filed by the Osisko Development, please contact Sean Roosen at [phone] or refer to SEDAR (www.sedar.com) under Cornish Metals' issuer profile.

The Company's head office is located at 1100 Avenue des Canadiens-de-Montréal, Suite 300, Montréal, Québec, Canada, H3B 2S2. The early warning disclosure in this press release, and the early warning report filing in connection with the Transactions, was filed late due to administrative error.

About Osisko Development Corp.

Osisko Development Corp. is a premier North American gold development company focused on high-quality past-producing properties located in mining friendly jurisdictions with district scale potential. The Company's objective is to become an intermediate gold producer by advancing its 100%-owned Cariboo Gold Project, located in central B.C., Canada, the Tintic Project in the historic East Tintic mining district in Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico. In addition to considerable brownfield exploration potential of these properties, that benefit from significant historical mining data, existing infrastructure and access to skilled labour, the Company's project pipeline is complemented by other prospective exploration properties. The Company's strategy is to develop attractive, long-life, socially and environmentally sustainable mining assets, while minimizing exposure to development risk and growing mineral resources.

For further information, please contact Osisko Development Corp.:

Sean Roosen	Philip Rabenok
Chairman and CEO	Director, Investor Relations
Email: [e-mail]	Email: [e-mail]
Tel: [phone]	Tel: [phone]

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this press release. No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein.