Osisko Development Announces Senior Management Update

NYSE | TSXV: ODV NEWS RELEASE

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OSISKO DEVELOPMENT ANNOUNCES SENIOR MANAGEMENT UPDATE

Montreal, Québec, January 9 , 202 5 – Osisko Development Corp. (NYSE: ODV, TSXV: ODV)

("Osisko Development" or the "Company") is pleased to announce the appointment of David Rouleau

as Vice President, Project Development. This appointment aligns with the Company's strategic focus on

building an operations-driven team to advance its flagship 100%-owned Cariboo Gold Project located in

central British Columbia, Canada . The Company also announces that Éric Tremblay, Chief Operating

Officer, is leaving the Company effective immediately to pursue other professional commitments in the

mining sector. In addition to his appointed role, Mr. Rouleau will provide senior leadership support during

the transition period until a permanent COO is appointed and he will take an active role in advancing

operational readiness efforts for the Cariboo Gold Project. The Company has initiated an executive

search process for the COO role, and will provide an update in due course.

"We are excited to welcome Dave to our team , who brings a wealth of operational and leadership

experience over his more than 3 5-year professional career in the mining sector and he will be a vital

asset as we advance activities at Cariboo in 2025 and beyond," commented Sean Roosen, Founder,

Chairman and CEO. "On behalf of management and the board, I would also like to extend our thanks

to Éric for his dedicated service and invaluable contributions to the company during his tenure. We wish

him all the best and every success in his personal and professional endeavours."

Mr. David Rouleau is a seasoned executive with over 35 years of operational and management

experience in the mining industry. His experience spans across projects and operations at various stages

of growth including feasibility studies, environmental assessments, permitting, construction, start -up,

expansion, and continuous improvement settings. Most recently, Mr. Rouleau served as Vice President

of Mine Optimization and Strategic Planning at Victoria Gold, where he oversaw the Brewery Creek

Project and supported business development initiatives in assessing mining and exploration projects .

Earlier, he worked in British Columbia's Cariboo Regional District as Vice President of Operations for

Barkerville Gold Mines (2016-2018) and at Taseko Mines (2010-2016), responsible for the Gibraltar

Mine.

Earlier in his career, Mr. Rouleau was a key member of the Canadian Natural Resources senior

management team developing the Horizon Oil Sands Project in Fort McMurray, Alberta. Additionally, Mr.

Rouleau spent 17 years with Teck Cominco in various operational and engineering roles across multiple

mine sites. Mr. Rouleau holds a BSc in Mine Engineering from the South Dakota School of Mines and a

Mine Technology Diploma from the Haileybury School of Mines.

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ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. is a North American gold development company focused on past -producing

mining camps 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 prop erties, 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, visit our website at www.osiskodev.com or contact:

Sean Roosen Philip Rabenok

Chairman and CEO Director, Investor Relations

Email: [email protected] Email: [email protected]

Tel: +1 (514) 940-0685 Tel: +1 (437) 423-3644

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 news release. No stock exchange,

securities commission or other regulatory authority has approved or disapproved the information contained herein.