Osisko Development Announces Optimized Feasibility Study for Permitted Cariboo Gold Project with C$943 Million After-Tax NPV5% and 22.1% IRR at US$2,400/oz Base Case Gold Price; at US$3,300/oz Spot Gold C$2.1 Billion After-Tax NPV5% and 38.0% IRR

(All dollar amounts are expressed in CAD dollars, unless stated otherwise)

HIGHLIGHTS¹

MONTREAL, Québec, April 28, 2025 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") is pleased to announce the results of a positive optimized Feasibility Study ("2025 FS") for its permitted, 100%-owned Cariboo Gold Project ("Cariboo Gold" or the "Project"), located in central British Columbia ("BC"), Canada. The 2025 FS was completed by BBA Engineering Ltd. ("BBA") as lead independent consultant, and supported by other independent engineering firms, in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects ("NI 43-101"). The Company intends to file the technical report in respect of the 2025 FS (the "Technical Report") on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov) under Osisko Development's issuer profile within 45 days of the date of this news release. The 2025 FS confirms strong economics for a low-impact underground operation using mechanized bulk mining methods, with attractive operating costs, manageable capital requirements, and well-positioned to benefit from favorable macroeconomic and gold price trends. The process facilities have been designed to accommodate potential future throughput expansions.

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