Osisko Development Files NI 43-101 Feasibility Study Technical Report for the Cariboo Gold Project

Rhea-AI Summary

Osisko Development (NYSE: ODV, TSXV: ODV) has filed a new NI 43-101 Technical Report for its 100%-owned Cariboo Gold Project in British Columbia. The 2025 Feasibility Study reveals impressive economic metrics with an after-tax NPV5% of C$943 Million and 22.1% IRR at a base case gold price of US$2,400/oz. At the current spot gold price of US$3,300/oz, the project shows even stronger potential with C$2.1 Billion after-tax NPV5% and 38.0% IRR. The Technical Report, effective April 25, 2025, was prepared by multiple independent engineering firms and supersedes the previous January 2023 report. The fully permitted project demonstrates robust economics and significant upside potential at higher gold prices.

Positive

• Strong project economics with C$943 Million after-tax NPV5% and 22.1% IRR at base case
• Significant upside potential with C$2.1 Billion NPV5% and 38.0% IRR at spot gold price
• Project is already fully permitted
• 100% ownership of the project by Osisko Development

Negative

• None.

Insights

Mining Engineer & Economic Geologist

Cariboo Gold Project feasibility study shows robust economics with C$943M NPV and 22.1% IRR at US$2,400/oz gold.

Osisko Development's newly filed NI 43-101 technical report for their Cariboo Gold Project represents a significant milestone for the company. This 2025 Feasibility Study substantially improves upon the previous 2023 assessment, demonstrating compelling project economics that should attract investor attention.

The report's headline figures are impressive, showing an after-tax NPV5% of C$943 million and IRR of 22.1% at the base case gold price of US$2,400/oz. Even more striking is the upside sensitivity at current spot prices around US$3,300/oz, which yields an after-tax NPV5% of C$2.1 billion and IRR of 38.0%.

This represents an exceptional improvement over the superseded 2023 technical report. The optimized feasibility study likely incorporates enhanced mine planning, potential cost reductions, and higher gold price assumptions that collectively strengthen the project's financial metrics.

The fact that this project is already fully permitted is particularly valuable, eliminating a significant development risk that often delays mining projects. This places Cariboo on a faster track to potential production compared to many competing gold development projects in North America.

The comprehensive nature of the technical report, prepared by multiple independent qualified engineering firms, provides a high degree of credibility to these projections. For a junior mining company like Osisko Development, having a flagship asset with a multi-billion dollar NPV (at current gold prices) represents a transformational opportunity that could redefine the company's market position.

MONTREAL, June 11, 2025 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE: ODV, TSXV: ODV) ("Osisko Development" or the "Company") announces the filing of a technical report (the "Technical Report") prepared in accordance with National Instrument 43-101 – Standards of Disclosure for Mineral Projects ("NI 43-101") in respect of the feasibility study ("2025 FS") for its permitted, 100%-owned Cariboo Gold Project (the "Cariboo Gold Project"), located in central British Columbia, Canada.

The Technical Report, titled "NI 43-101 Technical Report, Feasibility Study for the Cariboo Gold Project, District of Wells, British Columbia, Canada" and dated June 11, 2025 (with an effective date of April 25, 2025), was prepared in accordance with NI 43-101 by independent representatives of BBA Engineering Ltd., as lead independent consultant, and supported by other independent engineering firms, including InnovExplo Inc., Alius Mine Consulting Ltd., Falkirk Environmental Consultants Ltd., WSP Canada Inc., M.A. O'Kane Consultants Inc., Integrated Sustainability Consultants Ltd., Clean Energy Consulting Inc., and JDS Energy & Mining Inc., each of whom is a "qualified person" (within the meaning of NI 43-101) and independent of Osisko Development (within the meaning of Section 1.5 of NI 43-101).

The Technical Report supports the disclosure made by the Company in its news release dated April 28, 2025 (titled "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") announcing the results of the 2025 FS.

The Technical Report supersedes the technical report titled "NI 43-101 Technical Report, Feasibility Study for the Cariboo Gold Project, District of Wells, British Columbia" (as amended) dated January 12, 2023 (with an effective date of December 30, 2022), which should no longer be replied upon.

The Technical Report is intended to be read as a whole, and sections should not be read or relied upon out of context. Reference should be made to the full text of the Technical Report, including all assumptions, qualifications and limitations therein, which is available electronically on SEDAR+ (www.sedarplus.ca) and on EDGAR (www.sec.gov) under Osisko Development's issuer profile and on the Company's website at https://osiskodev.com/projects/cariboo-gold.

ABOUT OSISKO DEVELOPMENT CORP.

Osisko Development Corp. is a continental 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 flagship permitted 100%-owned Cariboo Gold Project, located in central B.C., Canada. Its project pipeline is complemented by the Tintic Project in the historic East Tintic mining district in Utah, U.S.A., and the San Antonio Gold Project in Sonora, Mexico—brownfield properties with significant exploration potential, extensive historical mining data, access to existing infrastructure and skilled labour. The Company's strategy is to develop attractive, long-life, socially and environmentally responsible 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	Vice President, Investor Relations
Email: sroosen@osiskodev.com	Email: prabenok@osiskodev.com
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.

FAQ

What is the after-tax NPV and IRR of ODV's Cariboo Gold Project at US$2,400/oz gold?

At the base case gold price of US$2,400/oz, the Cariboo Gold Project has an after-tax NPV5% of C$943 Million and an IRR of 22.1%.

What is the potential value of ODV's Cariboo Gold Project at US$3,300/oz gold price?

At US$3,300/oz gold price, the Cariboo Gold Project shows an after-tax NPV5% of C$2.1 Billion and an IRR of 38.0%.

Where is ODV's Cariboo Gold Project located?

The Cariboo Gold Project is located in central British Columbia, Canada.

Is ODV's Cariboo Gold Project fully permitted?

Yes, the Cariboo Gold Project is fully permitted and 100% owned by Osisko Development.

When was the new Technical Report for ODV's Cariboo Project effective?

The new Technical Report has an effective date of April 25, 2025, and was filed on June 11, 2025.