Osisko Development Secures US$450 Million Financing Facility to Develop the Cariboo Gold Project

HIGHLIGHTS

US$450 million project loan facility secured from new strategic partner Appian Capital Advisory to fund the development and construction of the Cariboo Gold Project in B.C., Canada

US$100 million initial draw enables the Company to accelerate project pre-construction activities and materially de-risk the Project

US$350 million in subsequent draws available on a final investment decision subject to certain customary project milestones and conditions precedent

Strong endorsement and cornerstone financing commitment from a leading investment fund, exclusively dedicated to long-term value in the mining space

Initial draw to support an infill drilling campaign, certain detailed engineering, procurement, underground development, operational readiness planning, and other early works activities

Enhances financial flexibility with the planned repayment of its outstanding US$25 million term loan with National Bank, as it advances toward fully funding the construction of Cariboo

MONTREAL, July 21, 2025 (GLOBE NEWSWIRE) -- Osisko Development Corp. (NYSE:ODV, TSXV:ODV) ("Osisko Development" or the "Company") is pleased to announce that it has entered into a credit agreement with funds advised by Appian Capital Advisory Limited ("Appian") with respect to a senior secured project loan credit facility (the "Credit Facility") totaling US$450 million for the development and construction of its permitted, 100%-owned Cariboo Gold Project ("Cariboo" or the "Project"), located in central British Columbia ("B.C."), Canada.

The Credit Facility provides strategic capital and enhanced financial flexibility as the Company advances Cariboo through the next phase of pre-construction and early works milestones toward construction readiness. It is structured in two tranches aligned with the Project's planned development timeline. An initial draw of US$100 million (the "Initial Draw") was completed and will be used to: (i) undertake a 13,000-meter infill drill campaign to further de-risk Project mine planning assumptions; (ii) fund pre-construction and construction activities for the development of Cariboo; (iii) repay the Company's existing outstanding US$25 million term loan with National Bank of Canada, maturing in October 2025; and (iv) support the Project's general working capital requirements.

"We are delighted to welcome Appian as a new cornerstone investor, which is a significant endorsement of the Cariboo Gold Project and a major milestone in advancing it towards a construction decision," commented Sean Roosen, Chairman and CEO. "Having recently completed an updated feasibility study for the Project, the US$450 million facility represents a key financing commitment and allows us to maintain momentum towards a formal investment decision. The facility is structured to provide us with financial flexibility as we continue to push forward on pre-construction and construction activities and seek to fully fund the Project for construction. Appian is the leading investor in the mining space and has a successful track record of identifying and supporting the development of high-quality assets into production—we are encouraged by their confidence in our team and vision to develop the next major Canadian gold mine."

Michael W. Scherb, Founder and CEO of Appian, commented, "The Cariboo Gold Project perfectly aligns with Appian's disciplined, technically driven investment strategy. It is situated in a stable jurisdiction, boasts a robust existing minerals base with clear upside potential, and is being led by an experienced management team. The project also holds permits that will enable near-term progress to production. This transaction showcases the strength of Appian's dedicated credit and royalties offering, including the added value that our market-leading technical team can provide project owners. We look forward to working constructively with the Osisko team to help advance the project."

CREDIT FACILITY TERMS, US$450 MILLION

Credit Limit: US$450 million senior secured credit facility, through the Company's wholly-owned subsidiary, Barkerville Gold Mines Ltd. ("Barkerville").

Initial Draw: US$100 million drawn at closing (July 21, 2025).

Subsequent Draws: US$350 million to be drawn in up to four subsequent tranches, will be available for a period of up to 36 months after the close of the Initial Draw subject to the satisfaction of certain project milestones and customary conditions (the "Subsequent Draws"), with each advance in the minimum amount of at least US$50 million.

Term and Maturity: The Credit Facility matures on July 21, 2033 or 8.0 years from closing. If the Company does not elect to make any Subsequent Draws, the Credit Facility will mature on July 21, 2028 or 3.0 years from closing in respect of the Initial Draw.

Interest Rate: