Osisko Gold Announces Proposed US$500 Million Senior Secured Notes Offering to Refinance Appian Project Financing Facility and Advance Cariboo Gold Project

TORONTO, Sept. 21, 2026 (GLOBE NEWSWIRE) -- Osisko Gold Group Inc. (NYSE: OGG, TSXV: OGG) ("Osisko Gold" or the "Company") announces its intention to offer and sell US$500 million aggregate principal amount of senior secured notes due 2031 (the "Notes") to refinance its existing senior secured project loan facility with funds advised by Appian Capital Advisory Limited (the "Appian Credit Facility") and advance the construction of the Cariboo Gold Project in British Columbia, Canada (the "Cariboo Gold Project"), subject to market and other conditions (the "Offering").

The Notes will be fully and unconditionally guaranteed by certain of the Company's subsidiaries, which, at closing, is expected to consist of Barkerville Gold Mines Ltd., the Company's subsidiary relating to the Cariboo Gold Project, and will be secured by a first priority lien on the Company's and each guarantor's property, including equity interests owned by the Company and each guarantor in their respective subsidiaries, the interest reserve account and disbursement account, as described herein, and personal and real property, subject to certain exceptions. The aggregate principal amount, interest rate and other terms of the Notes will be determined at pricing and are dependent upon market conditions and other factors.