Osisko Gold Group Inc.

Osisko Gold Group Inc. has completed its previously announced offering of US$600 million aggregate principal amount of 9.250% senior secured notes due 2031. The notes mature on October 1, 2031, are non-callable for the first two years, and pay interest semi-annually in arrears on April 1 and October 1, beginning April 1, 2027. Net proceeds were approximately US$578.0 million after deducting initial purchasers' discounts and commissions and estimated offering expenses, with the initial purchasers buying the notes at 98.25% of principal. Of that net proceeds total, approximately US$120.8 million was used to repay all amounts outstanding and terminate all commitments under the company's senior secured credit facility with Appian Capital Advisory Limited, while the remainder funded a segregated interest reserve account covering the first five interest payments on the notes and a segregated disbursement account to advance the Cariboo Gold Project. The notes are fully and unconditionally guaranteed by certain subsidiaries, including Barkerville Gold Mines Ltd., which holds the Cariboo Gold Project in British Columbia, and are secured by a first priority lien on the company's and each guarantor's property. Chairman and CEO Sean Roosen said the offering, alongside other available capital, fully funds the company through commercial production anticipated in 2029.

Osisko Gold Group Inc. has entered into an amended and restated credit agreement with funds advised by Appian Capital Advisory Limited for its US$450 million senior secured project loan credit facility. The amendment provides more favourable covenants, reduces the overall cost of capital, and extends the option to settle accrued interest in kind for an additional 12 months. Appian has confirmed satisfaction of key technical conditions precedent to the US$350 million second draw under the facility, including those related to the Lowhee Zone infill drilling and ore sorting programs, and these conditions have been removed. The second draw remains subject to certain remaining conditions precedent associated with ongoing construction readiness activities. Interest rate margins were reduced to SOFR plus 9.00% per annum for the initial draw and SOFR plus 7.25% per annum for the second draw and thereafter.

Osisko Gold Group Inc. announced initial drilling results from the Proserpine regional exploration target on its Cariboo Gold Project property, confirming an emerging gold mineralized system with potential for open pit mining. The results come from 6,463 meters of drilling across 14 holes, with highlight intercepts including 95.93 grams per tonne gold over 4.60 meters at 71 meters vertical depth, including 873.00 grams per tonne gold over 0.50 meters, and 5.46 grams per tonne gold over 8.60 meters at 77 meters vertical depth. The Proserpine target is located approximately 7 kilometers southeast of the permitted, 100%-owned Cariboo Gold deposit, and drilling has expanded the known mineralized footprint to about 1.0 kilometer by 0.5 kilometer within a larger 6.0 kilometer by 1.0 kilometer gold-in-soil and rock anomaly. Mineralization remains open in all directions, and an additional 26,500 meters of drilling is planned, with three rigs resuming work after a seasonal hiatus.

Osisko Gold Group has entered into a Support and Benefits Agreement with the District of Wells, British Columbia, effective July 21, 2026, to support social and economic initiatives tied to its fully permitted Cariboo Gold Project. The three-year agreement contemplates voluntary financial contributions by the company of up to $3.0 million in aggregate, subject to its sole discretion and continued participation. Priorities include $500,000 in targeted capital and operating support for the WILDways High School to address infrastructure needs and enable local high school attendance. The agreement establishes a framework for ongoing collaboration as the project advances toward construction.

Osisko Development announced new drilling results from its Cariboo Gold Project in British Columbia, extending high-grade gold mineralization beyond 700 metres vertical depth in previously untested areas. The eleven surface diamond drill holes, totaling 8,971 metres, intercepted mineralization in all holes, with approximately 65% of drilling transecting areas outside the current mineral resource footprint. Highlight intercepts from outside the resource include 13.19 grams per tonne gold over 3.60 metres at 596 metres vertical depth and 28.90 grams per tonne gold over 0.50 metres at 718 metres vertical depth. The results confirm the presence of high-grade mineralization at depth and reinforce the strong potential for resource growth upside well beyond the current deposit's average depth of approximately 350 metres. Five drill rigs continue systematic testing of targets down-dip of the current resource to a maximum vertical depth of up to 800 metres.