Mr. Sean Roosen reports

OSISKO GOLD ENTERS SUPPORT AND BENEFITS AGREEMENT WITH THE DISTRICT OF WELLS FOR THE CARIBOO GOLD PROJECT

Osisko Gold Group Inc. has entered into a support and benefits agreement with the District of Wells, B.C., through the company's wholly owned subsidiary, Barkerville Gold Mines Ltd., effective July 21, 2026, to support social and economic initiatives within the district in respect of the company's 100-per-cent-owned, fully permitted Cariboo gold project.

The agreement reinforces the company's commitment to being a responsible and pro-active member of the community as the project advances. It provides for social and economic benefits to the district, reflects the company's commitment to addressing local interests and concerns, and establishes a framework for continuing collaboration as the project advances.

"This agreement reflects a strong and collaborative partnership between the District of Wells and Osisko. As the project moves toward construction, this agreement provides us with critical resources and structure to address community needs and ensure that residents benefit from the opportunities ahead. We look forward to building on this foundation together," said Ed Coleman, mayor of the District of Wells.

"The district and its residents are key partners as we advance the Cariboo gold project. Through this agreement, we remain committed to ensuring that the positive benefits of the project are felt locally and meaningfully. The initiatives supported under this agreement are intended to deliver lasting, positive benefits to the community, and we look forward to continuing to work closely with the district as the project progresses," said Greg Perrins, vice-president, sustainable development, of Osisko Gold.

Over its three-year term, the agreement contemplates voluntary financial contributions by the company of up to $3.0-million in aggregate, subject to the company's sole discretion and continued participation under the agreement. The contributions under the agreement will be advanced in stages over its three-year term to support durable, long-term community infrastructure investments and other priority initiatives identified by the district. Certain agreed-upon priorities include:

• Targeted capital and operating support of $500,000 for the WILDways High School; this funding is intended to support the school's infrastructure needs and continued operation to provide high-school-aged residents of Wells with the opportunity to attend high school in their local community;
• Other community infrastructure initiatives.

The company recognizes that community engagement is a continuing process and remains committed to working collaboratively with the district to address the community's social and economic priorities as the project advances.

About Osisko Gold Group Inc.

Osisko Gold is a continental North American gold development company focused on past-producing mining camps with district-scale potential. The company's objective is to become an intermediate gold producer through the development of its flagship, fully permitted, 100-per-cent-owned Cariboo gold project, located in central British Columbia, Canada. Its project pipeline is complemented by the Tintic project, located in the historic East Tintic mining district in Utah, United States, a brownfield property with significant exploration potential, extensive historical mining data and access to established infrastructure. Osisko Gold is focused on developing long-life mining assets in mining-friendly jurisdictions while maintaining a disciplined approach to capital allocation, development risk management and mineral inventory growth.

We seek Safe Harbor.