Wesdome’s operations and exploration activities take place in areas of high biodiversity, and we recognize that our activities, if not managed properly, can have negative impacts on biodiversity and future land use. We employ the mitigation hierarchy—avoid, minimize, restore, and offset—to systematically reduce and manage potential biodiversity risks and impacts throughout the project lifecycle. Both Eagle River and Kiena are located within or adjacent to areas with protected conservation status and/or endangered species habitat. All of our proved and probable reserves (100%) are in or near such areas.
Our Biodiversity & Conservation Management Standard outlines our biodiversity assessment and conservation efforts, which are also informed by our Sustainability and Environmental policies. Details on our biodiversity management measures are provided on our website.
In 2025, we developed a new Wildlife Response Procedure at Eagle River, and all significant wildlife observations (moose, bears etc.) are required to be reported to the Environment team. At Kiena, we began implementation of a site-specific Biodiversity and Conservation Management Plan, which was developed in 2024 and is aligned with Level A requirements of TSM’s Biodiversity Conservation Management Protocol.
During the reporting period, we did not experience any environmental incidents that could result in biodiversity impacts, or any significant wildlife-related incidents
Annual Performance Summary
Biodiversity
Prior to starting any work in undisturbed areas, we conduct baseline studies and impact assessments to identify biodiversity risks, and we plan and design mitigation measures. Both Eagle River and Kiena have Environmental Effects Monitoring programs that assess real and potential impacts on fish and aquatic habitats throughout the life of the mine.
In 2025, both sites monitored their activities to comply with biodiversity-related site standards, Company policies, and regulatory requirements. We have strict no littering and no feeding of wildlife policies at both sites, and we store food waste in fully sealed waste containers to prevent wildlife access.
At Eagle River, we delivered educational training for employees on preventing the attraction of bears and wolves to the site. In addition, we implemented several improvements to better manage wildlife interactions, including setting up camp buffers, installing bear bins, and removing vegetation that might attract animals.
In 2025, Kiena began participating in a regional Biodiversity Committee, a multistakeholder group that includes other mining companies and the provincial parks board, and seeks to develop common projects that will promote biodiversity and reduce impacts in the region.
Mine Closure and Land Use Management
In both Ontario and Québec, closure plans are implemented that outline the steps and costs required to safely shut down operations and rehabilitate a site. Closure plans must be approved by regulatory authorities before mining can commence.
Eagle River has individual closure plans for the Mill (which includes the site’s TMA), the underground mine, the formerly-operating Magnacon mine, and the previously operating Mishi open pit. These plans are approved and filed with Ontario’s Ministry of Mines, with financial assurance in place in the form of bonds to cover estimated closure costs. In 2025, Eagle River advanced its mine closure amendment process for the underground mine, receiving approval from the Ministry of Mines to submit its amended closure plan for filing—an important milestone in a process that began in 2019. As part of this, Eagle River began consulting with Indigenous groups to determine how they would like to be involved in the underground mine closure plan amendment process. This work will continue in 2026.
Kiena has a single closure plan, which was approved by Québec’s Department of Energy and Natural Resources in November 2024. Kiena updated the closure bond associated with the plan in November 2025.
While we undertake progressive reclamation where possible at both sites in advance of mine closure, we did not conduct any progressive reclamation activities in 2025.
ZERO
significant wildlife-related events in 2025
Performance
Indicators:
SASB: EM-MM-160a.1 (partial), EM-MM-160a.3
GRI: 2-4, 3-3, 101-1 (partial), 101-2
