Our Sustainability Journey

Wesdome’s overarching commitment to responsible mining and to managing our potential impacts is put into practice through our efforts to balance environmental stewardship, social well-being, and economic value creation for current and future generations. In line with this commitment, we employ sustainability and ESG frameworks and metrics to measure, manage, and report on the sustainability-related factors that we have identified as most relevant to our business through materiality assessments. This approach enables us to track our progress effectively, manage our risks and demonstrate accountability to our stakeholders and Indigenous partners.

We are continuously working to solidify our foundational ESG and sustainability practices and to identify areas of sustainability performance where we could improve. Our progress is reported each year within our annual ESG reports. In 2025, we focused on developing a Sustainability Strategy that supports our broader corporate strategy and reinforces our commitment to responsible growth, operational excellence, and long-term stakeholder value creation.

We foster a culture of responsibility throughout the organization by incorporating sustainability objectives and targets into our corporate scorecard each year, and sustainability objectives are also included in annual site performance scorecards. Performance against these scorecards informs short-term incentive plans for salaried employees, in addition to employees’ personal performance.

During bi-weekly SLT meetings and company-wide operations meetings, we discuss environmental and social performance and company-wide sustainability priorities, and we consider sustainability-related risks and impacts throughout the full range of our activities, from exploration project planning to the evaluation of major procurement contracts for our operating mines. The Technical, Safety and Sustainability Committee (TSSC) of the Wesdome Board of Directors reviews sustainability performance and progress against annual plans and objectives quarterly.

We continue to benchmark ourselves against industry standards, including the International Council on Mining and Metals (ICMM) Health & Safety guidance and the Global Industry Standard on Tailings Management (GISTM), and we have been working to implement the Mining Association of Canada’s (MAC) Towards Sustainable Mining (TSM) program since 2023. When gaps to industry standards are identified, we develop action plans to address them (for more details, see Responsible Mining Standards).

Sustainability Management System

Wesdome is implementing a comprehensive Sustainability Management System (SMS) that provides a Company-wide framework to integrate environmental stewardship, social performance, and sustainability considerations into governance, operational planning, and decision-making processes. The system standardizes sustainability management across all operations, replacing site-based practices with a consistent, risk-based approach supported by defined roles, documented procedures, and formal oversight.

The SMS enables structured identification and management of environmental and social risks, establishes measurable performance objectives, and supports consistent monitoring and accountability. Through a Plan–Do–Check–Act cycle, it drives continuous improvement while strengthening data quality and transparency for internal management and external reporting.

The framework is designed to support regulatory compliance and alignment with recognized industry standards, including the Mining Association of Canada’s Towards Sustainable Mining (TSM) initiative. Once fully implemented, the SMS will provide a scalable, auditable governance structure that strengthens risk management and supports alignment with TSM Level A requirements.

As part of this work, Wesdome drafted a Sustainability Management System Standard and a Document Control Standard in 2025, both of which are currently under internal review. The SMS Standard defines the overall management framework, while the Document Control Standard establishes how documents are created, approved, maintained and updated, ensuring consistent use of controlled information and supporting traceability, compliance and audit readiness.

Further development of the SMS will remain a priority in 2026, including governance through dedicated steering committees to support implementation and ongoing system maturity.

Responsible Mining Standards

In line with Wesdome’s commitment to responsible and sustainable mining practices, we adhere to relevant responsible mining standards and guidance. MAC TSM is a globally recognized program that supports mining companies’ management of their most important environmental and social risks. We began implementing the MAC TSM program in 2023 and each quarter, we report our TSM implementation progress to the TSSC of the Board.

At Kiena, we are currently concluding a 3-year implementation process, with site teams working to achieve Level A in all protocols. In 2025, an external consultant completed a review of our implementation progress against the Water Stewardship and Tailings Management Protocols, and Kiena achieved Level A for Water Stewardship and Level AA for Tailings Management.6 We also completed an internal progress assessment review for the remaining protocols, achieving Level A for the Safe, Healthy and Respectful Workplaces Protocol, Crisis Management and Communications Planning Protocol, and the Prevention of Child and Forced Labour Protocol. Kiena will undergo an external TSM verification process in 2026.

At Eagle River, during the reporting period we continued to advance preparations to begin the 3-year TSM implementation process in 2026. Wesdome has established a corporate commitment to reach Level A for the Indigenous and Community Relationships protocol across the Company in 2026. Eagle River will also continue to develop its gap assessment against the various TSM protocols during 2026. The results of that assessment will be used to develop a workplan that will guide Eagle River’s implementation efforts going forward.

In support of company-wide alignment with TSM, in 2025 we conducted a review of our entity-wide policies and made updates to our Environmental Policy and Sustainability Policy to better align with program requirements.

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Responsible Tailings Management

We are dedicated to responsible tailings management and have built an approach informed primarily by the requirements established by the Canadian Dam Association (CDA). Wesdome has also committed to implementing the TSM Tailings Management Protocol, as well as its supporting guides and tools. In developing and updating our tailings practices, including our policies, standards, and management plans, we have also considered the Global Industry Standard on Tailings Management (GISTM), including MAC’s detailed equivalency assessment that compares GISTM requirements with TSM tailings management components. This assessment, as well as MAC’s updates to the Tailings Guide and TSM Tailings Management Protocol, which seek to improve alignment with GISTM, provides practical guidance that Wesdome uses to inform our tailings governance and risk management.

Our current implementation efforts are focused on achieving consistent TSM application at all operations. In addition, a GISTM‑focused gap analysis at Kiena completed in 2023 is informing the development of tailings‑specific action plans and future enhancements to our management systems.

Industry Engagement

We engage and collaborate with industry through memberships and participation in industry associations, allowing us to monitor, learn and share best practices with our peers, and to benefit from industry associations’ knowledge and guidance.

Our Chief Executive Officer (CEO) sits on the Ontario Minister’s Mining Industry Council. In addition, Wesdome’s Chief Operating Officer (COO) sits on the Board of Directors of the Ontario Mining Association (OMA), while Wesdome’s VP Environment & Sustainability is the Committee Chair of the OMA’s Indigenous Relations Committee. We also have a representative on the OMA’s Environment Committee, and the OMA’s Health and Safety Committee. Additionally, we are members of the Québec Mining Association, where we sit on the Environment Committee and the Health and Accident Prevention Committee. Wesdome’s Director of Tailings and Water Management is a member of the Canadian Dam Association’s Mining Dams Committee and became the Committee’s Co-Chair in 2025.

Stakeholders and Rightsholders

We foster transparency and seek to understand our stakeholders’ needs and perspectives by discussing our sustainability expectations, goals, objectives, and performance with local communities, Indigenous groups, and stakeholders through tailored engagement strategies (see Community & Indigenous Relations).

Any feedback or correspondence we receive informs our daily operations and long-term planning. Through all our engagement efforts, we continuously work to cultivate respectful and mutually beneficial relationships with all stakeholders.

Sustainability Governance

Ultimate responsibility and oversight of ESG and sustainability-related aspects of Wesdome’s business, including the identification and evaluation of risks and opportunities, and performance monitoring, rests with the Board of Directors. Specifically, the Technical, Safety and Sustainability Committee (TSSC) of the Board provides oversight of our sustainability and ESG performance, which is discussed during each quarterly TSSC meeting. Oversight flows outward to Management. The Vice President (VP) of Sustainability & Environment, who is a member of the SLT and reports to Wesdome’s Chief Operating Officer (COO), holds responsibility for the Company’s sustainability strategy and sustainability and ESG performance reporting. Within our operations, members of the Eagle River and Kiena management team report directly to mine site General Managers, who report to the COO. Specific lines of accountability for sustainability and ESG performance from the operating-level up through to the Board of Directors are outlined here.

Operational sustainability and ESG performance is reviewed by the TSSC quarterly, including updates on:

Health and safety performance
External engagements, consultation and community investments
External complaints and grievances from community members or Indigenous groups
Environmental performance data such as the number of incidents and/or non-compliance events, inspections, and audits
Implementation of standards such as Mining Association of Canada’s (MAC) Towards Sustainable Mining (TSM) standards and systems such as the Sustainability Management System

In addition, the TSSC reviews year over year performance in material ESG areas, which is reported annually in Wesdome’s ESG reports. Ongoing reviews by the TSSC enable the Board to have more in-depth understanding and oversight of Wesdome’s potential impacts, while also helping to increase Board awareness of how the Company is performing against its goals, objectives and targets.

Wesdome conducts an annual Board evaluation review designed to evaluate the Board’s performance in overseeing the management of our impacts, including Wesdome’s sustainability impacts. This includes a self-assessment and peer review of each Board member’s performance through a questionnaire that all Board members are required to complete.

The Governance Committee of the Board is tasked with discussing the results of the review, and addressing any concerns identified. The Board of Directors, in turn, conducts an annual performance evaluation of Wesdome’s CEO. The Governance Committee is also tasked with reviewing all policies annually. Our Environmental and Sustainability-related policies, which are discussed in greater detail and are publicly available on our website, guide the conduct of our business practices. In 2025, we updated the Workplace Violence, Harassment and Discrimination Policy to meet evolving regulatory requirements in Québec. We also updated the Environmental and Sustainability Policies to better align with the MAC TSM requirements.

During onboarding and training, we share and review our suite of policies, which are also available on WesNet, Wesdome’s new intranet. WesNet was launched in 2025 and provides a centralized platform for communicating with our employees. We also post relevant policies (including our Health & Safety Policy and Environmental Policy) at visible locations across our mine sites and share them with contractors working at our operations or exploration sites.

ESG Materiality

Wesdome’s commitment to responsible mining and management of sustainability and ESG-related risks extends to managing any potential or actual impacts associated with our activities, or related to our operations or business relationships. Specifically, we focus on sustainability matters that could reasonably be expected to affect Wesdome’s cash flows, access to finance, or cost of capital over the short, medium, and long term (financial materiality), as well as significant impacts on the economy, environment, and people.

We regularly review our material ESG topics to ensure we continue to understand the sustainability issues most likely to affect the Company, as well as the impacts that our Company may have on the environment and people. We completed a review of our material ESG topics in early 2025, evaluating their continuing relevance and identifying new topics that have emerged since Wesdome’s initial 2020 materiality assessment. This review included mapping documented and managed ESG-related risks against key ESG reporting frameworks, including the SASB Metals & Mining Standard (2023), the GRI 14 Mining Sector Standard (2024), and the TCFD recommendations (2017).

For this report, we have retained the same list of material ESG topics on which we reported in our 2024 ESG Report. We are planning to conduct a full materiality assessment soon. In preparation, we will consider evolving trends in materiality, including double materiality.