Waste and
Hazardous Materials Management
Our operations generate hazardous and non-hazardous waste, including metal, wood, plastics and other materials as part of ore processing, operation of heavy equipment and a large variety of activities that occur as part of our business. We are committed to responsibly managing the waste we produce to minimize potential environmental and human health impacts. Our waste management approach is guided by our Environmental Policy. Waste and hazardous materials risks are primarily associated with improper handling, storage, or disposal practices, which can result in environmental contamination, impacts to wildlife, and regulatory non-compliance. These risks are managed through site-specific waste management procedures, secure storage and handling protocols, and contractor management, supported by regular inspections and monitoring to promote compliance and minimize potential environmental impacts. Details on how we manage our hazardous and non-hazardous waste, respond to waste-related incidents and safely use cyanide in our operations, are discussed further on our website.
In 2025, we did not have any incidents of non-compliance associated with waste and hazardous materials management permits, standards, or regulations, and we did not experience any significant spill events at either Eagle River or Kiena.
Annual Performance Summary
Non-Hazardous Waste
We produce non-hazardous waste such as paper, wood, steel, and domestic waste. Non-hazardous materials generated through our operations are sorted, stored, and managed through site-specific handling practices designed to prevent environmental releases, minimize wildlife interactions, and maximize opportunities for recycling and responsible disposal.
We have been working since 2021 to develop on-site recycling initiatives at Eagle River. We recycle electronic waste, scrap metal, wood, and camp furniture such as mattresses. Kiena relies on the City of Val-d’Or’s municipal recycling services to manage paper, wood, and metal waste. At Kiena, waste is sorted both on surface and underground and recycled wherever possible.
In 2025, we conducted clean-up campaigns at both mine sites. At both mines, we also conducted training and awareness-raising on the importance of segregating waste.
At Eagle River, volumes of non-hazardous waste generated in 2025 decreased relative to 2024 (from 1,346 tonnes to 932 tonnes), reflecting improved waste segregation and disposal practices. At Kiena, non-hazardous waste volumes increased year-over-year, rising from approximately 1,069 tonnes in 2024 to 1,381 tonnes in 2025, primarily driven by site cleanup initiatives.
Hazardous Waste
Through our mining and processing activities, we generate hazardous waste streams that require careful handling and disposal. These primarily include waste oils and lubricants, used filters and contaminated absorbents, chemical containers and residues, and other maintenance- and processing-related waste. These materials are classified and managed in accordance with applicable regulatory requirements and site-specific procedures to prevent environmental contamination and protect worker health and safety.
At Eagle River, collected waste is stored in a hazardous waste transfer facility, before being removed off-site monthly by a third-party waste contractor. In 2025, we implemented a new Hazardous Waste Storage, Handling and Disposal Procedure focused on strengthening hazardous waste management practices and improving education and training for employees and contractors. We also upgraded signage and information boards inside the hazardous waste storage facility to promote accountability for proper waste handling, and delivered training to increase compliance with our procedures. Eagle River additionally began upgrading its hazardous waste storage facility, and this work will continue in 2026.
At Kiena, hazardous waste is stored in secured sea cans on the surface. Waste is then collected and transported off-site by a third-party contractor, in line with regulatory requirements in Québec. Kiena continues to work to identify options for further improving its storage facilities, given the limitations of its location on Parker Island. In 2025, we focused on ongoing education and awareness raising about proper waste segregation at the site, with this work set to continue in 2026.
Volumes of hazardous waste generated at Eagle River increased from approximately 118 tonnes in 2024 to 168 tonnes in 2025, driven by higher production levels, fleet expansion, and improved waste tracking and segregation practices.
In 2025, Eagle River expanded its hazardous waste management program to include the tracking and recycling of materials such as waste oils, filters, absorbents, and contaminated maintenance materials. By year-end, 56 tonnes of hazardous waste had been recycled on-site or through approved third-party providers, up from zero in 2024, reflecting a shift toward greater material recovery and improved recycling oversight.
At Kiena, hazardous waste volumes remained relatively stable at 192 tonnes in 2025, compared to 196 tonnes in 2024.1 Hazardous waste recycling increased from 38 tonnes to 51 tonnes year-over-year.
1 The 2024 ESG Report misstated total hazardous waste generated at Kiena in 2024 as being 159 tonnes. The restated figure is 196 tonnes (+23%).
ZERO
significant spill events in 2025
Cyanide Management
Gold mining operations commonly use cyanide to separate the metal from rock. To protect the safety of our workforce and the environment, both Eagle River and Kiena implement stringent management practices for cyanide used in our operations (for more details, see our website). At Eagle River, cyanide is delivered as a pre-mixed solution, reducing direct handling by employees. Cyanide dosing is carefully controlled during ore processing to optimize gold recovery and minimize excess use. Hydrogen peroxide is then used to reduce residual cyanide concentrations prior to discharge or storage. At Kiena, in preparation for mining operations to restart, a cyanide destruction circuit was commissioned in 2022 that eliminates cyanide from tailings waste before it is stored in the TMA or used in underground paste backfill.
Spill Management
Eagle River and Kiena have spill management plans in place that guide spill response and outline training, prevention protocols, equipment inspections, and reporting procedures. Spill response is governed through site-specific spill management plans, procedures, training, and reporting protocols overseen by Health and Safety and Environment teams, with support from Mine Rescue teams when required. All spills are tracked, investigated, and reported to regulatory agencies and Indigenous communities, as required. We did not experience any major spill events in 2025. At Kiena, we upgraded all spill intervention equipment and response kits during the reporting period. We also expanded our site environment response team, which is responsible for responding to chemical spills, and delivered additional training to the team.
Waste Generated and Waste Recycled
Performance
Indicators:
SASB: EM-MM-150a.5, EM-MM-150a.6, EM-MM-160a.2, EM-MM-540a.1, EM-MM-540a.2, EM-MM-540a.3 (partial)
GRI: 2-4, 3-3, 14.6.2, 14.6.3
