We recognize that mining can affect nearby communities and our workforce through activities such as drilling, blasting, and hauling, which generate noise, vibration, and air quality impacts. Guided by Wesdome’s Environmental Policy, we seek to understand and minimize those impacts across our operations.
Our air quality management efforts focus on controlling emissions from mining activities such as blasting and hauling, and we measure non-GHG emissions in line with regulatory requirements. We also manage dust from haul roads, stockpiles, and crushing by applying water and approved suppressants. Our noise management efforts focus on minimizing impacts to the environment and human health associated with drilling, blasting, and underground ventilation. At Kiena, since blasting and heavy machinery can also cause ground vibrations that disturb nearby communities and ecosystems, we aim to proactively manage our vibrations through community engagement, expert input, and the use of monitoring equipment. Details on our air quality, noise, and vibration management are available on our website.
Annual Performance Summary
In 2025, all air quality results remained compliant with our reporting thresholds, established by Canada’s National Pollutant Release Inventory. Details of our air quality performance for 2025 are available in our ESG Data Book. There were no significant incidents or non-compliance events related to air quality, noise, or vibration management at either site.
At Eagle River, given the distance from nearby communities, air quality, noise, and vibration management centres on industrial hygiene and reducing impacts on our workforce. During the reporting period, we continued our ongoing management of these material topics as well as expanding the site-wide fugitive dust monitoring program. In 2025, Eagle River recorded a notable increase in particulate matter (<10µm), with recorded levels reaching 157.3 tonnes, up from 34.6 tonnes in 2024. This increase was associated with improved tracking and determination of traffic volume and flow.
In Quebec, Kiena is located in close proximity to a residential community and our operation and exploration activities produce noise impacts. Noise has been raised as a concern by nearby residents during engagement in previous years, and we manage this aspect very closely. We use low-noise producing ventilation equipment and have installed noise-suppression wrapping on our surface exploration drills. In 2025, we made noise assessment a mandatory component of evaluating new surface equipment, so we can be considerate of impacts and look at mitigation and management of noise proactively. During our surface exploration drilling season, we monitor our noise levels continuously through monitoring and data interpretation, enabling us to make adjustments in a timely manner.
During previous reporting periods, vibration emerged as a concern for some residents near Kiena. This was linked to blasting activities that occurred to construct a new exploration ramp underground, which began in 2023. The ramp is located next to the Kiena TMA, in close proximity to the Val-d’Or neighbourhood of Dubuisson. However, by 2025, blasting was occurring deeper underground, therefore limiting vibration impacts and the topic has not emerged as a concern during community engagement since that time.
ZERO
exceedances of noise-related parameters or noise-related grievances in 2025.
Performance
Indicators:
SASB: EM-MM-120a.1
GRI: 3-3, 305-7 (partial)
