Western Copper and Gold Corporation

Erosion & Sedimentation Risk Assessment

Erosion & Sedimentation Risk Assessment ensures ESC measures are commensurate with site-specific risks to downslope aquatic ecosystems

Western Copper and Gold Corporation is proposing to develop the Casino Project, a copper-gold-molybdenum mine about 300 km northwest of Whitehorse in west-central Yukon. In support of the projects’ fisheries baseline and impact assessment program, Palmer Environmental Consulting Group Inc. (PECG) developed a strategy for systematically evaluating and mapping the site-specific risks posed to aquatic habitats (watercourses and waterbodies) from erosion and sedimentation originating in upslope construction areas.

PECG used a GIS platform to efficiently and objectively complete the spatial analyses necessary to determine each site’s erosion potential and its potential ecological consequence of off-site sediment transport, culminating in the determination of the overall erosion and sedimentation risk. The low-moderate-high risk ratings were communicated to project engineers, along with recommendations for erosion and sediment control measures that are commensurate with the site-specific risks. The up-front representation of risks and how they will be addressed is anticipated to help streamline the regulatory review process.