Klohn Crippen Berger (KCB) carried out the completion of the environmental studies required to obtain the Environmental Assessment Certificate for this proposed 30,000 tpd open pit copper/gold mine. The work also included engineering design of the tailings facility (80 m-high cyclone sand dam), mine rock dumps and open pit. KCB provided geotechnical, water management, and environmental services for the feasibility study and the Environmental Impact Assessment .
A significant feature of the project involved an Environmental Assessment due to its proximity to Morrison Lake, which is part of the Babine Lake – Skeena River salmon fisheries systems that is the largest salmon habitat area in British Columbia. The Environmental Assessment included determination of acid rock drainage and neutral metal leaching concentrations, groundwater modelling and surface water modelling to determine potential effects on the receiving water quality. Seepage mitigation works included lining the tailings impoundment and placement of all acid generating water rock back into the open pit on closure.
The work included design of a high-density sludge water treatment system and a diffuser pipeline into Morrison Lake (60 m-deep). Lake modelling was carried out to determine the mixing potential of the lake and the changes in water quality with time.