Kemess South Mine Closure and Reclamation

CIM Montreal 2011
Jennifer McConnachie, Carolyn Johns, Jordan Evans,
Abstract Kemess Mine will be closing in early 2011, and final reclamation works began during operations in 2008. The focus of reclamation during mine operations has been on the inactive areas of the tailings dam, waste rock dumps, and expended borrow areas. The general reclamation strategy for the Kemess Mine site marries long-term erosion control with successional reclamation principles. For disturbed areas, this requires application of appropriate growth media, proper preparation of surfaces, and introduction of native pioneer species to initiate successional processes of recovery.
Tailings are retained behind an earthfill dam of approximately 140 m in height with a crest length in excess of 1 km. Reclamation activities at the dam have included placement of growth media, specialized surface preparation and construction of diversion ditches. The final closure spillway is currently being constructed with completion scheduled for summer 2011.
The waste rock dumps contain non-acid generating (NAG) waste rock and potentially acid generating (PAG) waste rock. Resloping of the NAG dump for long-term stability commenced in 2009, followed by placement of growth media and ground preparation. The PAG waste rock will be fully relocated into the expended open pit for subaqueous disposal by the end of mine life.
Keywords: Reclamation, native seed, Waste rock, Tailings
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