Investigation of a complex rock slope displacement at Brenda Mines

CIM Bulletin, Vol. 73, No. 820, 1980

PETER N. CALDER, Professor and Head, Mining Engineering Department, Queen's University, Kingston, Ontario, GARSTON BLACKWELL, Chief Mine Engineer, Brenda Mines Limited, Peachland, B.C.

The history and analysis of a structurally complex open-pit rock slope displacement are described. The failure involved part of the only haulage access to a major ore zone. The ongoing movement was monitored using an electronic distance-measuring device and a continuous electronic system specifically designed for the problem. A major fault, infilled with a thick clay gouge, and intersected by other structural features, resulted in the transfer of weight to a rock mass acting as a buttress in the lower regions. Movements were affected by blasting vibrations and ground-water conditions. Remedial measures included limiting blasting levels and lowering the water table, following which mining was successfully resumed in the area.
Keywords: Rock mechanics, Slope displacements, Pit slopes, Brenda Mines, Faults, Blasting, Monitoring systems, Failure analysis, Safety factors, Drainage.