Control Blasting For Slope Stability At The Adams Mine

CIM Bulletin, Vol. 71, No. 793, 1978

Barry J. Morash, Pit Superintendent, The Adams Mine, Kirkland Lake, Ontario

The over-all slope angle of between 55 and 60 degrees at the Adams Mine necessitates control blasting on the final pit walls. The control blasting techniques used are pre-shearing and buffer blasting. Pre-shearing with 21/2-inch holes on 5-foot centers is used in areas where jointing and rock type are not conducive to smooth stable walls. Buffer blasting with 121/4-inch holes is used in areas where the rock is competent. Control blasting adds to the operating costs, but can result in substantial savings in increased slope angle and reduced stripping.
Keywords: Rock mechanics, Control blasting, Slope stability, Adams Mine, Pre-shearing, Buffer blasting.