Application of diversion drawing technology in chambishi copper mine

The No.5 panel of main mining area in Chambishi copper mine is inclined medium-thick orebody, which has been mined by the method of sublevel caving. The stability of ore and rock is moderate. The problem of high loss and dilution rates in practice has not been solved properly for several years. The paper started from the formation of waste funnel under the inclined boundary condition and found out the direct reason which caused the large remained mass in footwall was that the top waste arrives at the drawing point quickly. Then diversion drawing technology was proposed. It is that triangular pillar is arranged on top of the stope and only the side of footwall is blasted to the stope of upper sublevel as to form the diversion opening, which can slow down the moving down of the roof waste and lead gravity flow of granular media to the side of footwall at the beginning of drawing. After the implementation of the scheme, the loss and dilution rates of experimental stope were reduced by about 6 percentage points, ie., a remarkable success.