The effect of shoveling depth on the ore drawing of non-pillar sublevel caving method

Aiming at the technical problem of large loss and dilution in non-pillar sublevel caving mining method, the effects of shoveling depth on the index of the amount of drawing out ore, the ore recovery ratio and rate of rock mixing researched via using a single funnel ore drawing model with big structure parameters.The results show that the waste rock at the front face of the end of the ore drawing will invade the ore drawing process earlier than the top waste rock; when the shovel depth is small, the rate of rock mixing rate increases slowly and the hanging-up arch often occurs at the ore drawing hole; with the increasing of shoveling depth, the increasing rate of rock mixing rate enlarges and it is difficult to form the hanging-up arch in the ore drawing hole.Meanwhile, it is discovered that the inhomogeneous flow of ore and rock at the drawing hole is an important factor induced the waste rock at the front face of the end of the ore drawing invade the ore drawing process earlier and massively.