Because of the problems such as low efficiency of ore drawing and huge load of picking and cutting, the extraction of flat dip medium thick and thick orebodies has been regarded as a challenge by the world mining circle. 缓倾斜中厚~厚矿体的采矿,因采场出矿运搬效率低、采切工作量大等突出问题,一直被视为一世界采矿难题。