Abstract:The high blasting block rate has always been a technical problem that plagues many open-pit mines at home and abroad. Due to the complex geological conditions of the mining area and the superposition effect formed during blasting, the phenomenon of high blasting block rate is particularly obvious in the open-pit mine of Yinshan Mine. For this reason, for the areas where the lithology of the open-pit mining field is complex and prone to large blocks, based on the physical and mechanical properties of the rock, it is calculated that the phyllite and porphyry blasting areas need to add short holes. In order to reduce the generation rate of large blasting blocks, a medium-deep hole blasting method—deep-shallow coupled step blasting method is proposed. After the method is implemented, the blasting block rate is effectively controlled, and significant social and economic benefits are achieved.