Abstract: To improve the blasting effect and reduce the cost of coal-rock bench blasting in Anjialing Open-Pit Coal Mine, the effect of several factors on the bench blasting results are studied in depth, including the rockmass joint and fissure, hole-spacing parameters, detonation mode and long-hole explosive charging technique. In view of the problems of tight bottom and large fragmentation encountered in the blasting process, technical measures such as changing and regulating the hole-spacing pattern parameters, charging structure, unit consumption of explosive, position of detonation cartridge and millisecond interval are taken to improve the blasting effect of coal-rock bench. The practice shows that these optimized blasting techniques can improve the overall production efficiency of this mine and meanwhile, control in certain degree the mining cost.

Key words: Open-pit mine, Bench blasting, Blasting parameters