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东川矿务局落雪矿稀矿山矿段于1982年5月9日成功地进行了一次国内最大规模的地下深孔爆破。炸药总量为128.9吨(主要是2号岩石炸药),总崩矿量达39.5万吨。这次大爆破是在沿走向长226米、垂高60米范围内的五个采场的间柱、顶柱、部分矿房和上阶段采场的底柱中进行的。总钻孔量为62830米,其中大孔约占17％,中深孔约占83％。采用由主传爆线与
Dongchuan Mining Bureau snow snow mine block mine on May 9, 1982 successfully conducted a domestic one of the largest underground deep-hole blasting. The total amount of explosives was 128.9 tons (mainly No. 2 rock explosives), with a total amount of 395,000 tons of total colluvial deposits. The big blasting was carried out in the middle column, top column, some mines and the bottom column of the stope in the five stopes along the length of 226 meters and the height of 60 meters. The total drilling volume of 62,830 meters, of which about 17% of large holes, deep holes accounted for about 83%. Adopted by the main blast line with