克里沃罗格铁矿区的坚硬和极硬铁矿石,采用扇形深孔、深孔组及置于坑道底板上的集中裸露药包(药室)爆破法进行崩落。炮孔崩矿的技术经济分析表明,深孔钻进费用因岩石性质而异,如果矿石的 f=10～12,则占采场全部劳力费用的30％以上;如 The hard and extremely hard iron ore in the Krivoyargo iron ore area is caved in using scalloped deep holes, deep hole sets and a concentrated bare bale (pharmacy) blasting method placed on the tunnel floor. The technical and economic analysis of blast-hole collapses shows that the cost of deep-hole drilling varies with the rock properties, and if the ore f = 10-12, it accounts for more than 30% of the total labor cost of the stope;