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大冶铁矿东露天采场开采凹陷深度达200m,采场空间小、平台窄,由于边坡稳定的需要,1988年将 KY-310牙轮钻机φ310mm 钻具改为钻孔φ250mm,以减小矿岩爆破力使爆破
Due to the need of slope stabilization, the excavation of the φ310mm drilling tool of the KY-310 cone drill was changed to φ250mm for drilling in 1988 to reduce the depth of mining depression to 200m in the open pit of Daye iron mine. Blasting power of ore makes blasting