阶段崩落采矿法,通常多用于开采品位较低的大型金属矿床。美国、智利和菲律宾的许多斑状铜矿和钼矿都用阶段自然崩落法开采,苏联的一些大型铁矿也多半采用阶段强制崩落法。阶段崩落采矿法的主要优点是效率高、成本低。但是,由于它通常都是在采矿场底部布置许多放矿漏斗和电耙巷道,并在放矿漏斗上全面拉底,因此采准切割工程量很大,准备时间 Stage caving mining method, usually used for mining lower grade of large metal deposits. Many plutonium and molybdenum mines in the United States, Chile and the Philippines are mined by natural coffers, and most of the Soviet Union’s large-scale iron mines also use stage-forced caving. The main advantages of the mining process are the high efficiency and low cost. However, because it is usually arranged in the bottom of the mining lot of funnel and electric rake roadway, and in the funnel pull the bottom of a full, so take the cutting project a large amount of preparation time