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在地下开采的金属矿山,倾斜中厚矿体由于产状和赋存条件不利,采矿方法的选择往往是个比较复杂的问题。当顶盘围岩比较稳固时,房柱法具有结构简单,采准工程量小,劳动生产率高,采矿成本低等优点,但矿柱损失大而且一般只宜用于倾角小于25°的矿体,否则便可能发生滚石伤人的危险,作业条件也趋困难,工作效率显著降低。爆力运矿空场法也有房柱法类似的优点,且人员不必进入采空区作业,但是要求矿体倾角最好在35～40°以上。反之则爆距不到30～35米,需增设分段耙运平巷和大量放矿漏斗,矿柱损失和采切工程量将成倍增加,同时还由于底板残留大量矿石,回收率相应降低。
In underground mined metal mines, the choice of mining methods is often a more complicated issue due to the poor tectonogenesis and preconditions of inclined medium-thick ore bodies. When the roof rock is relatively stable, the method has the advantages of simple structure, small amount of quasi-engineering work, high labor productivity and low cost of mining. However, the pillar loss is large and generally only suitable for ore body with dip less than 25 ° , Otherwise it may happen that the risk of rolling stones, working conditions also become more difficult, work efficiency significantly reduced. There are also similar advantages of the method of house-pillar method in the opencast mine, and the personnel do not have to go into the goaf. However, it is required that the dip angle of the orebody is better than 35 ~ 40 °. On the other hand, the burst distance is less than 30-35 meters. Additional staging rakes and a large number of mining funnels are required. The loss of pillars and the amount of cutting and cutting work will be doubled. Meanwhile, due to the large amount of residual ore left on the floor, the recovery rate will be correspondingly reduced .