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天井分层崩矿采矿方法是深孔留矿采矿方法的一种方案其要点是在矿房中作穿凿岩天井,在天井中按若干小分层凿輻射狀砲孔、單层或多层爆破回采矿石。其优点是安全,采准量少及采矿效率高。采用此法进行了試驗,該矿床为:磁鉄富矿、层理发达绿泥夾层較多,不稳固而坚硬(f=12～14),厚为16公尺的急傾斜矿体,上盤为不稳固的矽软岩石f=4～6,下盤为石榴岩、角閃岩綠泥岩等f=5～9。 479号采矿场是延矿体走向佈置,其矿块参数是
Pavement subsidence mining method is a deep-hole ore mining method of a program of its main points in the mine for the drilling shaft of the patio, in the courtyard according to a number of small-scale radial gun-shaped hole, single or multi-layer blasting Mining ore. Its advantages are safety, low acquisition and mining efficiency. Experiments were carried out by this method. The deposit is composed of magnetite ores, strata with developed green mud interlayer, unstable and hard (f = 12 ~ 14), steeply inclined ore body of 16 meters in thickness, F = 4 ~ 6 for unstable silicon soft rock, pumice for lower plate, amphibolite rock greenstone, etc. f = 5 ~ 9. No. 479 mining ore body is oriented toward the layout of the ore block parameters are