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在1961年之前戈罗勃拉哥达茨基铁矿床主要用倾斜钻孔崩落矿石的阶段房式采矿法进行开采。在本矿床的条件下该采矿方法的缺点是:掘进工作量很大(每千吨矿石储量需采准巷道6.5—7.5米),由于矿体是倾斜的,必需切穿很多下盘岩石(达矿块矿石储量的20%),钻进深度超过40—45米之爆破钻孔的劳动量大,特别是在形成开割槽时,顶柱突然下沉频繁或者矿石间夹层涌出,这些都造成严重的危险性,并引起用于形成新的开割槽的
Before 1961, the Gorodobracka Dzitsky iron deposit was mined mainly by the stage-by-stage mining method of sloping borehole ores. The disadvantages of this mining method under the conditions of this deposit are that the amount of boring work is very heavy (6.5-7.5 meters of roadway per thousand tons of ore reserves shall be taken). Since the ore body is inclined, it is necessary to cut through a lot of footwall rocks 20% of the mine’s ore reserves), the amount of labor required for blasting drilled holes to exceed 40-45 meters is high, especially when the top column suddenly subsides or sinks intermittently during the formation of cutting flutes, Caused serious danger and caused the formation of a new cutting slot