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牟定铜矿自投产以来,对5～7米厚的矿体均采用有底部结构分段空场法采矿。该法采出的矿量占总采出矿量的97～97.6％,因采用此法,采切总量大,采切千吨比高,采矿周期长,矿损失贫化大,采矿成本高,为此,从1978年起,对厚度5～7米的矿体,分别在三个中段8个采场进行中深孔房柱法回采试验获得成功,共采出矿量47365吨,铜金属359吨,品位为0.76％。现将该法在牟定铜矿推广后的实践介绍于后。
Mouding copper mine has been put into production since the 5 to 7 meters thick ore body are used at the bottom of the structure of the sub-field method mining. Due to the adoption of this method, the total amount of mining and cutting is large, the cut-off ratio of kilotonite is high, the mining cycle is long, the mine loss is poor and the cost of mining is high Therefore, starting from 1978, the success of the middle-deep-hole post-mortem mining test on 8 ore blocks with thickness of 5 to 7 meters in 8 middle three sections respectively achieved a total recovery of 47,365 tons of copper metal 359 tons, grade 0.76%. The law is now Mouding copper mine after the promotion of practice introduced later.