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在该企业的各矿山中,巷道掘进是沿普氏硬度系数为8—15的石英岩-斑岩和其它围岩进行的,而回采工作(分层崩落采矿法、留矿法、支护和充填采矿法、分段巷道采矿法)是在节理发达的花岗岩-正长岩-斑岩和其它硬度系数为6～10的含矿围岩中进行的。矿体厚度变化在1到12米之间。最近几年,该矿山大大改进了凿岩爆破工作。从1960年开始用高频冲击式ΠР-24ЛБ和КΠТ-36凿岩机代替了ΠР-30 К、ΠТ-45型凿岩机。这些凿岩机在达段时间钻凿了约80%的炮孔。ΠР-30К凿岩机仅用来钻凿15米或更深的炮孔。为了达个目的采用支架式КС-50和КЦМ-4型凿岩机。同ΠР-24Л型凿岩机比较,旁侧供水的ΠР-24ЛБ型凿岩机可使冲洗水由3升/分增加到5—6升/分,并且在工作
In each of the mines in the enterprise, tunneling is carried out along quartzite-porphyry with a Plesi hardness coefficient of 8-15 and other surrounding rock, and the mining work (stratified caving mining, retaining method, supporting and Filling mining method, sub-roadway mining method) is developed in the joints of granite - syenite - porphyry and other hardness coefficient of 6 ~ 10 in the ore-bearing rock. The thickness of the ore body varies between 1 and 12 meters. In recent years, the mine has greatly improved drilling and blasting work. Since 1960, ΠР-30 К and ΠТ-45 rockdrills have been replaced by high-frequency impact ΠР-24ЛБ and КΠТ-36 rockdrills. These rock drills drilled about 80% of boreholes up to the deadline. ΠР-30К rock drill only used to drill 15 meters or deeper hole. In order to achieve the purpose of using bracket КС-50 and КЦМ-4 rock drill. Compared with the ΠР-24Л type rock drill, ΠР-24ЛБ type rock drill can provide flush water from 3 liters / min to 5-6 liters / min, and in working