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一、概况南芬露天矿为水成变质矿床。矿石为含铁石英岩,顶盘为混合岩,底盘为角闪岩。矿石硬度一般为f=8～16。采场台阶高12米。用БС-1型钢绳冲击式穿孔机穿孔。主要用连续柱状装药的垂直深孔爆破法崩落矿岩。用СЭ-3型电铲采掘,采场用25吨自卸式汽车运输,顶盘剥离用准轨铁路运输。自1956年投产以来,爆破质量一直不好,其中主要是爆破后残留根底问题。由于留根底给矿山生产带来了极坏的影响。主要表现在:(1)使电铲采掘效率降低(一般要降低30～40％),增加了电铲构件的磨损和损坏;(2)使汽车不能正常运转,遇有根底就须绕道运行;(3)增加了处理根底的工作量,影响矿山生产组织工作和采掘正规循环;
First, the overview Nanfen open pit metamorphic mineral deposits. The ores are iron-bearing quartzite, the top plate is a mixed rock and the chassis is amphibolite. Ore hardness is generally f = 8 ~ 16. Stope height 12 meters. Perforated with БС-1 steel wire impact piercer. Mainly by continuous vertical columnar charge deep hole blasting caving ore. Excavation with СЭ-3 electric shovel, stope with 25 tons of dump truck transport, roof peel with rail transport. The quality of blasting has been poor since it was put into operation in 1956, with the majority of the problems remaining after blasting. Because of the root cause of the mine to produce a very bad impact. Mainly in the following: (1) to reduce the excavation efficiency of electric shovel (usually to reduce 30 to 40%), increasing the electric shovel components wear and damage; (2) to make the car can not be normal operation, in case of foundation to bypass operation; (3) Increasing the workload of processing the foundation, affecting the work of mine production and organization and mining regular circulation;