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南非的芬斯奇(Flnsch)金刚石露天矿,日产矿石5200米~3(12000吨);1967年开始剥离,日剥离6000米~3(18750吨)。露天矿阶段高12米,深124米,采至1990年即转入坑内开采。运输平台宽18米,用螺旋道延深,最大坡度8％。穿孔:岩石用Ingersoll—Rand Haulmasters旋转冲击钻机,软矿石用Schramm旋转钻机。岩石炮孔直径165毫米,矿石炮孔直径171毫米。所有的炮孔钻70°,其垂直深度为13
South Africa’s Flnsch diamond open-pit mine, Nissan ore 5200 m ~ 3 (12000 tons); 1967 began to peel, daily peel 6,000 to 3 (18,750 tons). Opencast mine stage 12 meters high, 124 meters deep, mining to 1990 that transferred to pit mining. Transport platform width of 18 meters, with spiral deepening, the maximum gradient of 8%. Perforation: Rock Ingersoll-Rand Haulmasters rotary impact drilling rig, soft ore with Schramm rotary drilling rig. Rock hole diameter 165 mm, ore hole diameter 171 mm. All bore holes are drilled 70 ° with a vertical depth of 13