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基洛夫磷灰石生产联合公司中央矿,从1964年起在腊斯乌姆卓尔高原以露天法开采磷灰石矿。至今已开采矿石3.988亿吨,矿石的P_2O_5品位平均为17.53％。1986年该矿采剥总量为2221.2万米~3 ,平均剥采比为1.3,采矿量已超过生产能力220万吨,占全公司总产量的50.1％。近几年的下采速度平均约10米。二十年内开采深度已达275米。在露天矿平面尺寸较小(3.35×1.5公里)的条件下,开采强度却提高很大。例如,1米~2矿体有效面积的采
Apollo Apatite produces the joint company Central Mine, which has been producing open-pit apatite ore since 1964 on the Lansom Highlands. So far, 398.8 million tons of ore have been mined, and the average P_2O_5 grade of ore has been 17.53%. In 1986, the total number of mined flats was 22.212 million m 3, with an average stripping ratio of 1.3. The mining volume exceeded 2.2 million tons of production capacity, accounting for 50.1% of the total output of the company. Mining rate in recent years on the average about 10 meters. Twenty years of mining depth has reached 275 meters. In the open-pit mine the smaller size (3.35 × 1.5 km), the mining strength has increased greatly. For example, mining effective area of 1 m ~ 2 ore body