我矿是一个小型有色矿山。七九年在负七十五米中段一号矿体进行分段空场法试验。三年来,已回采了四个采场,共采矿石十四万多吨。实践证明,此采矿法比原低分段空场采矿法具有开采强度大、效率高、安全性好等优点。我矿已初步掌握在赋存比较复杂的矿体中进行分段采矿法开采的基本规律。现将我矿初步试用此采矿法的情况介绍如下:一、矿床主要地质特征我矿属于中低温热液裂隙交代矿床,矿体赋存于砂岩、石灰岩之间的断碎不整合面内, Mine is a small non-ferrous mine. In mid-1975, the No. 1 ore body at Seventy-nine in a sub-field test. In the past three years, four stopes have been recovered and over 140,000 tons of ore have been recovered. Practice has proved that the mining method than the original low section of the open pit mining method with mining strength, high efficiency, good safety and so on. My mine has initially mastered the basic law of sub-mining mining in the more complicated ore body. The preliminary trial of this mining method in our mine is as follows: I. Main geological characteristics of the deposit The mine belongs to the hypothermal hydrothermal fractures metasomatic deposit, and the ore body occurs in the broken unconformity between sandstone and limestone.