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我矿矿脉厚度为0.1～0,6公尺,围岩为石灰岩,矿石与围岩硬度大致相等(f=10～12),使用浅眼留矿法开采,采幅宽度控制在0.8公尺以下。以往,凿岩爆破照例是使用38～44公厘的标准直径占头及32公厘的药包进行。但是,在分析薄矿脉开采的凿岩爆破特点以后,认为使用这种直径的炮眼崩矿并不合理。因此,试用了更小直径的炮眼进行崩矿,试验的结果完全良好,并已开始全面推广。
The thickness of mine veins is 0.1-0.6 meters, the surrounding rock is limestone, the hardness of ore and surrounding rock are approximately equal (f = 10-12), and mining is carried out by shallow-hole ore retention method with the width of width less than 0.8 meters . In the past, as usual, blasting drilling was carried out using 38 to 44 mm diameter standard head and 32 mm kits. However, after analyzing the characteristics of the rock blasting exploited by the thin-veins, the blasting of the blasthole using this diameter is not justified. Therefore, the trial of a smaller diameter blasthole collapse, the test results are completely good, and has begun full promotion.