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我矿主要用水平扇形深孔留矿法采矿。投产10来,进行了80余次深孔大爆破,采矿量210余万吨。大爆破药量一般为10～20吨,40吨以上的大爆破有两次。在历次大爆破作业过程中,从未发生过人身事故,轻微伤事故也未发生。使我们初步摸索到井下大爆破工作的一些规律,积累了一些技术数据,逐步掌握了大爆破必需采取的安全措施。特别是最近(1976年12月25日)一次药量为40吨的大爆破,我们吸取兄弟矿山的经
My mine is mainly horizontal fan-shaped deep-hole retention mining method. Put into operation 10 to carry out more than 80 deep hole blasting, mining more than 210 million tons. Big blast dose is generally 10 to 20 tons, 40 tons of large blast twice. In the course of the previous large-scale blasting operations, no personal accident occurred, minor injuries did not happen. So that we initially groping some laws of the underground blasting work, accumulated some technical data and gradually mastered the necessary safety measures for the blasting. Especially recently (December 25, 1976) a large blast of 40 tons, we learn from the brothers mine