甘南某金矿地球物理探测与冒顶事故分析

Analysis of overlay rock masses collapse and safety evaluation of stope for a gold mine in southern Gansu based on geophysical exploration

甘南某金矿3号矿体采用空场法开采,于2006年12月4日采场发生冒顶坍塌,造成矿山停产。为了恢复矿山生产和今后矿山生产安全,需要进行采场坍塌原因分析,了解采场塌埋填实情况,以便采取相应安全措施,保证采矿安全。为此,首先根据3号矿体的地质、采矿条件,分析了采场坍塌原因及其主要影响因素。在此基础上,采用地球物理勘探技术,进行了采场空区的电磁法探测,由此揭示了采场的空区填埋情况。同时,圈定了深部矿床的异常区,不仅为矿区恢复生产提供了重要设计依据,而且为矿山深部资源开发提供了重要的参考价值。

The orebody No. 3 of a gold mine had been exploited by using openstope method. The production halted on December 4, 2006 because of the collapse accident of stope. In order to recover production and ensure the productive safety for the future, it is necessary to analyze the cause of caving and find out the actuality of fill-up. After geologic and stope investigation of the orebody No. 3, the cause of collapse is analyzed. Then the geophysical exploration technique, electromagnetic method, is used to detect the status of quarry. The exploration results not only open out the fill-up of dead zone, but also find out the abnormal zone of mineral deposit. It will be the evidence of recovery production and is recommended as reference to the future design.