磁法勘探技术在老矿区找矿中的应用及效果

Magnetic exploration technique and its application effects in old mining areas

文章主要通过典型案例分析,总结了危机矿山接替资源找矿专项中大比例尺直升机高精度航空磁测和地面高精度磁测在直接或间接找矿中的应用效果。湖北大冶铁矿首次部署了1∶10000大比例尺高精度直升机航空磁测,总精度达到±0.16nT。航磁资料可直接进行精细反演,取得了明显的直接找矿效果,充分显示了其在老矿山深部找矿中的技术优势;河北迁安铁矿首次对磁异常进行三维精细反演,对深部矿体进行了准确定位,有效地指导了钻探工程的部署;在安徽和尚桥玢岩铁矿老矿区发现了新的矿异常验证见矿,四川平川发现玄武岩中的铁矿以及在赛什塘寻找铜矿中,地面高精度磁测都发挥了重要作用。

This paper summarizes the application effect of large- scale aeromagnetic and ground high- precision magnetic survey in direct or indirect prospecting in continued resources exploration of the crisis mines project through analyzing typical cases. 1 ： 10000 aeromagnetic - survey was first deployed in Daye iron mine of Hubei , total accuracy reached ± 0. 16nT. Aeromagnetic data can conduct refined inversion directly , having got obviously direct detection, which fully demonstrates the technical advantage of aeromagnetie survey in ore prospecting of old mine. 3 - D refined inversion to magnetic anomaly in Qianan iron mine of Hebei was first used , which has carried out spatial emplacement of deep orebodies and guided the deploy of Drilling. A new anomaly found in Heshangqiao Porphyrite iron mine of Anhui was test and got mineral. Iron mine in basalt was found in Pingchuan iron mine of S ;ichuang , as prospected copper mine in Saishitang. From the above, ground high - precision magnetic survey plays a very important role.