CSAMT在老矿山深部隐伏矿体预测中的应用

The application of CSAMT in prediction of deep-seated concealed orebodies in old mines

夹皮沟金矿近几年资源已近枯竭,浅部矿基本开采殆尽,深部地质信息相对较少。2013年国家在该矿山实施了老矿山深部找矿,如何探查500m以下深部找矿信息,常规的物探方法已达不到这样的勘探深度,况且矿区的游散的电干扰也较严重。本次工作通过可控源音频大地电磁测深法(CSAMT)取得了数据质量可靠的剖面异常,通过两个钻孔的验证,在深部不同程度地见到了金银矿体,与物探解释部位吻合较好,为该矿区深部资源潜力评价提供了依据,同时也为矿区其他区段开展深部找矿方法奠定了基础。

In recent years Jiapigou gold deposit is facing problems including depleted resource,exhausted ore-bodies at shallow part and relatively less geological information about deep part.In 2013 China established a deep ore prospecting plan for this deposit and aimed at finding more prospecting information about deep ore prospecting works below 500m.Conventional geophysical prospecting method couldn’t reach parts of the mine at such depth,and the mining area was under the influence of severe electrical interference by stray cur-rent in the mine.Through the works of the authors,CSAMT found several profile anomalies with reliable data,and Au-Ag orebodies of various grades were seen at deep part through drilling verification of two bore-holes which matched well with geophysical interpretation.This paper provided basis for resource potential assessment of deep part of the mining area and laid foundation for developing deep ore prospecting methods in other sections of the mining area.