Magnetic exploration technique and its application effects in old mining areas

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 aeromagnetic 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.