Application of IP mid-ladder and IP sounding methods in the exploration of Liushuwan gold deposit
The Liushuwan gold deposit in southern Shaanxi is typical pyrite-quarta-vein type located in the Proterozoic Fe-Cu metallogenic sub-belt of Hannan-beiba.Eearly exploration in the mining area was constrained by the point-to-point method around the mineralized alteration zone delineated on the surface,and the extension range and vertical distribution characteristics of the mineralized body are not clear.In order to further expand the scale of the ore body and accelerate the prospecting progress,high-power IP measurement was selected to explore the mining area in this paper.The measurement result of IP mid-ladder and sounding methods in the deposit shows that the gold orebody in Beiba mining area is strictly controlled by NNE or NS faults,and vein-like production in the fault or lithologic contact zone with large dip angle.The lower limit of the apparent polarization ηs anomaly is 5.00%,the maximum value of ηs is over 30.00%,and the resistivity is relatively low,manifested as low resistivity and high polarization characteristics,the striking direction is basically consistent with that of the structure,and most of them are banding.The strength and scale of IP1 and IP2 anomalies delineated by IP mid-ladder and IP sounding are quite striking and correspond well with known mineralized alteration zones on the surface.After drilling verification,a multi-layer mineralized quartz vein body was exposed,and a gold mineralized body was endowed in the vein body,which basically coincided with the anomalous part,and the development location and spreading characteristics of the mineralized body were basically identified,and a better effect of geological prospecting was achieved.It is considered that this method can effectively guide the drilling deployment and is one of the important technical means for the exploration of polymetallic deposits,and can be used as the preferred geophysical prospecting method in the later exploration process of the gold deposit.
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