The Application And Study Of Geophysics-geochemical Prospecting On Dongyaozhuang Gold Deposit Prospecting In Shanxi Province

Dongyaozhuang gold deposit which is one of typical greenstone belt gold deposit in Chinalocated in Wutai County of Shanxi Province. The deposit bedding developed in middle andlower parts of Hongmenyan Formation. Mining belt from north to south with the order Ⅲ,Ⅰ, Ⅱ three with belt, layered, layered production. Albite chlorite schists and sericitealbite(quartz)schists and are the ore-hosting rocks, Minerals are mainly pyrite, limonite,chalcopyrite, magnetite, arsenopyrite, etc.; non-metallic minerals are sericite, albite, quartz,followed by chlorite, calcite, mica and other green chloritoid, with intensive pyritization,silicification and carbonatization. The gold mineralizations are controlled byLijiazhuang-Dacaoping ductile shear zone and Taihuai-Lijiazhuang homoclinal reversingcompound syncline.Greenstone belt gold deposit in China and the word is important gold deposit. Theformation of the greenstone belt gold deposit follow elements migration, around the depositwill forming primary geochemical anomaly of Au, Ag, Cu, Pb, Bi.; In addition, Goldmineralization is relative to pyritization in Dongyaozhuang gold deposit. Maingold-containing mineral are disseminated and veinlet-disseminated pyrite, there are differentnotable electric between auriferous pyritization belt and wall rock. So, integrated geophysicaland geochemical methods playe an important role in circling exploration target and findingore-body.At the base of comparative analysis of typical greenstone belt gold deposit’s geologicfeatures and geological-geophysics-geochemical ore-prospecting models at home and abroad,summarized the features of ore-bearing layer, structure, metadiabase, ore-body, geophysicalgeochemical and ore-finding indexes, at last, established thegeological-geophysics-geochemical ore-prospecting model of Dongyaozhuang gold deposit.According to Dongyaozhuang gold deposit’s geological-geophysics-geochemicalore-prospecting model, carried out the rock geochemistry survey with the scale of1：10000and the induced polarization intermediate gradient scan whose scale is1：10000and networkis20m×100m in the range of2km~2across mining area of Dongyaozhuang gold deposit.Through the comparative analysis of geophysical and geochemical anomalies, the No.1geochemical anomalies is good agreement with the I.P anomalies, may be reflected by themineralization bodies. The range of No.1anomaly is0.27km~2, include Cu, Au, W, Bi, As, As,Sb. It’s characteristic is large scale, high anomaly intensity and good identity of concentration centres for elements. And high value of the IP anomaly zone. According to inducedpolarization symmetric four pole sounding and data2D inversion, the mineralization bodiesare30to250m deep, the distribution of spatially looks lenses, forecasting reserve may reach amedium-sized deposit scale. The proposals were brought forward to test drill-holes.