Characteristics of Primary Haloes of the VII Vein in the Wannian Silver-Gold Deposit, Jiangxi Province and Deep Orebody Prediction

This paper describes the geochemical characteristics of primary haloes of the VII vein in the Wannian silver-gold deposit,Jiangxi Province.The factor analysis results show that F1 stands for Ag mineralization in the quartz-multimetal sulfide stage,F2 stands for Ag and Au mineralization in the fine particles sulfide stage,which reflects this deposit has a feature of one period of Au mineralization and two periods of Ag mineralization.The Ⅶ vein hosts 3 primary halo belts from the southwest to the northeast.The 2nd primary halo belt exhibits an obvious unusual zoning sequence(from high to low) : Sn-Au-Cu-Mn-B-Mo-Ni-F-Ag-Cr-Hg-Pb-Zn-W-Bi,where the trail halo and the front halo are superimposed in its end part.Geochemical parameters with a variation ofdown-up-down-upalso indicate the existence of deep orebodies underneath.Metallogeny shows the Ⅶ ore body occurs in the Ⅶ structural fracture belt and is strictly controlled by it.The lateral extension of the thick orebody to the deep part is in NE direction in a form of en echelon.The thick orebody and the higher product of Ag-Au grade and the thickness of ore body both have an evident extension in the area blow the-235 m level between the 46th-56thexploration lines as favorable prospecting indicators.Based on these data,a three-dimensional deep orebody prediction model is established to provide evidence for the further exploration work.