Characteristics of Primary Halos and Prediction of the Orebody No.3 in the Shangcheng Gold Deposit,Anhui,China

The primary halo method has great guiding significance on identifying the possible existence of concealed gold deposit,its scale,buried depth and erosion depth.In this study,the structural characters of the primary halos of orebody No.3 in Shangcheng gold deposit is analysed as a reverse geochemical zonation sequence Ag-Hg-Pb-Zn-Cu-Au-Sb1-As-Bi-Co-Mo-W-Sn-B-Sb2.The variation tendency of geochemical parameters curves A1 and A2 change from decreasing to rising.At the bottom of No.3 orebody,the texture of primary superimposed halo shows that the tail and front halo are coexisted.In addition,the main ore-forming elements Au has a feature of northwestward lateral trending in the horizontal projection map of primary halos.The above characteristics of primary halos infer a blind orebody may exist below the northwest of the west end of the-60 m level.Using multivariate statistical methods to analyse the trace element,and they can be divided into three categories: ①Au,As,Bi,Cu,Co,Ag,Pb,Zn are ore-forming elements that are closely related to mineralization elements.②W,Sn,Mo,B are high temperature hydrothermal fluid mineralization elements.③Sb,Hg are low temperature hydrothermal fluid mineralization elements.