Primary Halo Research of the Main Ore Zone in the Huachanggou Gold Deposit in Lüeyang,Shaanxi Province

On the basis of field geological work,the paper analyzes the microelements of the samples of the main ore zone,with the methods of geo-mathematic analysis and the calculation of the primary halo zoning.The result shows that the primary halo axial zoning sequence of ore body Au11 is Hg-Sb-Ni-As-Bi-Cu-Au-Co-Zn-W-Mo-Mn-Pb-Ag-Cd,and the primary halo axial zoning sequence of ore body Au8 is Cu-Co-W-Au-Ni-Sb-Mn-As-Pb-Bi-Hg-Mo-Ag-Zn-Cd.The ideal primary halo axial zoning sequence of the main ore zone is brought forward,which is Sb-As-Cu-Hg(front halo elements)→Au-Ag-Bi-Pb-W(near-ore hole elements)→Ni-Co-Mn-Mo-Zn-Cd(rear halo elements).According to the characteristics of contrast halo zoning of the two ore bodies,the ideal zoning models of the primary superimposed halos are built.In ore body Au11,the front halo is coexistent with the rear halo in 1,150 m middle section,and the rear halo appears obviously in 1,110 m middle section.In ore body Au8,the front halo is coexistent with the rear halo in 1,150 m and 1,070 m middle sections;the near-ore halo is decreased in 1,110 m middle section with ore body thinning and the weakening of the front and the rear halos.According to the results mentioned above,ore body Au11 is extending to the deep part;the underlying part of ore body Au8 is not deep,but there is a new ore body in deep part.