3D characteristics of primary halo and deep prospecting prediction in the Zaozigou gold deposit, Hezuo City, Gansu Province

In order to evaluate the prospecting potential and direction in the depth of the Zaozigou gold deposit, the authors selected 61 drill holes in the Zaozigou gold deposit as the research objects, conducted multivariate statistical analysis and 3D spatial distribution characteristics study of the primary halo data along No.70 exploration line with thick orebodies exposed.The results are as follows:① Correlation analysis and cluster analysis indicate that the elements most closely related to Au are As and Ag.② The morphological characteristics and spatial distribution characteristics of the primary halo show that the ore- and halos- forming elements exhibit a clear zonation.The primary halo is characterized by the front halo elements of As, Sb, Hg, the near-ore halo elements of Au, Ag, Cu, Pb, Zn and the rear halo elements of W, Mo, Bi.③ Based on the 3D interpolation analysis of the primary halo data, a 3D model of each element primary halo in the Zaozigou gold deposit was constructed.The anomaly model of indicator elements such as Au, As, Ag and the anomaly accumulation ratio of As+Sb/Au+Ag show that the anomaly scale is small when the anomaly is shallower than 2500 meters.In the depths greater then 2500 meters, the anomaly scale seems to be larger and larger toward the depth, and the extension is stable.Combined with the spatial distribution characteristics of anomaly elements, it is proposed that the place along No.78 line-No.85 exploration line of the Zaozigou gold deposit still has great prospecting potential in the depths greater than 2000 m.