An analysis of the prospecting potential of Pb-Zn-Ag polymetallic deposits in the Liangjiagou-Huoshigou ore district of Zhangjiakou area

Abstract: Carbonate rocks of Meso-Proterozoic and Neo-Proterozoic period are widely distributed along Yanshan fold belt in southern Zhangjiakou and are composed mainly of dolomite. Some polymetallic mineral deposits (ore spots) , such as LaingJiagou, Yingdonggou and Changzhuangzi, are distributed in strata. With the Liangjiagou deposit as a study object, the authors used statistical method and local singularity means to analyze the data of stream sediments (1∶200000) so as to delineate geochemical anomalies. The results show that the areas of geochemical anomalies include three major faults, where there is great potential in search for polymetallic orebodies according to the epigenetic genesis of the ore deposits. The authors adopted densed sampling in important potential areas and delineated three geochemical anomalies. A comprehensive analysis shows that No. 3 anomaly is relatively weak and is consistent with the orebody. No. 1 and No. 2 anomalies not only have high intensity but also possess fairly large areas. The primary halos of bedrock profile survey show that the content of Pb, Zn and Ag in dolomite is significantly higher that in the center of the anomaly area, and this provides further evidence for the prospecting potential of the anomaly area.