Abstract: The regional geological background and geochemcial background of Jiasi PbZnCu mining area are discussed,besides that,the metallogenic geological conditions and geochemical characteristics of the mining area are analyzed in detail.Based on the analysis of the 1〖DK(〗∶〖DK)〗200 000 and 1〖DK(〗∶〖DK)〗50 000 stream sediment measurement data of the mining area,the comprehensive anomalies mainly for the elements of Cu,Pb,Zn and Ag of the mining area are delineated by using 1〖DK(〗∶〖DK)〗25 000 geochemical measurement method of secondary halo in gully system.The geochemical characteristics and correlation characteristics of the secondary halo in gully system are analyzed,it is show that in terms of the elements of Pb,Zn,Cu and Ag,the contents of them are higher than others,the variable coefficients of them are also larger than others,and the local enrichment characteristics is significant,they are can be regarded as the main metallogenic elements and mineralized associated elements,besides that,H3#and H4#comprehensive anomalies are both with the characteristics of relative large size and high peak value,and the concentration centers and concentration zoing characteristics of them are both obvious,they are located at the Yangye copper metallogenic belt,which metallogenic conditions are similar with the one of garden type sandstone type copper deposit,the comprehensive analysis results show that H3#and H4#comprehensive anomalies can be taken as the favorable prospecting anomaly areas of garden type sandstone type copper deposit.The surface engineering revealed show that Ⅰ# copper orebody is found in H4# comprehensive anomaly,Ⅱ# copper 〖CM42-107〗 mineralization body is found in the west of H3# comprehensive anomaly,which further indicated that the 〖LM〗prospecting potential of the mining area is good.Based on the geochemical characteristics of secondary halo in gully system and the geological environment of the mining area,the prospecting directions of the mining area are also discussed,so as to provide some reliable reference for further conducting the prospecting and exploration works of PbZnCu deposit in the mining area.

Key words: PbZnCu deposit, Secondary halo in gully system, Geochemical anomaly characteristics, Sandstone type copper deposit, Anomaly verification, Prospecting direction