Study On Prospecting And Predicting Buried Pb-Zn-Sb Deposit Through The Integrated Geoelectrochemical Technology In Periphery Of The Bancai Prospect,Hechi,Guangxi

The Bancai Pb-Zn-Sb prospective area is located in Jinchengjiang District,Hechi City,Guangxi,and is at 1km north of the Jianzhupo polymetallic deposit in the Wuxu ore field.In recent years,many buried lead,zinc,and antimony mineralization have been discovered.However,due to vegetation coverage,there is no effective technical method for predicting and evaluating the mineralization in the periphery of the Bancai prospect.On the basis of analysis of the regional geological background,this paper selected the A4 exploration sectionwhere Pb-Zn-Sb ore body had been drilledin the Bancaiprospect,and conducted a feasibility test on prospecting buried ores through the integrated technology of electro-geochemistry.The section length is 360 m,and 19 survey points were completed.Areasonableeffect was achieved in the test,sofurther electro-geochemical integrated prospecting predict was increased inperiphery of the Bancai prospect by 100 m × 20 m grid,with 9 survey lines and 464 survey points completed.According to the research results,the background,the lower limit of anomaly and threshold of anomaly zoning of elements and element-assemblageswere analyzed.The electro-geochemical extracted element assemblageswere identified through R-type cluster analysis and R-type factor analysis.Three favorable target of lead,zinc and antimony were selected through multi-level fuzzy analysis.The main achievements of the paper are as follows:(1)The application results of electro-geochemical extraction,soil conductivity,and soil thermal release mercury measurement tests on the A4 exploration section in the studyarea are good.Electro-geochemical extraction can accurately obtain mineralization information in depth of the study area,and soil conductivity and thermal-release mercury methods arewellassistant toelectro-geochemistry.When using the electro-geochemical extraction technology,it is necessary to pay attention to the covariance of anomaly changes in multiple ore-forming elements.(2)Eight elements are extracted by electro-geochemistry in the study area,and the coefficients of variation of Pb,Zn,Sb,Ag,Cd,and Cu are greater than 1,indicating differentiation and potential for mineralization.Especially,the content of Zn,Sb,and Pb varies greatly,and it is believed that the three elements have a high possibility of mineralization and are the main ore-forming elements.(3)R-type cluster analysis and R-type factor analysis are carried out on the extracted elements of electro-geochemistry,and three element assemblages are selected,namely F1 factor(Pb Zn Sb Ag Cd),F2 factor(Co Cu),and F3 factor(Sn).Based on the average and standard deviation of element content,element assembladge contrast,background and anomaly zoning thresholds are calculated to identify the overlapping characteristics of different element anomaly areas and three multi elements anomaly areas are delineated.(4)Based on the multi-level fuzzy comprehensive evaluation method,combined with the ore-forming geological conditions of the study area and the anomaly characteristics extracted by the integrated technology of electro-geochemistry,different levels of elements in the three lead,zinc and antimony anomaly areas are scored by points,and the prospecting target areas are selected.It is believed that the priority levels from high to low are the prospecting target area III,the prospecting target area II,and the prospecting target area I,respectively.The three prospecting target areas are worth further exploration for buried Pb-Zn-Sb mineralization.