Soil Geochemical Anomalies And Ore - Prospecting Prediction In Nandan Lead - Zinc Mining Area,

Guangxi Nandan Najin lead-zinc deposit located in Danchi metallogenic belt, the west side of the Dachang tin polymetallic metallogenic belt. The paper based on the analysis of related data, through geological exploration, soil samples collection, chemical analysis, that Najin mining area soil element geochemical anomaly characteristics are summarized. According to the recent geological characteristics of anomaly interpretation, and make a mine prospecting prediction.Make analysis for 13 elements collected from the Najin mining area soil of basic statistical,found that the secondary enrichment tendency is obvious elements Cu,Sn,As, Sb, Bi, Cd,W element is relatively depleted; mining area soil elements Cd, Mo, Ag, Au are not evenly distributed, showing a characteristics that have strong divided.According to the characters of Najin mine soil single element anomalies, can draw the following conclusions:soil element anomalies in a large number of Hg, Cd, Mo, Ag, Bi, the abnormal number can reach more than 50, and abnormal concentration zoning is not uniform; elements Pb, W, Au anomaly size largerly, Ag, Zn, As and Sb elements reached level 3 concentration zoning, Ag, Cu, Pb, Zn, Sn, W, As, Hg, Sb, Bi element secondary halo set is better.It provides the main basis for delineating ore prospecting area, which are researched association characteristics of soil geochemical elements and the comprehensive element anomaly graph using multivariate statistical analysis. Through correlation analysis showed:there are remarkable correlation among Cu、Zn、 Pb、Sb、Bi、Cd and As. Through cluster analysis showed:Pb、Ag、Zn、Cd、Sb、 B、Sn and As is a kind of middle-low temperature elements combination, is also the main ore-forming elements in the supergene environment secondary enrichment combination. Through factor analysis showed:F1 factor (Cu、Pb、W、Bi) is a combination of most important secondary enrichment elements; F2 factor(Z、As、 Cd、Sb)is a combination the relatively minor secondary enrichment element. Compared correlation analysis with cluster analysis and factor analysis, obtained two important types of element combinations in study area, Cu、Pb、W、Bi is the most important ore-forming elements combination, Zn、As、Cd、Sb is relatively minor ore-forming elements combination in study area.Through multivariate statistical analysis showed that Najin ore prospecting indicator elements for Cu, Pb, W, Bi, Zn, As elements elements, Cd, Sb, Au, Ag elements combination.The application of MAPGIS make the element anomaly in the mining area, the results show that:Pb, W, Cu, Bi elements combination, elements Zn, As, Cd, Sb combination and single element anomaly comparison.Using ANSYS software to simulate the Najin area should be characteristics of stress and strain, found in the mining area of stress concentration area mainly distributed in both sides of the fault and intersection part and has a good developmental condition of the fractures, can be used as the prospecting marks.According to the characters of Najin mining area soil element anomalies, mining area geological features, the delineation of the ore-prospecting, providing reference for the next step.