Mineralization Enrichment Law And Deep-margin Prospecting Prediction Of Guanfang Copper Mine In Yunna

Guanfang Copper deposit is located in the north member of the South Lancang volcanic rock section of the famous Sanjiang metallogenic belt.It belongs to the Yunxian-Jinggu（volcanic arc）copper polymetallic metallogenic belt.It is a copper deposit occurring in basalt strata with medium-scale reserves.On the basis of field investigation,underground investigation and indoor work in Guanfang copper deposit,the paper discusses the genesis of Guanfang copper deposit.The three-dimensional visualization of the ore body in Xiangyangshan section is realized.The spatial characteristics of the orebody in Guanfang copper deposit are systematically studied.The enrichment law of copper element is analyzed according to the strike direction,dip direction and vertical direction of ore body.The ore prospecting prospect of different ore bodies（groups）is evaluated and the target area is delineated.The main knowledge and achievements of this paper are as follows:1.The ore bodies of Guanfangcopper mine are produced in the Upper Triassic Xiaodingxi Formation（T₃x）stomatal almond basalt and brecciform basalt.Controlled by fracture zone and lithology,the ore bodies are mostly stratified,stratified,lenticular and vein-like,and can be divided into 5 ore bodies（groups）according to their spatial distribution characteristics.Based on the multivariate statistical analysis of trace elements in rock and ore samples and the summary of the results of isotope geochemistry and fluid inclusions,it is concluded that Guanfang copper deposit is a shallow medium-low temperature hydrothermal deposit which occurs in basalt strata and is controlled by fault and lithology.3.Based on the orebody model,joint mid-section map and joint section map,the spatial variation characteristics of orebody are summarized.It includes the quasi-proportional characteristics of the shape of the orebody,the quasi-equidistant distribution law of the orebody,the expansion and contraction law of the orebody,and the lateral law of the orebody.4.Based on the grade model,the isoline map of copper element grade is drawn from the trend,tendency and vertical direction of the orebody,and the law of element enrichment is summarized,which provides a basis for ore prospecting prediction.5.Through the study of the spatial variation law of orebody and the law of element enrichment,combined with the layout of mine exploration engineering,the prospecting prospects of each mineralization zone are evaluated respectively:it is considered that theⅡ-1 orebody of theⅡmineralization zone and theⅢ-3 orebody of theⅢmineralization zone have a good prospecting prospect;the orebodies IV-2 and IV-3 of the IV mineralization zone and the orebodies at the edge of the V mineralization zone have good prospecting prospects.The I-1 orebody in the No.1 mineralization belt has little prospecting prospect in the deep.Four prospecting targets are circled,including 2A-level targets,1 B-level targets and 1 C-level targets.