Quantitative Prediction And Comprehensive Evaluation Of Cu?Au Polymetallic Of Golmud Hexi Area

Results based on “ 1:50000 geological mine survery of multivariate geological informat-ion integration and target optimization in hexi region of Golmud in Qing Hai province” show that there are many Mineral rights,minerals and kinds of work.But no finding the larger copper gold polymetallic deposit is a big problem.As for the status quo,using the fuzzy weights of evidence method is for studying such as copper,gold polymetallic deposit in comprehensive metallogenic prediction by fully tapping the ore-forming geological information and making full use of them.The causes of the two deposits were established after the analysis of the mineralization rules of the region copper and gold deposit and the study of the typical copper gold deposits and mineral deposits in the region:one is medium and low temperature hydrothermal copper deposit,the other is alteration rock type gold deposit.The former metallogenic prediction mode contains mineralized alteration zone layer,NW-SE to fracture layer,granite rock contact zone layer,favorable metallogenic space(ho wan bao groove group of volcanic rock group,the Cambrian sand-pine group,red machine group of clastic lava,the Triassic chang landmark group strata contact zone)layer,the forecast of aeromagnetic layer.The latter contains the same metallogenic prediction layer except red machine group of clastic lava.The prediction results of low temperature and medium temperature hydrothermal copper deposits are divided into two types by two genesis.One is medium and low temperature hydrothermal type,the other is medium and low temperature hydrothermal-shear zone type.There is no obvious influence on the mineralization of the ore in the middle acid granite but the lack of favorable ore space has a great influence on the formation of copper ore.The prediction results of the altered rock type gold deposit are shown that in the first 10% of the prediction area,the prediction result of the mineralized alteration zone is the worst,and the genetic type of gold deposit is the alteration rock type;When predicting area greater than 10%,each layer importance of size of evidence: mineralized alteration zone layer > favourable metallogenic space layer > NW-SE to fault contact zone layer > granite rock layer > aeromagnetic anomalies layer.Five copper metallogenic prospective areas and five gold metallogenic prospect areas are circled by the established metallogenic prediction model of copper and gold polymetallic deposit,the basis of combination with copper gold metallogenic regularities,the study of copper gold metallogenic conditions in the study area and the calculation results of the known mines copper and gold mine favorable degrees distribution relations.The further exploration of mineral exploration can refer to the results.