Research On A Two-way Three-dimensional Quantitative Prediction Method Based On Deep Metallogenic Simulation And Prospecting Model In Jiaojia Gold Metallogenic Belt

With the decrease of shallow deposits,the exploration of blind deep deposits will become the focus of future mineral exploration work.However,as the depth of prospecting increases,there is less and less information about deep mineralization.How to use the limited exploration data to carry out the prediction and evaluation of deep minerals is a problem that we urgently need to solve.For this reason,a two-way forecasting method based on numerical simulation of mineralization process and 3D quantitative predication was proposed.The method uses the way of mutual verification to delineate the prediction target area to improve the reliability of the prediction results,and the application demonstration is carried out in the Jiaojia gold metallogenic belt.The research results are as follows:(1)A complete set of technical methods and procedures on the two-way forecasting method is established.The relevant technical processes,principles and methods of the 3D quantitative prediction and the numerical simulation of metallogenic process of hydrothermal deposits were systematically sorted out,and the technical route of the two-way prediction was established.(2)The numerical simulation method was introduced into mineral prediction.By establishing the numerical simulation model of stress,heat and fluid coupling,the rules of the migration and enrichment of ore-forming fluids under the interaction of stress field and thermal field are discussed,and the parameters of deep mineralization are obtained for the prediction of mineral resources.At present,the pore pressure value(pp value)and volumetric strain rate value(vsr value)in the numerical simulation process have been successfully applied to the prediction of deep minerals.(3)The prediction of the deep blind orebodies in the Jiaojia gold metallogenic belt were carried out by using the method of the two-way prediction,and the predicted targets were delineated by mutual verification.According to the results of numerical simulation,favorable metallogenic range of the PP value and VSR value were quantitatively extracted,and the favorable metallogenic positions were obtained.The weight-of-evidence model and the information-computation model were used in the 3D quantitative prediction of the study area,and the favorable mineralization area was obtained.Finally,using the two results to verify each other,four prospecting prediction targets were delineated in the Jiaojia gold metallogenic belt,including two A-level targets and two B-level targets,with a total predicted gold resource of482.94 tons.(4)Through the study,some new understandings of the metallogenic law of the Jiaojia gold metallogenic belt have been obtained.For example,the rich ore body of the Jiaojia gold metallogenic belt is located on the west side of the turning point of the fault zone,the orebodies in the Jiaojia gold metallogenic belt have equal spacing in three different directions,most gold orebodies are formed in the footwall of the faults,the Jiaojia fault zone and Wangershan fault zone still have great prospecting potential within-1500 m ?-3000 m.