3D Geological Modeling And Metallogenic Prognosis In The Yangshan Gold Belt, West Qinling, Central China

Yangshan gold belt is a super large gold deposit discovered in recent years in the West Qinling Mountains gold belt.However,its proven resources are mainly concentrated on the 1500 m elevation above the anba Ge Tiao Bay.There is always controversy about its metallogenic regularity and prospecting direction.Through three-dimensional geological modeling,we can intuitively display the spatial distribution characteristics of plastids and their relationships,so as to accurately define metallogenic regularities and locate prediction,which is the research frontiers and development trend of metallogenic prognosis.The system of collection and processing of basic geology,geophysical exploration,geochemical exploration,remote sensing,surface DTM,drilling,tunnels and other information in the study area,established the Yangshan gold belt of geological database,build the three-dimensional geological model of Yangshan gold belt and anba ore block by using MicroMine software.Results show that the gold deposit mainly is NEE to the vein distribution,extending along the strike ends gradually thinning,local expansion clamp shrinkage characteristics significantly;the ore body has obvious spacing distribution(spacing between 70 ~ 300m),single vein pinch reproduction has obvious characteristics,the overall northward plunging trend.Study on the relationship between the ore bodies and other geologic body show that the ore bodies are mainly controlled by the NEE fault zone(F1,F2,F3)control and the secondary fault,tectonic movement,multi period superposition of different nature,caused by the discontinuity distribution of ore bodies in the direction and tendency.On the basis of the above studies,the metallogenic prediction of Yangshan gold belt is carried out by means of integrated information integration,cube block model and superposition halo anomaly.It is found that the ore bodies mainly occur in the abnormal low high resistivity transition zone of geophysical exploration and have good metallogenic conditions in the deep part of the CAMST section.There are two prospecting areas in the Tang-Bu Gou Gou and Gao Lou Shan.The study of structural superimposed halos in Yangshan gold belt shows that the element combination of near ore haloes is Au-Ag(-Cu)-Pb,the halo halo element combination is As-Sb-Hg,and the halo halo element combination is Bi-Co.To determine the sign of a prediction of blind orebodies in Ge Bay ore section,the delineation of 5 deep ore prospecting target area: predicting target area of deep 1550~1650 meters in elevation,No.38 exploration line elevation 1320~1420 meters deep,the target area No.44 exploration line elevation target deep No.30 exploration line respectively for the target area deep 1450~1550 meters and 1200~1270 meters,1500~1600 meters in elevation of No.26 exploration line.The establishment of the dam of mine 3D block model,Lsb,Ph+Lsb,Fz delta extraction(Ph+Lsb),Fz(Ph+Ssb),Delta Ph,the main fracture and secondary fracture zone,As and Sb anomalies as prospecting variables,estimate each block prospecting information,the delineation of 4 deep prospecting target area: 11~17 lines between exploration target area elevation of 1270~1470 meters,04 ~ 12 exploration line between the elevation of the target area is respectively 1110~1250 meters and 1670~1850,14 on the west side of the line elevation exploration target area 1610~1830 meters.The second target area is verified by drilling.It is found that 3 fault fracture zones and 1 gold deposits(apparent thickness 3.46 meters,average grade 1.2g/t),prove the validity of 3D geological modeling and metallogenic prognosis,and provide technical support for prospecting deployment.