3D Geological Modeling And Geological Metallogenic Analysis In The Liqingdi Ag Polymetallic Deposit,Inner Mongolia

Liqingdi Ag Polymetallic Mine is located 12 km south-west of Ulanchabu City,Inner Mongolia Autonomous Region.The mining area has a long history and the surface is covered with ancient mining pits.In this paper,the southern ore belt of Li Qingdi silver polymetallic deposit is taken as the research object,and a large number of basic geological exploration data have been collected and sorted out through field survey and indoor collection.In this study,Surpac three-dimensional geological software is used as the main mapping software,Mapgis and CAD as auxiliary software,using known borehole data,the geological database of the whole South Mining Zone is established,and the three-dimensional geological model of the surface,strata,magmatic rocks,faults,orebodies and altered rocks is established by using topographic maps and exploration profiles of the mining area.The three-dimensional model shows that the terrain of the study area is not very undulating and the gradient is gentle and the height difference is small;the ore bodies qv1 and qv2 are lenticular and lentil-shaped,occurring in marble and sandwiched in two groups of diorite and gneiss;the fault shape is simple,the lower part is steeper than the upper part,and does not destroy the ore bodies,but provides an ascending passage for ore bodies and serpentinized marble and gneiss;and the ore bodies and serpentinized marble and the serpentinized marble Ferromanganese mineralized marble is closely related,and the latter can be used as a prospecting indicator.In the overall study of the metallogenic characteristics of Liqingdi mining area,it is concluded that the northern part of the mining area is dominated by Pb,Zn,Au and Cu orebodies,while the southern part is dominated by Pb and Zn orebodies with a small amount of Ag deposits;the southern ore belt is dominated by Ag and Mn deposits,and the Pb and Zn deposits are minor associated.From the point of view of metallogenic series research,the characteristics of such metallogenic assemblage conform to the subvolcanic hydrothermal related type deposits.Based on the regional geological conditions,it is further deduced that the hydrothermal fluid originated from the volcanic structure of Naobaoshan in the northern part of the mining area,and its flow path is obvious.Combining with the ore-forming dike marble and prospecting indicative altered dike,the analysis is made.Three metallogenic target areas have been optimized: prediction area I is located on the east side of the known orebody,grade I;prediction area II is located on the west side of the known orebody,grade II B;prediction area III is located on the southwest side of the known orebody,grade II A.Finally,this paper makes an uncertainty analysis on the genetic model,threedimensional geological modeling and prediction and evaluation of the deposit.