3D Geological Modeling And Prospecting Prediction Of The Matigou Gold Deposit In Feng County,West Qinling

The West Qinling Matigou gold deposit is located in the north of Feng County,Baoji City.It is located in the north of Fengxian-Taibai Mine,one of the most important gold prospecting areas in western China,and the east of Lixian-Taibai Mine in West Qinling.The mineral deposits in the area are densely covered and the mineralization is strong.Many gold deposits have been discovered,such as Shuangwang,Liba and Bagua Temple.In recent years,some researches have been made on the Mazuogou gold deposit in this area.However,the three-dimensional geological research on the Mahoogou gold deposit is lacking,and the research on three-dimensional spatial prediction is rarely involved.This paper is based on the project of"Integration and Technical Support for Exploration Results of Typical Ore Belts in Qinling Metallogenic Belt"from Shaanxi Institute of Geological Survey and projects of"Survey of Matigou gold deposit in Fengxian County,Shaanxi Province"by Zhongshan Nuclear Industry 211 Brigade Co.,Ltd.and Shaanxi Geological and Mineral Third Geological Team.The author conducted data collection and collation in the area,field routes,borehole core investigation and research,etc.The Surface Model,Stratigraphic Solid Model,Fault Solid Model,Altered Solid Model,Ore Body Model,Block Model and Taste Model of the Horseshoe Gully Gold Mining Area were established by using Surpac 3D geological modeling software.Using the prospecting information method,the Shenshen Department has made predictions and obtained certain research results and understanding:?1?According to the traditional two-dimensional planar geological data analysis of the Matigou gold deposit,according to the Surpac software format requirements,three geological databases of the Matigou gold deposit were established,which are the subsequent physical model,block model and grade model.Establishing the provision of basic guarantees provides a strong basis for later mining;?2?The surface model of the Matigou gold deposit was established according to the contour line.The DTM of the Matigou gold deposit was established by the function of“cutting DTM with line”,and the three-dimensional visual display of the ground surface outcrop was realized.?3?Through the formation solid model,fault solid model,altered solid model and ore body model,it is possible to visually display the shape and distribution of ore bodies,strata,faults and alteration zones in real three-dimensional space.Characteristics and laws reveal that the main ore-bearing strata are the clastic rock section of the Luohansi rock group?Pz₁L^c?;the tough and brittle thrust nappe fault?F9?of the Luohansi-Waiyao and its derivative and evolutionary structure are the main control areas of the mining area.Ore structure;the altered relationship between the altered zone and the ore body is very close,and it is one of the favorable elements of mineralization.?4?Based on the scope of the deposit,the block model and corresponding constraints are established.The power level inverse ratio method is used to estimate the gold grade with the ore body model as the constraint condition,and the horseshoe gold grade model is established,and the reserves report is generated.Automate the generation of reserve report generation.Through the reserves report to the distribution curve of the gold deposits in each middle section,it is analyzed that the middle section of the 1450-1550m gold reserves is the most,more than 20t,which is a favorable range of metallogenic conditions.?5?By deriving the coordinates of each block and the gold grade,the gold grade projections of the X-Y plane,the X-Z cross section and the Y-Z longitudinal section are drawn.It is concluded that the gold grade change of the Matigou gold deposit mainly extends along the NW-SE.At the elevation,the mineralization intensity has a tendency to decrease from high to low,showing discontinuous characteristics,and mineralization tends to extend deep.?6?Based on the established block model,the prospecting method is used to predict the deep prospecting of the Matigou gold deposit.According to the subjective probability method,when the critical value of the ore-seeking information is greater than or equal to 1.2,the identified favorable ore-bearing blocks contain42167 known ore bodies,accounting for 43.26%of the known ore bodies;The mine evaluation probability is 43.26%.The distribution of the ore information with a quantity of more than 1.8 is related to the three-dimensional relationship between the ore bodies.It can be seen that the two have a high degree of agreement,which is similar to the actual situation and has a good prediction effect.