3D Geological Modeling And Resource Prospect Assessment Based On GOCAD

3D geological modeling is a technical method using the visual way to describe geological process and phenomenon.It can not only describe the complex topography and geology tectonic conditions,but also can reflect the shape of the geological body occurrence and attribute features,which is the important content of mineral exploration and quantitative geological in current domestic and international studies.According to the geological,geophysical,geochemical,remote sensing and other information of study area,we carried out 3D geological modeling and resource prediction evaluation in ore concentration area,mining area and ore deposit scale based on GOCAD platform in this paper,and obtained research achievements and recognition as follows.(1)From the aspect of ore concentration area,we established the 3D rock mass model of Luanchuan molybdenum,lead and zinc polymetallic deposits in Henan.According to the topographic and geologic map with the scale of 1:50000,the actual geological sections with the scale of 1:2000,some borehole data,the gravity and magnetic inversion information with the scale of 1:25000,we built 3D model of different periods rock mass in study area,which covers an area of 214km2.The results show that the rock mass in Luanchuan ore concentration area are strip shaped output controlled by fault NW and NNE.(2)From the aspect of mining area,we established the 3D geological model of Pulang deposit in Yunnan and Honghai deposit in Xinjiang.According to some data of Pulang copper deposit,like the topographic and geologic map with the scale of 1:10000,the section of transient electromagnetic(TEM),21 geological sections,and data of 77 boreholes,we built 3D model of Pulang copper deposit,which covers an area of 55km2.According to the geological and geologic map with the scale of 1:10000,the geologic and geophysic section with the scale of 1:2000,and the data of 12 boreholes,we built 3D geological model of Honghai study area,which covers an area of 12km2.(3)From the aspect of ore deposit,we acted topography and horizontal with a certain level as constraints,loaded sections and borehole data,and built ore body model of Honghai-Huangtupo area in Xinjiang.The 3D grid grade model about No.I ore body of Pulang copper has been set up according to variogram function and search ellipsoid from borehole assay data of Pulang,ore body grade model from Kriging interpolation algorithm.On this basis,we calculated the total Cu metal in ore body is 1207054t,and the difference is 1.578%with the traditional method on geological blocks.(4)From the aspect of resource prediction assessment,we extracted index of geoanomalies,predicted and assessed 2D and 3D model of Xinjiang Kalatage and Yunnan Pulang based on practical of prospecting data,ore controlling geological analysis,and geophysical anomalies knowledge.This paper shows 3D prediction and assessment can break planar prediction limitation,increase deep information,and promote quantitative prediction for unknown ore body.Summarized all the studies above,we drew a conclusion that the 3D geological modeling technique based on GOCAD was integrated measured geological data of ground surface with deep geophysical information and sparse borehole data,analyzed 3D information,reduced uncertainty of geological information in 3D condition.In conclusion,3D geological modeling of multi-scale based on GOCAD could realize visualization,quantitative and intelligent of multiple sources information such as topography,tectonic,rock mass,ore body,borehole,assay and so on.It also expanded the cognitive level and strategic ability of geological workers for multiple geological information,and provided important technology method and scientific evidence for study area ore body target delimitation and resource quantitative assessment.