Three-dimensional Geological Modeling And Ore-prospecting Prediction Of Bojitian 2 Ore Block In Shuiyindong Gold Mine Area,Southwestern Guizhou Based On Surpac

Southwest Guizhou is one of the most important gold producing areas in China,which controls the Huijiabao gold field.This area is an important base for gold exploration,exploration,prospecting and scientific research.The Bojitian 2 gold deposit is an important part of the Shuiyindong large gold deposit,located in the northeast direction of the Huijiabao anticline,and the high point of the Huijiabao anticline is near the Zaofan Mountain.Its two wings are slow in occurrence and simple in structure.Significant progress has been made in the pre-survey and follow-up survey in 2011,which effectively controlled the orebody of Shuiyindong gold deposit and achieved remarkable prospecting results.However,it is still an unknown field to study the 3D geological model of the gold mine and the stereolocation prediction of the ore body.This paper aims to study the ore-controlling structure,3D geological model and ore-body spatial prediction of Bojitian 2 ore member of Shuiyindong Gold mining Area by relying on the geological survey project of China Geological Survey"Investigation and Prospecting Prediction of Ore Field Structure in Youjiang Ore-forming Belt of Sn-Au Polymetallic"Mineral-concentrated Area"（No.DD20190161）.Based on the abundant prospecting engineering data,Surpac software is used to establish the surface model,solid model,block model and grade model of the Dujitian 2 ore section.Combined with the three-dimensional spatial change analysis of the elevation,thickness and strength of the ore body,and the comprehensive system analysis of the ore prospecting information method,the ore prospecting in the study area is predicted.The main achievements of this research are as follows:1.Based on the requirements of Surpac platform,the 3D geological database of the Bojitian 2 ore member is established,which lays a favorable foundation for the construction of 3D solid model,block model and grade model.2.Surpac software is used to construct a complete surface model,solid model,block model and grade model of Bojitian 2 ore block.By analyzing the relationship between the fault solid model,stratum solid model,anticline solid model,structural corrosion variant and orebody of the Bojitian 2 ore section,the 3D positioning status of orebody and fault,stratum,anticline and structural corrosion variant is directly displayed,and the specific guiding significance of fault,stratum,anticline and structural corrosion variant to the formation of the deposit is revealed.3.Through the analysis of the spatial variation chart of the thickness of the ore body,it can be seen that the thickness of the ore body is basically stable,and the strong thickness area is concentrated in the elevation range of 750m,and the east coordinate of the control is559500m to 560000m.The thickness of the ore body is mainly distributed along the east-west direction with discontinuous characteristics.Based on the analysis of gold grade thickness contour map,the ore bodies are mainly distributed in the elevation between 500m and 1000m,and there is no obvious deep extension trend.4.According to the information content method,the information value of five prospecting factors,namely P₃l³in the third member of Longtan Formation,P₃l²in the second member of Longtan Formation,fault F₁₀₃,anticline and structural erosion variant,is high,which indicates that they have guiding significance to the formation of ore deposits in the study area.According to the information critical value and prospecting potential,a favorable prospecting area is delineated:the elevation is about 550m,the east coordinate of control is559000m to 560000m,and the north coordinate of control is 2825000m to 2825500m.Combined with the geological data of the previous study area,the ore body at 550m elevation is located in the southwest of the intersection of F₁₀₉fault and F₁₀₁fault,and is located in the southern wing of the Huijiabao anticline.Due to the existence of faults（faults are the channels for the movement and migration of mineral fluid）,it is speculated that there are layered ore bodies at the elevation of about 550m.Finally,the three-dimensional location and quantitative prospecting prediction of Bojitian 2 ore block are realized.