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  • CN 62-1112/TF 
  • ISSN 1005-2518 
  • Founded in 1988
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Mineral Exploration and Resource Evaluation

Study on the Distribution of Mineral Grades Based on 3D Model:Taking Shaanxi Longtougou Gold Mine as an Example

  • Ming WEI ,
  • Bin ZHAO ,
  • Rui WANG ,
  • Zhenxing PAN ,
  • Liguo CAO
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  • 1. Northwest Nonferrous Geological Mining Group Co. ,Ltd. ,Xi’an 710054,Shaanxi,China
    2. School of Geography and Tourism,Shaanxi Normal University,Xi’an 710062,Shaanxi,China

Received date: 2018-06-15

  Revised date: 2018-12-04

  Online published: 2019-04-30

Abstract

With the continuous integration development of computer technology,three-dimensional modeling technology and geostatistics,the study of geostatistical based on three-dimensional digital model of orebody can reveal the spatial distribution characteristics and mineralization distribution law of orebodies intuitively and accurately,and carry out reserves estimate and dynamic resource management,and effectively guide mineral exploration and development.Longtougou gold deposit discovered in Shaanxi Province is the first gold deposit discovered in the sandstone strata of the south Qinling orogenic belt.It belongs to tectonic altered rock type gold deposit.Based on the existing data,the orebody spatial distribution and mineralization distribution law is analyzed by means of variogram.The specific research process is as follows:Firstly,collect existing topographic survey data,trenching data,drilling sample analysis data and exploration tunnel engineering data,and build a project database with the three-dimensional mining software Micromine as a platform to form a three-dimensional digital model of prospecting engineering.Secondly,combined with geological laws to interpret the profiles,delineate three-dimensional digital model of mineralization domain,and analysis sample data in the mineralized domain model.Thirdly,the block model of mineralization domain is divided according to 7 m×2 m×3 m specification,and the number of sub-blocks is 2×4×3.Fourthly,the variogram fitting is performed on the combined samples in the mineralization domain to determine the variogram structure model and the three-axis direction range.Fifthly,according to the structural law of variation function,the grade of the block model is assigned,so that each block has the grade property of mineralization.The results show that the gold element has a distinct spatial structure,the ratio of strike angle,tendency,and thickness anisotropy are 7.44∶33.37∶1.00.Although the gold mineralization is continuous along the strike,it is mainly low-grade ore continuous,while the high-grade ore has poor continuity.The high-grade industrial orebody in the deep extensional direction is better in continuity than the trend direction,and the high grade mineralization develops,and opens in the east of strike direction.Therefore,the future prospecting should be extended along the eastern side of the orebody and carried out in the deep.The research on the distribution of deposit grade based on the three-dimensional mineralized domain model has certain guiding significance for the exploration and prediction of deposits.

Cite this article

Ming WEI , Bin ZHAO , Rui WANG , Zhenxing PAN , Liguo CAO . Study on the Distribution of Mineral Grades Based on 3D Model:Taking Shaanxi Longtougou Gold Mine as an Example[J]. Gold Science and Technology, 2019 , 27(2) : 172 -180 . DOI: 10.11872/j.issn.1005-2518.2019.02.172

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