基于三维模型的矿床品位分布规律研究——以陕西龙头沟金矿为例

以陕西龙头沟金矿为例，通过收集矿山已有的勘查和生产数据，选用Micromine软件平台，并采用普通克里格方法进行插值，建立了矿床的品位矿块模型。在总结矿床地质特征的基础上，从矿化域变异函数拟合参数、矿块模型三维展布及品位分布特征等方面，分析了龙头沟金矿床品位空间分布规律。结果表明：龙头沟金矿床低品位矿基本连续，而高品位矿连续性差；高品位工业矿体在深部倾向延伸方向的连续性好于走向方向。矿化带在55线以东走向延伸和深部倾向延伸均未封闭，且临近EW向与NW向构造交会部位，具有较好的找矿前景，可作为下一步工作靶区。

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

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.