云南蒙自市白牛厂银多金属矿区白羊矿段三维地质建模及资源储量估算

Three-dimensional geological modeling and resource reserve estimation of Baiyang ore block in Bainiuchang Ag-polymetallic deposit, Mengzi, Yunnan

云南白牛厂银多金属矿床位于云南省蒙自市老寨乡,是我国为数不多的已探明储量的超大型银多金属矿床。基于3DMine数字矿山软件系统,建立了矿区白羊矿段钻探工程、地表DTM、断层以及矿体模型,实现了地质信息的三维可视化,为矿山地下开采和设计提供了基础平台。在地质统计学原理和矿体模型的基础上,创建了块段模型,使用距离幂次反比法和普通克里格法对白羊矿段矿体的储量进行了估算。并将估值结果与矿山实际情况进行对比研究,分析了误差的原因,对估值方法进行了取舍。结果表明:使用普通克里格法对Pb与Zn元素进行估值更加接近真实值,但对于Ag与Sn这两种伴生且品位分布不均的元素并不适合,通过对比并结合矿区实际情况,认为需要将两种方法结合起来,从而得到更为合理的估值结果。

The Bainiuchang Ag-polymetallic deposit is located in Laozhai Township, Mengzi City, Yunnan Province. It is one of the few super-large silver polymetallic deposits that have been proved in China. Based on the 3DMine digital mine software system, this paper establishes the models of drilling holes, surface DTM, fault and orebody in Baiyang ore block, realizes the three-dimensional visualization of geological information, and provides a basic platform for underground mining and design. Based on the principle of geostatistics and orebody model, a block model is established, and the reserves of orebody in Baiyang ore block are estimated by inverse distance power method and ordinary Kriging method. The estimation result is compared with the actual computation reserves of the mine, the cause of the error is analyzed, and the valuation method is chosen. The results show that Pb and Zn element reserves evaluated by ordinary Kriging are closer to the actual reserves, but it is not suitable for Ag and Sn, because of their uneven grade distribution. Through comparison and combined with the actual situation of the mining area, it is considered that it is necessary to use the two methods in order to get more reasonable valuation results.