基于DIMINE的会理拉拉铜矿三维地质建模及储量估算

为较准确地估算出会理拉拉铜矿床资源储量,首先结合已收集的矿区地质勘探及生产勘探数据,建立了矿区完整的地质数据库;其次,为弥补传统二维研究方法无法完整表达地质体空间产出特征的缺陷,根据地质数据库对矿体进行了圈定,利用DIMINE软件的地质模块构建了拉拉矿区完整的地层实体模型及矿体实体模型;然后以矿体三维实体模型为约束,利用距离幂次反比法对Cu、Fe品位进行了赋值,建立了矿体品位模型;最后采用普通克里格法对资源储量进行了估算,得出矿石量约6 435.01万t,Cu金属量约56.9万t,Cu平均品位0.885%,Fe金属量约848.2万t,Fe平均品位13.182%。选择典型矿体作为校验矿体,分别采用垂直断面法与普通克里格法进行了对比分析,结果表明:Cu、Fe品位的相对误差分别为-1.842%、-4.072%,Cu、Fe金属量相对误差分别为-5.4%、-7.797%,相对误差均控制在±10%以内,对于高效开发利用该矿床资源有一定的参考价值。

Three-dimensional Geological Modeling and Reserves Estimation of Lala Copper Deposit in Huili County,Based on DIMINE Software

In order to estimate the resources reserves of the deposit accurately,firstly,the integrated geological database of the mining area is established by adopting the geological prospecting data and production prospecting data that are collected in the Lala mining area;then,the three-dimensional space output characteristics can be can be expressed effectively by the tra-ditional two-dimensional study method,so,in order to remedy the defaults of the two-dimensional study methods,the ore-bodies of the Lala mining area are delineated by adopting the established geological database,the integrated stratum entity model and ore-body entity model of the Lala mining area are established by adopting the geological module of DIMINE software;thirdly, taking the three-dimensional ore-bodies entity model as the constraints,the grade of Cu,Fe are assigned by adopting the dis-tance power inverse ratio method,and the ore-body grade model is also established;finally,the resource reverses is estimated by adopting ordinary kriging method,the results show that the ore reserves is 64. 3501 million t,the metal quantity of Cu is 0. 569 million t and the average grade of Cu is 8. 482,the metal quantity of Fe is 8. 482 million t and the average grade of Fe is 13. 182%. The typical ore-bodies are selected as the verify ore-bodies,the comparison analysis of the resources reserves and grade estimation results of vertical selection method and ordinary kriging method,the results show that the grade relative error of Cu and Fe are -1. 842%、-4. 072% respectively,the relative error of metal quantity of Cu and Fe are -5. 4%、-7. 797%, the above relative errors are lower than ±10%,therefore,it show that the three-dimensional modeling and reserves estimation results of Lala copper deposit in Huili county with high precise,the analysis results of the paper can provide some results for the effective development and utilization of the Lala copper deposit in Huili county.