多重指示克里格法在坦桑尼亚某金矿床储量估算中的应用

运用地质三维建模软件建立坦桑尼亚某金矿三维地质模型,并结合地质统计学基本原理建立块体模型完成了储量估算,为矿山的勘探计划及采矿实施提供理论指导和数据支持。建立该金矿床历史勘探数据地质数据库、局部地表模型与矿化体三维模型,实现矿区在三维立体空间内地质数据的复建;基于地质统计学基本原理,完成了对钻孔内样品的组合计算,对按同等长度组合样品进行统计分析,以为多重指示克里格异常值处理提供依据,并确定用于多重指示克里格分域分析的一系列阈值边界品位;完成对块体尺寸、估值最大以及单孔最大样品数、搜索半径等参数优化;利用多重指示克里格法,对块体模型进行品位估值,并最终得到主要矿化体的储量赋存情况和相关统计报告。与传统地质块段法、距离幂次反比法、普通克里格方法进行对比的结果表明,参数修正后的多重指示克里格估值准确度得到进一步提高,矿体品位估算工作优化圆满完成。

Application of Multiple Indicator Kriging for gold mine resource estimation in Tanzania

3D software was used to establish the 3D geological models of Tanzania gold deposit in this paper, and geostatistics was applied to estimation of block model, and provide referrences and data support for future exploration and mining activities. Geological database of the deposit, topographical DTM, geological models were set up, 3D space was recreated for storing all related geology data. Based on geostatistics, exploration samples were composited and statistically analyzed which provided the basis to determine the setting of cut-off grades for multiple indicator Kriging method. After all parameters including block size, search distance and estimation samples were upgraded, related attributes were estimated by multiple indicator kriging. Comparing to the traditional block method, IDW method, Ordinary Kriging method results, the MIK method with adjusted parameters optimize resource estimation results with higher accuracy.