资源量估算的边界分析与矿化体圈定

Boundary Analysis and Delineation of Mineral Resource Estimate Domains

资源量估算总是在特定的估算域中进行,其边界条件对估值结果有着显著的影响。传统方法采取用工业指标来圈定矿体并进行资源量估算的硬边界条件,过于强调了矿床的经济性,而对矿床的地质和地质统计学规律重视不够。本文介绍了国际上流行的资源量估算域的相关概念及边界分析方法,并通过实际案例来探讨其在资源量估算中的应用,在此基础上提出了利用三维软件进行矿(化)体圈定的基本原则。实践表明,利用软边界约束或圈定矿化体进行品位估计,可能更符合勘查阶段资源量估算的要求,进而降低估算域边界的不确定性带来的估值风险。

Mineral resource estimation is usually carried out in specific estimate domains, and the boundary conditions of these domains have a signifi- cant effect on the evaluation results. The traditional method adopts the hard boundary condition that uses the industrial indicators to delineate ore body and performs subsequent estimation. This traditional way of estimation places emphasis too much on the economy of the deposit but attaches less importance to the geological and geostatistical features of the deposit. This paper introduces the concepts of mineral resource estimate domains and the boundary analysis methods and discusses their application in the estimation of resource through practical cases. On this basis, the basic principle to use three-dimensional software to delineate the estimate domains is proposed. The practices show that the using soft boundary constraints or delineation of mineralization domains for grade estimation may be more in line with the requirements of the estimation of mineral resources in the early exploration stage, thus reducing the valua- tion risk of boundary uncertainty of estimate domains.