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最近发表的论文已经证明，充分利用相邻或附近地区已有的有关矿石品位、变化规律和空间分布型式等方面的资料，对改进未开发的或仅有稀疏钻孔控制地区的品位评估精度具有重要的作用。为此，根据从大约30个威特沃特斯兰德型矿山的7条矿脉中收集到的大量采样分析资料和钻孔数据，开展了一项研究项目。本文提出，对于双参数对数正态分布模型来说，“等效”对数方差为研究和比较相对方差的水平和特性提供了良好的基础。已发现这些“等效”对数方差的趋势与相应的对数面积之间可构成某些特殊的相关形式，而这对于这些研究课题来说是很有用的。Basal、Vaal、CarbonLeader和MainReefSeries矿脉的这种相关形式，可归为相当接近的一类。而V.C.R.（尤其是在其工作面交叉处）、BReef和Kimberley－ElsburgReefs（尤其是在狭窄巷道的宽度上）等矿脉则并不总是一致的。根据井下拣块试样数据得出的这种相关形式还与根据钻孔岩心数据得出的结果作了对比。此外，本文还指出了如何利用这些资料来改善新矿山或现有矿山中未开发地段的钻孔评价质量。
Recent papers have demonstrated that taking advantage of the available information on ore grade, variation patterns and spatial distribution patterns in adjacent or nearby areas, there is a need to improve the accuracy of grade assessment in undeveloped or sparsely populated controlled areas Important role. To this end, a research project has been conducted based on a large number of sample analysis data and borehole data collected from seven veins from about 30 Witwatersrand mines. In this paper, we propose that the “equivalent” logarithmic variance provides a good basis for studying and comparing the relative variances with respect to the two-parameter log-normal distribution model. It has been found that the trend of these “equivalent” logarithms of variance and the corresponding logarithmic area may constitute some particular relevant forms which are useful for these research subjects. This related form of Basal, Vaal, CarbonLeader, and MainReefSeries veins can be categorized as fairly close. While V.C.R. (especially at the intersection of its working face), the veins such as BReef and Kimberley-ElsburgReefs (especially in narrow tunnel widths) are not always consistent. This correlation, derived from downhole sample data, is also compared with the results from borehole data. In addition, this article also shows how to use this information to improve the quality of borehole evaluation of undeveloped areas in new or existing mines.