Geostatistical case studies of the advantages of lognormal-de Wijsian kriging with mean for a base metal mine and a gold mine |
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Authors: | Daniel G Krige and Eduardo J Magri |
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Institution: | (1) Dept. of Mineral Economics, University of the Witwatersrand, Johannesburg, South Africa;(2) Operations Research and Geostatistics Division, Anglo Transvaal Cons. Inv. Co. Ltd., Johannesburg, South Africa |
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Abstract: | Parallel variogram analyses, block kriging, and follow-up studies were effected for the lead content of part of the Prieska copper-zinc ore body and for the gold content of the highly variable Breef in a section of the Loraine gold mine, based first on untransformed values and second on logarithmically transformed values using the lognormal-de Wijsian model. For both models the effect was also analyzed of using the population mean or ignoring it. Practical follow-up comparisons confirm theoretical considerations and show that on these mines conditional biases can be eliminated conveniently by kriging with mean; also that the lognormal-de Wijsian model with mean gives the best results. |
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Keywords: | geostatistics kriging |
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