Studies of the effects of outliers and data transformation on variogram estimates for a base metal and a gold ore body |
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| Authors: | Daniel G Krige and Eduardo J Magri |
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| Institution: | (1) Department of Mineral Economics, University of Witwatersrand, Johannesburg, South Africa;(2) Operations Research and Geostatistics Division, Anglo Transvaal Cons. Inv. Co. Ltd, Johannesburg, South Africa |
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| Abstract: | Variograms for gold and lead values from the Loraine and Prieska mines, respectively, indicate that data outliers can seriously distort and/or mask the real variogram patterns. Studies show that this problem is best overcome for these mines by logarithmic transformation of the data, and/or a suitable screening out of such outliers, and/or more robust variogram estimation procedures; the benefits are particularly significant when the basic data is limited. |
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| Keywords: | geostatistics variogram outliers |
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