The handling of the high grade as an outlier on precious metals deposits is crucial in geostatistical ore resources estimation. Ordinary kriging (OK) which is very popular used to estimate the grade of ore resources, is often inaccurate in the handling of the outlier. This paper applied the method of weighted jackknife kriging (WJK) as a practical method to deal with the problem of a high-grade outlier. The simplicity concepts in mathematics and robustness are the attraction of the method in geostatistical ore resources estimation.
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