Evaluation of skewed exploration data--the nugget effect

Details Evaluation of skewed exploration data--the nugget effect Evaluation of skewed exploration data--the nugget effect

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45.1209i&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 45, Issue 7, pp.1209-1216

Physics

Scientific paper

Histograms of mining exploration data are often skewed, with many low assays and fewer higher values. During evaluation, causes of the skew should be investigated. If it is due to large-scale gradation in the mineral content of the deposit, geostatistical evaluation is indicated. If. however, nugget effects or reduction and subsampling errors are large, geostatistical approaches are at a disadvantage. Nugget effects may arise from a practical impossibility of taking sufficiently large field samples: reduction and subsampling inadequacies may be difficult to detect and overcome during the urgencies of an exploration campaign. Means have been devised to measure variances due to nugget effect and subsampling error and remove them from the data.

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