Contribution of auxiliary information for the estimation of grades in heterogeneous media.

N. Jeannée (1), Ch. de Fouquet (2)

(1) Geovariances, 49bis av Franklin Roosevelt, 77212 AVON Cedex, France.
(2) Centre de Géostatistique, Ecole des Mines de Paris, 35 rue Saint-Honoré, 77300 FONTAINEBLEAU Cedex, France.

Abstract

Grade estimates are often of weak precision in the case of heterogeneous media, due to their high variability, even at small scale. Qualitative information is then useful to improve the quality of the estimates, without prohibitive additional costs.

How can we sample such variables, and detect the ones that are of interest for the estimation of grades? The general methodology is presented and then illustrated for the estimation of the benzo(a)pyren (a polycyclic aromatic hydrocarbon, PAH) concentration in soils, sampled on a former coking plant.

C. R. Geoscience 335 (2003).

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