Diamond Drill Holes, Blast Holes and Cokriging

Abstract : This paper is a geostatistical study of diamond drill holes and blast holes and their potential use together in a cokriging system. Both measurements of a real copper deposit are formally compared, leading to a model where a blast hole can be considered as a regularization of the drill information up to a nugget effect characteristic of the blasts. This formal link makes it possible to build a cokriging system that accounts for the different supports and leads to a block model based on blast and drill holes. The model is tested on a realistic simulation where the true block grades, which are known, are compared to their estimate obtained by: - Kriging using only drill holes; - Kriging using only blast holes; - Cokriging using drill and blast holes together. The first conclusion is that the best estimate is obtained when only blasts or blast and drill holes are used together, there is no significant difference, there are too many blasts. This justifies the usual practice consisting in basing the short-term planning on blasts only. But another conclusion appears when kriging is compared to moving average (another common practice), both based on blasts: depending on the number of data used in the neighborhood, the moving average produces a strong conditional bias, a useful reminder of the reason why Kriging was created more than fifty years ago.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01307095
Contributeur : Serge Antoine Séguret <>
Soumis le : mardi 26 avril 2016 - 11:30:57
Dernière modification le : lundi 12 novembre 2018 - 11:00:13

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  • HAL Id : hal-01307095, version 1

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Serge Antoine Séguret, Sebastian de la Fuente. Diamond Drill Holes, Blast Holes and Cokriging. 4th International Seminar on Geology for the Mining Industry - 8-10 July 2015 - Antofagasta Chili, Gecamin, Jul 2015, Antofagasta, Chile. ⟨hal-01307095⟩

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