Predictive Geological Mapping Using Closed-Form Non-stationary Covariance Functions with Locally Varying Anisotropy: Case Study at El Teniente Mine (Chile)

Abstract : This paper is concerned with the problem of predicting the surface elevation of the Braden breccia pipe at the El Teniente mine in Chile. This mine is one of the worlds largest and most complex porphyry-copper ore systems. As the pipe surface constitutes the limit of the deposit and the mining operation, predicting it accurately is important. The problem is tackled by applying a geostatistical approach based on closed-form non-stationary covariance functions with locally varying anisotropy. This approach relies on the mild assumption of local stationarity and involves a kernel-based experimental local variogram a weighted local least-squares method for the inference of local covariance parameters and a kernel smoothing technique for knitting the local covariance parameters together for kriging purpose. According to the results, this non-stationary geostatistical method outperforms the traditional stationary geostatistical method in terms of prediction and prediction uncertainty accuracies.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-01289181
Contributeur : Serge Antoine Séguret <>
Soumis le : mercredi 16 mars 2016 - 11:47:34
Dernière modification le : lundi 12 novembre 2018 - 10:58:38

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Francky Fouedjio, Serge Antoine Séguret. Predictive Geological Mapping Using Closed-Form Non-stationary Covariance Functions with Locally Varying Anisotropy: Case Study at El Teniente Mine (Chile). Natural Resources Research, Springer Verlag, 2016, ⟨10.1007/s11053-016-9293-4⟩. ⟨hal-01289181⟩

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