Joint Simulation of Grade and Rock Type in a Stratabound Copper DepositReport as inadecuate




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This work deals with the joint simulation of copper grade as a continuousregionalized variable and rock type as a categorical variable in Lince–Estefaníadeposit, located in northern Chile. The region under study is heterogeneous, containingthree main rock types intrusive, andesite and breccia bodies with differentcopper grade distributions. To perform joint simulation, themulti-Gaussian and pluri-Gaussian models are used in a combined form. To this end, three auxiliary Gaussianrandom fields are considered, one for simulating copper grade, up to a monotonictransformation, and two for simulating rock types according to a given truncationrule. Furthermore, the dependence between copper grade and rock types is reproducedby considering cross correlations between these Gaussian random fields. Toinvestigate the benefits of the joint simulation algorithm, copper grade and rock typesare also simulated by the traditional cascade approach and the results are compared.It is shown that the cascade approach produces hard boundaries, that is, abrupt transitionsof copper grades when crossing rock-type boundaries, a condition that doesnot exist in the study area according to the contact analysis held on the available data.In contrast, the joint simulation approach produces gradual transitions of the coppergrade near the rock-type boundaries and is more suited to the actual data.Nota general

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Author: Maleki, Mohammad; - Emery, Xavier; -

Source: http://repositorio.uchile.cl/



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