Localised Uniform Conditioning in the Multivariate Case – An Application to a Porphyry Copper Gold Deposit

摘要

The paper provides a brief review of the multivariate uniform conditioning and the localisedrnmultivariate uniform conditioning techniques and presents a case study based on a porphyry copperrngold deposit in Peru. Two other important scenarios have been investigated and will be particularlyrnemphasised:rn1. The recovered selective mining unit (SMU)s depend on a combination of copper and gold content,rnwhich can be expressed by means of ‘net smelter returns’ (NSR). Two approaches are compared.rnFirstly, the application of a composite cut-off on NSR on the joint distribution of each grade andrnthe application of uniform conditioning to three variables is investigated, ie for the fi rst approachrnNSR is used as the main variable. The second approach considers copper as the main variable.rn2. In the case of multiple domains the procedure used to apply the technique to process mixed panelsrnis clarifi ed and recommendations are made.