Krigagem com deriva externa aplicada à avaliação de recursos minerais de calcário e de minério laterítico / Kriging witch external drift applied to evaluation of mineral resources of limestone and lateritic ore

AUTOR(ES)

Jorge Augusto Basilio Fernandes

DATA DE PUBLICAÇÃO

2010

RESUMO

This dissertation is a work on applied geostatistics to evaluation of mineral resources. This application can be considered as the last step to such the task. The basic concepts are based on current geostatistics, with extensive use of informatics resources. The first goal of this work was to test the technique named kriging with external drift in the evaluation of mineral resources, concerning to the resulting gain in the use of more than one variable, mainly whether the use of auxiliary variables con be done in a friendly way. Two deposits were chosen with different geology, a deposit of base metal saprolitic ore and another deposit of limestone. In each deposit two variables were selected, the principal and secondary variable, at lateritic deposit variables were respectively SiO IND.2and Fe and at the deposit of limestone were CaO and SiO IND.2. The three-dimensional modeling of the deposits was made in the software Datamine. The models were transferred to the software Isatis and used as the base for interpolate variables. This model was necessary in the way to print in the estimated blocks the geometry of the ore body. Estimates by kriging with external drift was compared to ordinary kriging, ones this comparison was done to measure the differences between a traditional method widely used to another underutilized, or even non widespread. Results showed minor differences between the blocks estimated by bolth methods. But as in mining sub-sampling can occur from several factors, one can say that the kriging with external drift is a reliable alternative since it requires less effort to perform multivariate estimation than those, for example, to perform the ordinary cokriging.

ASSUNTO(S)

evaluation of mineral resources krigagem com deriva externa kriging with external drift geoestatística multivariada variograma de resíduos avaliação de recursos minerais applied geoestatistics geoestatística aplicada multivariate geostatistics residuals variograms

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