krigagem ordinária, geoestatística, avaliação de reservas
Abstract
Geostatistical analysis was performed on copper and gold assays of Chapada Deposit, aiming at modeling variograms for ore reserve estimation, by means of the ordinary kriging technique. The copper and gold assays from drill hole samples were composed for 10 m benches and the composed samples were used to make contour maps of copper and gold concentrations for each bench. With the composed samples average horizontal and vertical variograms were computed, which fitted with the spherical model. The resulting models were applied to perform ore reserve estimation, in blocks of dimensions consistent with the available information, using the ordinary kriging technique.
