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THE VARIABILITY OF VOLUMETRIC DENSITY OF THE SELECTED INDIVIDUAL LITHOLOGICAL UNITS IN THE CU-AG DEPOSIT IN THE LUBIN-GLOGOW COPPER DISTRICT AND ITS INFLUENCE ON THE RESOURCES
Abstract
The paper presents the results of the study on the variability of volumetric density of individual lithological types in the Cu-Ag deposit in the Lubin-Glogow Copper District (the Polkowice-Sieroszowice mining area). In the examined deposit, the three main lithological types are made of eighteen ore types with different petrographic and mineralogical composition. Six lithological units with the largest share in the deposit resources were selected for the examination. The statistical description has shown that the variability of volumetric density of individual lithological units is low (coefficients of variation not exceeding 6%). The volumetric density distributions show a left-sided asymmetry or are close to symmetric. Geostatistical examination of the variability of volumetric density using semivariograms has shown the presence of moderately or poorly marked non-random variability component except clayey dolomite in which variability was random. In addition, the volumetric density data sets of individual lithological units have shown the homogeneity of this parameter, which was confirmed by the Games-Howell test. A comparison of the mean volumetric densities in the Cu-Ag deposit, calculated on the basis of experimental sampling, with their reference values used to estimate the deposit resources during its exploitation has shown a significant difference between the analyzed parameters (ranging from 0.4% to 12%).
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