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GEOSTATISTICAL MODELING AND RESERVE ESTIMATION OF HYPOGENE ZONE IN SUN GUN PORPHYRY COPPER ORE DEPOSIT THROUGH ORDINARY KRIGING METHOD
Abstract
Sungun Porphyry Copper deposit is located 75 kilometers northwest of Ahar and 130 kilometres northwest of Tabriz. In order to model the deposit and estimate its reserve, 31068 input data gained from 152 boreholes were used. Cu grade was selected as the major regional variable on which the present research has focused. All of the available data were changed to 12.5-meter composites so that statistical equalization could be reached. Studies indicated that Cu input data had single - population characteristics. To carry out geostatistical studies, a spherical model was fitted over 2 kinds of empirical variograms in hypogene zone and in Supergene zone. Then the model was verified through cross validation method and proved to be valid with a coherence coefficient of 0.79 between the estimated and real data in hypogene zone. Plotting the empirical variogram in different directions showed geometric anisotropy for the deposit. To estimate the Copper grade, kriging method was used according to which, all of the exploitable blocks with dimensions 12.5*25*25 (m3) were block estimated within the estimation space.
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References12
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