Geostatistical Modeling and Reserve Estimation of Central Part of North Anomaly of Choghart Iron Ore Deposit through Ordinary Kriging Method

North Anomaly of Choghart ore deposit is located 10 kilometers northwest of Choghart and 130 kilometers of Yazd. In order to model the deposit and estimate its reserve, 2461 input data gained from 26 boreholes were used. Fe 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 regularization could be reached. Studies indicated that Fe input data had single - population characteristics. To carry out geostatistical studies, a spherical model was fitted over empirical variogram. Then the model was verified through cross validation method and proved to be valid with a coherence coefficient of 0.82 between the estimated and real data. Plotting the empirical variogram in different directions showed no geometric anisotropy for the deposit. To estimate the Iron grade, kriging method was used according to which, all of the 3 exploitable blocks with dimensions 12.5*25*25 (m(3)) were block estimated within the estimation space.