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GEOSTATISTICAL MODELING AND RESERVE ESTIMATION OF CHOGHART IRON ORE DEPOSIT THROUGH ORDINARY KRIGING METHOD

AUTHOR/S: ASGHARI, O., HEZARKHANI, A.
Sunday 1 August 2010 by Libadmin2005

5th International Scientific Conference - SGEM2005, www.sgem.org, SGEM2005 Conference Proceedings/ ISBN: 954-918181-2, June 13-17, 2005, 631- 642pp

ABSTRACT

Choghart iron ore deposit is located 13 kilometers northeast of Bafq and 120 kilometers
east of Yazd. In order to model the deposit and estimate its reserve, 331 input data gained
from 125 boreholes were used. Iron grade was selected as the major regional variable on
which the present research has focused. All of the available data were changed to two-meter
composites so that statistical equalization could be reached. Studies indicated that Fe input
data had single - population characteristics and obeyed a natural model.
To carry out geostatistical studies, a spherical model was curve fitted over an empirical
variogram. Then the model was verified through cross validation method and proved to be
valid with a coherence coefficient of 0.85 between the estimated and real data. Plotting the
empirical variogram in different directions showed neither geometric nor regional anisotropy
for the deposit. To estimate the iron 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. Based on this estimation, the intact reserve of the exploited minerals was
found to be 218,598,000 tons of ore with an average iron grade of 51.7%. Subtracting the
exploited portion led to an estimation of 142,556,000 tons of ores with an average iron grade
of 50.22%. Finally, based on the estimation error magnitude, the existing deposit was
categorized as A,B,C1, C2 and C3.

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