Scholarly record
GEOSTATISTICAL MODELING AND RESERVE ESTIMATION OF CHOGHART IRON ORE DEPOSIT THROUGH ORDINARY KRIGING METHOD
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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References10
Iranian Central Iron Company, Sma ll Scale Exploration Report, Choghart,
Iranian National Steel Company, Bi g Scale Exploration Report, Choghart,
F. Moor and S. Modabberi (2003), Origin of Choghart iron oxide deposit, Bafq mining district, Central Iran: new isotopic and geochemical evidence, Journal of science, Islamic Republic of Iran 14(3): 259-269.
Samani B.A. Metallogeny of the Pr ecambrian in Iran, Precambrian research, 39:85-105(1988)
A. A. Hassani Pak and M Sharafodin (2002), Analysis of exploratory data, Tehran University publishing.
H. Madani (1995), Introduction to Geostatistics, Amirkabir University publishing
David, Michel (1982), Geostatistical Ore Reserve Estimation, Elsevier Scientific Publishing Co.
Journel, A.G.and Huijbergts, CH. J (1978) Mining Geostatistics, 2nd printing (Revised). Academic, press, London.
Rendu, J.M. (1979), Normal and Lognormal Estimation, Mathematical
Geology, Vol.11, N0.4, P.407-422. Total Blocks CategoryGrade(%) Blocks Percent of Reserve (%) A 35.8 175 3 B 40.9 1330 19 C1 49.55 2170 32 C2 54.55 2643 39 6858 C3 58.36 510 7 5th International Multidisciplinary Scientific GeoConference SGEM2005 www.sgem.org International Conference
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