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SIMULATION OF COPPER CONTENT IN THE SUNGUN PORPHYRY DEPOSIT THROUGH SEQUENTIAL GAUSSIAN SIMULATION (SGS), IRAN

AUTHOR/S: O. ASGHARI, A. HEZARKHANI
Sunday 1 August 2010 by Libadmin2007

7th International Scientific Conference - SGEM2007, www.sgem.org, SGEM2007 Conference Proceedings/ ISBN: 954-918181-2, June 11-15, 2007

ABSTRACT

The Sungun porphyry copper deposit is located 75km northwest of Ahar in
northwestern Iran. The Conditional Simulations, based on 31068 XRF rock
analysis from the Sungun porphyry copper deposit have been applied to
Geostatistical simulation. Statistical investigations reviled that, the Cu input
data had single-population characteristics and obeyed a lognormal model. To
carry out this geostatistical investigation, a spherical model was fitted over an
empirical variogram.
Plotting the empirical variogram in different directions and dips showed
geometric anisotropy for the deposit in both hypogene and supergene zones.
For simulating via Sequential Gaussian Simulation (SGS) method, data
were transferred to standard normal and then simulated 100 times. All of
the realizations were honor to histogram and variogram, so all realizations
are valid. E-Type and probability maps are drawn in 12.5 meters intervals
and grade-tonnage curves were drowning for each realization. E-Type maps
evaluate average 621 million tones with an average copper grade of %0.68
Cu for the whole deposit. Based on the illustrated Grade-tonnage curves, the
range of tonnage variance, that is between 530 and 721 million tones have been
estimated.

Keywords: Sequential Gaussian Simulation (SGS), kriging, Sungun, copper.