TY - CPAPER AU - O. Asghari AU - A. Hezarkhani AU - V. Rafie TI - LOWERING THE ESTIMATION VARIANCE BY LITHOLOGY AND ALTERATION SEPARATION T2 - 8th International Scientific Conference - SGEM2008 PY - 2008 SP - 487 EP - 496 PB - SGEM Scientific GeoConference ER -