Project Name: OGA 6 Exploration concessions: 18km2, 100% share Target minerals: Au Geology and Ore Deposit: Since 2001, Nittetsu Mining Co., Ltd. has conducted ASTER Image Analysis for mineral exploration targeting porphyry copper-type deposit in Northern Chile. In Oga Area, which is located about 20km southeast of the Escondida mine and 200km southeast of Antofagasta, Region II, Chile, a promising phyllic alteration zone was extracted by ASTER Image Analysis. In 2002 and 2003, surface geological mapping and geochemical survey, including total 89 points of pit survey, were carried out covering the extracted alteration zone. Cu-Mo geochemical anomaly, suggesting possibility of porphyry copper deposit, was confirmed, and quartz-hematite-limonite veinlet networking and acid leaching were observed in this area. Therefore, the company has conducted 12 holes, total 3,068m, of RC drilling in 2004, however, no significant copper mineralization was observed. Low initial copper content in ore-related magma and not enough development of hydrothermal circulation system were considered as the principal reason of such weak copper concentration in this area. On the other hand, the drilling result confirmed significant epithermal Au mineralization. Au anomaly of more than 100ppb was observed in total interval of 240m, which is about 8% of total drilled length, and maximum Au content was 1,300 ppb from 2m interval. The distribution of Au anomaly is not related with the degree of alteration, but probably is controlled by NW-SE trending fault system. Therefore, Au potential could be new regional exploration target around this area. Further exploration works for gold target, including trench survey and diamond core drilling, are required in Oga Area. Exploration activities: [2000-2001] Satellite image analysis using JERS-1 and ASTER data. [2002] Preliminary geological and geochemical surveys (18 km2). [2003] Pit surveys (89 points), geological sketch and geochemical surveys. [2004] RC drilling surveys (12 holes, 3,068m). <<< Location of Oga Project >>> ..... May/2005............ <<< Geochemical Anomaly >>>. May/2005 <<< RC Drillings of Oga area, and Au vein >>>.... May/2005
		Copyrights(C)2002 Nittetsu Mining Co., Ltd. All Rights Reserved.