Porphyry copper prospect in Papua, Indonesia

Names and other identifiers

Tract name Western Medial New Guinea Magmatic Belt (142pCu7203)
Site status prospect

Geographic location

Country Indonesia
State or province Papua
Geographic location 136.474, -3.799
Geologic map unit 136.474, -3.799
Nearby data

Geologic information

Deposit type Porphyry copper
Age (Ma) 3.4Ma
Age determination method unknown
Age range 2.9–3.9 Ma
Age reference Directorate of Mineral Resources and Inventory (2004b)
Tectonic setting postconvergence
Stratigraphic age Pliocene

Commodity and development information

Development status Prospect
Major commodities Cu, Au
Gold-Moly ratio -9999

Reference information

Comments Grasberg Area. In place estimated geologic resource about 363 Mt at 0.5% copper equivalent with a cutoff grade of 0.3% copper equivalent. Komopa Porphyry is described as a subvolcanic intrusion with a well-defined, circular, hydrothermal alteration system. Explored as part of Block II of the Nabire Bakti Joint Venture west of Grasberg. Copper-gold mineralized zone 1.5 by 0.5 km in area. Partial drill results reported in 1999 included 10 holes with >10 m intercepts (12–384 m) of 0.39 to 1.16% Cu, 0.10 to 0.718 g/t Au. Age 2.9 to 3.9 Ma. Exploration.
Study area name Southeast Asia and Melanesia
References Gold Fields Ltd. (2004); Indonesian Ministry of Energy and Mineral Resources (2004)
Site reference Hammarstrom and others (2013)
Gold Fields Ltd., 2004, Form 6-K, Securities and Exchange Commission, Commission File Number 1-31318: accessed June 8, 2010, at http://google.brand.edgar-online. com/EFX_dll/EDGARpro.dll?FetchFilingHTML1?ID=3273615andSessionID=4UQHWSP2nUGDYl7. [Web page no longer available.]
Indonesian Ministry of Energy and Mineral Resources, 2004, Digital mineral occurrence database: Jakarta, Indonesia, Indonesian Ministry of Energy and Mineral Resources. [Proprietary data.]