| GMRAP ID | 3548 |
|---|---|
| Tract name | Western Medial New Guinea Magmatic Belt (142pCu7203) |
| Site status | prospect |
| Country | Indonesia |
|---|---|
| State or province | Papua |
| Geographic location | 136.474, -3.799 |
| Geologic map unit | 136.474, -3.799 |
| Nearby data |
| 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 |
| Development status | Prospect |
|---|---|
| Major commodities | Cu, Au |
| Gold-Moly ratio | -9999 |
| 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 (12384 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) |