ALTERATION, MINERALISATION, AND FLUID INCLUSION STUDY OF HYDROTHERMAL ORE DEPOSIT IN WANAGON AREA, MIMIKA REGENCY, PAPUA
Wanagon is one of several prospects within PT Freeport Indonesia CoA which has around 2 Moz of gold. This deposit is different from copper dominated pophyry deposit within the same CoA. In this research, microscopic observation, XRD, and fluid incusion were employed to unravel the formation of miner...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/26194 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Wanagon is one of several prospects within PT Freeport Indonesia CoA which has around 2 Moz of gold. This deposit is different from copper dominated pophyry deposit within the same CoA. In this research, microscopic observation, XRD, and fluid incusion were employed to unravel the formation of mineralisation. There are four identified alteration zones in the research area, namely garnet- diopsite, sericite-quartz-calcite±pyrophylite, and epidote-clorite, quartz- calcite±crystoballite. It was observed that gold is associated with pyrite, massive pyrite, and pyrite-sphalerite-galena. Based on fluid inclusion analysis of two- phases (L+V) inclusion, it is suggested that pyrite-sphalerite-galena zone was formed under temperature of 350-370ºC and salinity of 14.9-23.1 wt% NaCl equivalent. Meanwhile, microthemometer analysis of multi-phases (L+V+S) inclusion shows that the homogenization temperature more than 400ºC and salinity more than 26 wt% NaCl equivalent. Mineralization occurs at a hydrostatic depth at 1.5-2 km from the paleosurface. The evolution of hydrothermal fluid might be happen due to the mixing of hydrothermal fluid with another liquid of lower temperature and salinity. |
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