GMRAP ID | 565 |
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Alternate names | Coalstoun Lakes |
Tract name | East Tasmanide - Central sub-tract (009pCu8004b) |
Site status | deposit |
Country | Australia |
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State or province | Queensland |
Geographic location | 151.83, -25.6168 |
Geologic map unit | 151.83, -25.6168 |
Nearby data |
Deposit type | Porphyry copper |
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Age (Ma) | 235Ma |
Age determination method | K-Ar |
Age range | 235 ±4 Ma |
Age reference | Ashley and others (1978) |
Minerals | actinolitic hornblende, albite, anhydrite/gypsum, biotite, bornite, carbonate, chalcocite/digenite, chalcopyrite, chlorite, covellite, chrysocolla, epidote, fluorite, galena, goethite/limonite, hematite/specularite, kaolinite, magnetite, malachite, molybdenite, neotocite, pyrite, rutile, sericite, sphalerite, tremolite-actinolite, tourmaline, turquoise |
Associated rocks | mafic to felsic metavolcanic rocks, meta-andesite, meta-basalt, siliciclastic metasedimentary chert, graywacke, shale, siltstone, diorite porphyry, quartz diorite, tonalite porphyry, trondhjemite, granodiorite porphyry, dacite porphyry, breccia pipes |
Tectonic setting | continental margin |
Stratigraphic age | Middle Triassic |
Development status | Prospect |
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Major commodities | Cu |
Minor commodities | Au, Mo |
Trace commodities | Ag |
Tonnage (Mt) | 80Mt |
Cu grade (%) | 0.3% |
Contained copper | 240,000t |
Gold-Moly ratio | -9999 |
Comments | Location, tonnage and grade of inferred resources, reported by Geoscience Australia (2010). Exposed porphyry-related stockwork of fracture-filling quartz-pyrite-chalcopyrite veinlets; locally up to 0.015% Mo (Ashley and others, 1978). Ore area 1.8 square km, alteration A axis 1.1 km, B axis 0.8 km, alteration area 1.2 km, sulfide A axis 0.7 km, B axis 0.7 km. Fracturing weak to moderate. Lower to mid part exposed. Secondary enrichment locally strong. Includes 7.7 Mt at 0.6% Cu in shallow supergene sulfide zone. Central altered zone of biotite-orthoclase-albite-magnetite, mineralized with pyrite-chalcopyrite-molybdenite. Outer zone of quartz-sericite-pyrite. Retrograde propylitic assemblage overprints other zones. |
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Study area name | Australia |
References | Ashley and others (1978); Horton (1978); Murray (1990); Singer and others (2008); Ewers and others (2002); Geoscience Australia (2010); Geological Survey of Queensland (2010) |
Site reference | Bookstrom and others (2014) |