Coalstoun, Porphyry copper deposit

Coalstoun

Porphyry copper deposit in Queensland, Australia

Names and other identifiers

GMRAP ID	565
Alternate names	Coalstoun Lakes
Tract name	East Tasmanide - Central sub-tract (009pCu8004b)
Site status	deposit

Geographic location

Country	Australia
State or province	Queensland
Geographic location	151.83, -25.6168 (click for info)
Geologic map unit	151.83, -25.6168
Nearby data	List Map

Geologic information

Deposit type	Porphyry copper
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

Commodity and development information

Development status	Prospect
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

Reference information

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.
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)

Ashley, P.M., Billington, W.G., Graham, R.L., and Neale, R.C., 1978, Geology of the Coalstoun porphyry copper prospect, southeast Queensland, Australia: Economic Geology, v. 73, p. 945965. (Also available at http://dx.doi.org/10.2113/gsecongeo.73.5.945.)Ewers, G.R., Evans, N., and Hazell, M., (Kilgour, B., comp.), 2002, OZMIN Mineral deposits database [Digital Datasets]: Canberra, Geoscience Australia, metadata accessed September 3, 2013, at http://www.ga.gov.au/meta/ANZCW0703003393.html.

Geological Survey of Queensland, 2010, Mineral occurrence and geology observations: Queensland Government, Department of Employment, Economic Development and Innovation (digital dataset on DVD).

Geoscience Australia, 2010, Australian mines atlas: Geoscience Australia Web page accessed October 20December 27, 2010, at http://www.australianminesatlas.gov.au/.Horton, D.J., 1978, Porphyry-type copper-molybdenum mineralization belts in eastern Queensland, Australia: Economic Geology, v. 73, p. 904921. (Also available at http://dx.doi.org/10.2113/gsecongeo.73.5.904.)

Murray, C.G., 1990, Tasman fold belt in Queensland, in Hughes, F.E., ed., Geology of the Mineral Deposits of Australia and New Guinea: Australasian Institute of Mining and Metallurgy, Monograph Series, v. 2, no. 14, p. 14311450.

Singer, D.A., Berger, V.I., and Moring, B.C., 2008, Porphyry copper deposits of the worldDatabase and grade and tonnage models, 2008: U.S. Geological Survey Open-File Report 2008-1155, [45] p. and digital data, accessed December 31, 2013, at http://pubs.usgs.gov/of/2008/1155/.