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Temora, Gidginbung |
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New South Wales, NSW, Australia |
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Au Ag
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Super Porphyry Cu and Au
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The Temora or Gidginbung gold-silver deposit is located 15 km NNW of the town of Temora in central New South Wales, Australia. It lies within one of the complex series of deformed, generally north-south to NNW-SSE trending belts of early Palaeozoic volcanics, volcaniclastics and sediments intruded by Silurian to Middle Devonian granitoids and sub-volcanics that constitute the Lachlan Fold Belt in the states of New South Wales, Victoria and Tasmania that make up south-eastern Australia.
The Gidginbung deposit was formed within a poorly exposed, possibly late Ordovician to Silurian, intermediate complex within the Molong Volcanic Arc near the west of the Tumut (Bogan Gate) Synclinorial Zone. Extensive Devonian granites are exposed to the east and NE.
Ore is hosted by intermediate volcanics as a series of irregular zones of silicification enveloped by advanced argillic alteration. The rocks are predominantly massive feldspar porphyritic intermediate volcanics and volcaniclastics.
The gold and silver is localised in a 600 x 130 m trending body of microcrystalline silica surrounded by a strongly foliated advanced argillic alteration zone, which is essentially barren, except along sheared and brecciated contacts with the silica zone. The entire economic resource is within the supergene enriched 5 to 25 m thick zone of oxidation. Partial oxidation persists to 90 m depth.
In the primary zone the silica is brecciated and cut by irregular sub-vertical pyrite+enargite veins. The same sulphides are also present as disseminations, vug fillings, polycrystalline aggregates and discontinuous stringer veins. Gold is predominatly in the enargite as inclusions of gold-silver tellurides and native gold. Silver is mainly in tetrahedrite, associated with the enargite.
Pre-mining reserves were 4.5 Mt @ 2.5 g/t Au, 5.4 g/t Ag.
For more detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1990.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Allibone A H, Cordery G R, Morrison G W, Jaireth S, Lindhorst J W 1995 - Synchronous advanced argillic alteration and deformation in a shear zone-hosted magmatic hydrothermal Au-Ag deposit at the Temora (Gidginbung) Mine, New South Wales, Australia: in Econ. Geol. v90 pp 1570-1603
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Lindhorst J W, Cook W G 1990 - Gidginbung Gold-Silver deposit, Temora: in Hughes F E (Ed.), 1990 Geology of the Mineral Deposits of Australia & Papua New Guinea The AusIMM, Melbourne Mono 14, v2 pp 1365-1370
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Thompson J F H, Lessman J, Thompson A J B 1986 - The Temora Gold-Silver deposit: A newly recognized style of high Sulfur mineralization in the Lower Paleozoic of Australia: in Econ. Geol. v81 pp 732-738
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White, N.C., Leake, M.J., McCaughey, S.N. andd Parris, B.W., 1995 - Epithermal gold deposits of the southwest Pacific: in J. of Geochemical Exploration v.54, pp. 87-136.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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