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Kara |
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Tasmania, Tas, Australia |
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W Mo Fe
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Super Porphyry Cu and Au
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The Kara skarn deposit is located some 40 km south of Burnie in north-west Tasmania, Australia.
Mineralisation is principally hosted by the Ordovician Gordon Limestone which succeeds a sequence of molassic red conglomerates and sandstones that in turn overlie a Cambrian suite of felsic volcanics and locally mudstones with minor carbonate components, and metamorphosed Neoproterozoic rocks of the Tyennan Nucleus basement to the south-east.
The deposit occurs as several separate skarn bodies (each from 100 to 600 m long), predominantly developed within the Gordon Limestone in close proximity to the 200 sq. km late Devonian (369 to 319 Ma) Housetop Granite batholith. Some skarn is also within Cambrian mudstones/limestones. The skarn is either in direct contact with the granite, but locally is separated by a thin sliver of sandstone in the footwall of the Gordon Limestone.
At least 4 paragenetic skarn phases have been recognised, namely:
• clinopyroxene ± garnet ± vesuvianite ± wollastonite ± quartz ± scheelite;
• garnet-vesuvianite-magnetite ± scheelite ± apatite ± quartz
• magnetite-amphibole-epidote-fluorite-quartz ± chlorite ± garnet ± vesuvianite ± scheelite ± carbonate ± pyrite ± clinopyroxenite
• hematite ± fluorite ± calcite ± quartz.
Mining has taken place in two phases, the first from 1977 to 1989 when 1.6 Mt of ore were mined to yield 2958 tonnes of concentrates with >65% WO3 and 1.8% Mo. The deposit was subsequently exploited for magnetite.
Remaining reserves in 1990 totalled 1.7 Mt @ >30% Fe and 0.4 Mt of scheelite ore @ 0.75% WO3.
For detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 2000.
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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Zaw K, Singoyi B 2000 - Formation of Magnetite-Scheelite Skarn mineralization at Kara, northwestern Tasmania: evidence from mineral chemistry and stable isotopes: in Econ. Geol. v95 pp 1215-1230
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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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