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Kara |
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Tasmania, Tas, Australia |
| Main commodities:
W Mo Fe
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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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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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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