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- W282995211 abstract "Au-Cu mineralisation at Cadia East is directly associated with alkalic porphyritic monzonite dykesintruded into the Forest Reefs Volcanics, an Ordovician volcanic and volcaniclastic succession, withinthe Lachlan Fold Belt of Eastern Australia. Resource development indicates that over 20 millionounces of gold is contained in two mineralised domains - a high-grade, sheeted vein array at depth anda shallow disseminated mineralisation zone at shallower levels. Multiple sheeted quartz-carbonate-bornite-chalcopyrite ± molybdenum vein arrays characterise thehigh grade zone (720 Mt @ 0.7g/t Au), with associated biotite-magnetite-orthoclase alterationassemblages occurring dominantly as vein selvages. The broadly continuous NW-SE to E-W strike ofthese sheeted veins across the deposit suggests a tectonic influence on vein development. Quartzmonzonite dikes intruding the Ordovician Forest Reefs Volcanics have a similar trend to these sheetedvein arrays and appear to be concurrent with mineralisation. Disseminated low grade mineralisation (430Mt @ 0.4 g/t Au) is preferentially developed in volcanicconglomerates of the Forest Reefs Volcanics in the upper sections of the deposit. This mineralisation isassociated with a high level, broadly stratabound, texturally destructive quartz - K-feldspar - albite -tourmaline - sericite alteration. This alteration has been suggested to represent the alkalic equivalent oflithocaps which overlie some calc-alkaline porphyry Cu deposits. Previous isotopic studies at Cadia East have precluded externally derived fluids in the hydrothermalsystem, solely implicating magmatic fluids for the observed mineralisation and alteration zonation.However, externally derived brines have been shown to have been involved in the formation of sodicalteration in the porphyry environment at the Yerington system, Nevada, and a comparison between thetwo systems suggests that there may have also been an external fluid involved in the formation of theupper alteration domain at Cadia East. This distinctive, broadly stratabound alteration zone has notbeen previously documented in deposits of this type and may represent a potential exploration vectorfor this mineralisation style." @default.
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- W282995211 date "2008-01-01" @default.
- W282995211 modified "2023-09-27" @default.
- W282995211 title "Contrasting mineralisation and alteration styles and a possible alkalic lithocap at the Cadia East porphyry Au-Cu deposit, NSW, Australia" @default.
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