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Deposit Synonyms
EML 6439; ML 6438; PINE POINT; REX MINERALS
Mineral District
Deposit Summary
primary shear-hosted, and secondary supergene Cu-Au-(Fe) mineralisation. Extensive drilling has defined a resource of 330Mt at 0.6%Cu, 0.16g/tAu, 13.7%Fe. U mineralisation recorded.
Deposit Description
HILLSIDE, discovered by Rex Minerals Ltd in 2008 targeting IOCG-type mineralisation associated with a local near-coincident magnetic & gravity anomaly ~3km long NS. The mag/grav feature was spatially associated with the regional NNE-trending Pine Point Fault. Gravity and magnetic features confined to this structural corridor most likely represent gabbroic intrusive.
Significant Cu-Au-U mineralisation is focussed in numerous, north-trending, sub-vertical to steeply west dipping bodies intimately associated with prograde and retrograde skarn assemblages and associated steeply W-dipping shear/breccia structures. 3 main parallel lenses of Cu-Au-(U) mineralisation were identified, the western Zanoni, Parsee, and eastern Songvaar structures, with overall depth extent of mineralised zones >700m. Mineralisation and associated skarn development is variable both laterally and vertically. Stratabound replacement of metasediments occurs adjacent to skarn, with mineralisation occurring within host metasediment and meta-mafic rock, and within and adjacent to gabbro and A-type felsic intrusive.
Host rock is highly deformed, intensely altered metasediment and skarn of the Wallaroo Group, intruded by Mesoproterozoic granitoid of presumed Hiltaba age. The distribution of mineralisation suggests it was emplaced within a favourable sequence of metasediment-metavolcanic rock.
Primary Cu mineralisation is chalcopyrite>>bornite and chalcocite. Secondary Cu minerals are malachite and chalcocite >> azurite, cuprite, atacamite, chrysocolla, and native copper. Age dating of allanite and titanite from within mineralised and altered rock identified hydrothermal activity at 1585Ma, within error of nearby Hiltaba granite emplacement at 1580Ma. Secondary supergene mineralisation is overlies primary mineralisation along the eastern domains of the deposit.
Resource drilling has identified a JORC resource(inferred +indicated) of 330Mt @ 0.6%Cu, 0.16g/tAu, 13.7%Fe inclusive of 22Mt surface oxidised ore. EML 6439 has been granted over >200ha for resources of construction materials, ie sand, clay, gravel, calcrete.
Discovery Year
~ 2008
Commodities
Copper, Gold, Iron
Ore Minerals
Aikinite, Allanite, Atacamite, Azurite, Bismuthinite, Bornite, Chalcocite, Chalcopyrite, Chrysocolla, Copper, Cuprite, Galena, Gold, Malachite, Pitchblende, Tennantite, Tenorite, Uraninite
Gangue Minerals
Carbonate, Chlorite, Hematite, Magnetite, Pyrite, Quartz
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