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Location: 3 km NE from Coolgardie, Western Australia, Australia
Level 2 159 Adelaide TerraceEast PerthWestern Australia, Australia6892
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Greenfields depositThe Greenfields deposit is located within the Greenfield dolerite sill within the Coolgardie Greenstone Belt. There are three rock types present in the pit; dolerite (southwall), felsic volcaniclastics (footwall to mineralisation) andultramafics(North Wall). The mineralisation at Greenfields forms a conjugate set of steep and moderate dipping lodes.Mineralisation is hosted by a quartz vein stockwork that exploits a conjugate set of brittle-ductile fractures. Bucky quartz veins have accessory pyrrhotite and arsenopyrite sulphides and sometimes visible gold is observed.Veins display crack seal textures and are commonly weakly wall rock laminated.The wall rock to the veins is commonly bleached over 0.2-0-.4m intervals.Brilliant South depositThe deposit lies on the western margin of the Archaean Norseman–Menzies Greenstone Belt. Host rocks at Brilliant are a sequence of Archaean Basalts and Ultramafics, which have been intruded by a suite of porphyry dykes (also described as granodiorites). The porphyries host the bulk of the mineralisation, occurring in two orientations:1. Steeply dipping (70 -80°) with an average width of 3 to 4m(Historically conventional model used for this resource estimate), 2. Shallow east dipping (20 -40°) with average widths of up to 2-4m(not modelled at this time). Mineralisation consists of a stock work of quartz / sulphide micro-veining and albitic alteration of the porphyry.Bonnie Vale Quarry Lode depositLocally the geology of the deposit is dominated by the Bonnie Vale Tonalite, with an ultramafic to the east and west of the tonalite. This ultramafic has been logged as a carbonate altered ultramafic and described as a komatiite in Hallberg’s regional mapping. Mineralisation is hosted within large (strike lengths >300m) quartz reefs which range in thickness from centimetre scale to several metres. The known reefs strike sub-parallel to the edge of the tonalite, with the main orientations being an easterly dip (e.g. Westralia) or northeast (Bonnie Vale, Quarry Reef) of 40 to 60 degrees.
