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Location: 1.1 Km SE from Cobar, New South Wales, Australia
Hillston Road, Kidman WayPO Box 328CobarNew South Wales, Australia2835
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The deposits fall under the group of epigenetic “Cobar Style” mineralisation and are controlled structurally by major fault zones (Rookery Fault System) and subsequent spurs and splays. The faults are within the Devonian-Nurri Group of sedimentary units displaying lower green schist facies alteration. The economic minerals are contained within quartz stockworks and breccias. The breccia matrix are combinations of quartz, sediment, rhyolite and sulphide. The deposits are often polymetallic with copper, gold, zinc, lead and silver occurring in parallel lenses to the fault zones within the PGM leases.The Great Cobar deposit is located in the northern part of the Cobar Gold Field on the eastern margin of the Cobar basin. The deposit is localised within the sub-vertical dipping Great Cobar Fault which is located wholly within siltstones and shales of the Great Cobar Slate. The deposit has a planar-shaped geometry dipping sub parallel to the regional cleavage and plunging steeply north parallel to a strong stretching lineation. The deposit is approximately 200m long, 20-30m wide and extends over a vertical distance of at least 1,200m. The copper mineralisation is associated with a zone of intense quartz veining, magnetite brecciation and chlorite-stilpnomelane alteration. Copper is contained within chalcopyrite and shows a close association with pyrrhotite. Significant lead and zinc intersections have been recorded from drilling. These intersections form a lens immediately west of the copper mineralisation referred to as the Great Cobar Lead (GCL) lens. The lens typically consists of galena and sphalerite with varying proportions of pyrite and pyrrhotite.Geology and Mineralization The main ore bodies of the Cobar field are known for their great vertical persistence. Their depth may be many times the horizontal length along the shear strike. Their length in turn is usually greater than the worked width. The ore bodies have the shape of a flattened pipe or carrot. The Great Cobar deposit occurs in an anastomosing shear zone within the beds of the Cobar Slate formation (Cobar Group). The strike of the mineralized zone is approximately north-south. The dip of the lodes is almost vertical, with local variation favouring east or west in parts, resembling pinch, and swell. The pitch is steeply to the north. The lead/zinc lode on the western edge of the shear can vary in thickness considerably, from centimetre scale wisps to metre scale massive sulphide.The lead/zinc is usually a marker indicating the end of the copper-gold primary target zone.The copper zone broadly extends eastward from the lead/zinc horizon. An eastern edge does not have a well-defined or sharp contact. The mineralisation can consist of zones of massive mineralisation or stock work space veins. The assemblage consists mainly of chalcopyrite-magnetite-pyrrhotite. Gangue includes quartz, chlorite, and stilpnomelane.
