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Location: 83 km SE from Cobar, New South Wales, Australia
"The Peak" Burthong RdNymageeNew South Wales, Australia2831
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All known mineralisation in the area is epigenetic “Cobar” style. Deposits are structurally controlled quartz + sulphide matrix breccias grading to massive sulphide.The deposits are located in high strain zones. Metal ratios are variable but there is a general tendency for separate Pb+Zn+Ag±Au±Cu and Cu+Ag±Au ore bodies. These are often in close association with the Pb+Zn lenses lying to the west of the Cu lenses. At Hera Zn is usually more abundant than Pb.Formation temperatures are moderate to high. At Hera the presence of Fe-rich sphalerite, nonmagnetic pyrrhotite and cubanite indicates formation temperatures between 350°C and 400°C. Recognised at Hera are quartz + K-feldspar veins, scheelite, and minor skarn mineralogy which suggest a possible magmatic input. Deposit timing is enigmatic. The main mineralisation occurs as brittle sulphide matrix breccias with silicification grading to ductile massive sulphides that crosscut both bedding and cleavage. Recent age dating on micas and galena gives an age of ~385Ma for the Hera deposit.The mineralisation at Hera, indicated by elevated gold, silver, lead, zinc and sulphur grades, appears to be structurally controlled and is associated with shearing, brecciation and quartz veining. The twelve solid wireframes representing mineralised domains were treated as hard boundaries during estimation of all elements except arsenic. This means that blocks inside a particular domain were estimated using only data from inside that domain. Blocks and data that lie outside of all of the mineralised domain wireframes were treated as a single additional domain. Variogram models were produced for each of the domains with sufficient data and search ellipse orientations were defined for each domain individually. A fault, observable in underground developments, cross cuts the deposit at the southern end of Main North and is interpreted to off-set Main South by about 25 m to the west.The reported resources at Hera span a length of around 800 m and consist of seven en echelon volumes that dip steeply to the west-southwest. The plan width of the resource varies from 2 m to 70 m (including internal low grade zones) with individual stopes reaching up to 25 m wide. The upper limit of the reported estimates occurs at a depth of around 230 m from surface and the lower limit of the resource extends to a depth of 630 m below the surface.
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