Ore and Gangue Minerals of the Hera Au-Pb-Zn-Ag Deposit, Cobar Basin, NSW

Angela Lay; Ian Graham; Lachlan Burrows; Adam McKinnon; Karen Privat

doi:10.1071/ASEG2018abM1_3D

1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration

ISSN: 2202-0586
E-ISSN:

oa Ore and Gangue Minerals of the Hera Au-Pb-Zn-Ag Deposit, Cobar Basin, NSW
Authors Angela Lay^a, Ian Graham^b, Lachlan Burrows^c, Adam McKinnon^d and Karen Privat^e
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^a School of Biological Earth and Environmental Sciences (BEES), University of New South Wales (UNSW), Sydney, , Australia, [email protected] ^b School of Biological Earth and Environmental Sciences (BEES), University of New South Wales (UNSW), Sydney, , Australia, [email protected] ^c School of Biological Earth and Environmental Sciences (BEES), University of New South Wales (UNSW), Sydney, , Australia, [email protected] ^d Aurelia Metals Ltd, , Nymagee, , Australia, [email protected] ^e Electron Microscopy Unit (EMU), University of New South Wales (UNSW), Sydney, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2018, Issue 1st Australasian Exploration Geoscience Conference – Exploration Innovation Integration, Dec 2018, p. 1 - 7
DOI: https://doi.org/10.1071/ASEG2018abM1_3D
- Published online: 01 Dec 2018

Abstract

The Hera Au-Pb-Zn-Ag deposit is located within the Cobar Basin of the Lachlan Orogen. The deposit was classified as a Cobar-type deposit, however the presence of skarn gangue mineral assemblages associated with the main mineralisation and host-rocks suggest a much higher temperature of ore formation. These gangue assemblages also are the first occurrence of these for deposits within the Cobar Basin. The gold at Hera shows poor correlation with the other metals and minerals suggesting multiple generations of crystallisation. The primary silver minerals in the deposits are Ag-sulfosalts (tetrahedrite), acanthite and dyscrasite?. The presence of Ag-sulfosalts often closely associated with gudmundite within the main mineral assemblages. Scheelite is quite common and associated with the main sulphides and also within the host siltstone.

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References

Aurelia Metals Ltd, 2017, Hera resources and reserves, Available at http://www.aureliametals.com/uploads/5/8/Hera%20Resources%20and%20Reserves%202017.pdf (accessed 10th August 2017).
Burrows, L., Graham, I.T., Lay, A., McKinnon, A., 2017, Comparison of the ore and gangue mineralogy and metal ratios for the different ore lenses of the Hera Mine, Central NSW: Geological Society of Australia Specialist Group in Geochemistry, Mineralogy and Petrology (SGGMP) biennial meeting, Benalla Victoria 2017, Extended Abstracts.
Collins, A., Mackenzie, I., Randell, J., Jeffrey, S., 2006, Hera gold base metal deposit - thoughts from the porch: Mineral Exploration Geoscience in New South Wales, Mines and Wines Conference.
David, V., 2006, Structural setting of mineral deposits in the Cobar Basin, unpublished Ph.D Thesis, University of New England.
Feltone, E.A., 1981, Geology of the Cambelego 1:100,000 Sheet 8134. Geological Survey of New South Wales
Fitzherbert, J.A., Mawson, R., Mathieson, D., Simpson, A.J., Simpson, C.J., and Nelson, M.D., 2017, Metamorphism in the Cobar Basin: current state of understanding and implications for mineralisation, Geological Survey of New South Wales Quarterly Notes, No. 148, 1-36.
McKinnon, A., 2017, Application of normative ore mineralogy to geological and metallurgical datasets at the Hera Au-Pb-Zn-Ag Mine, New South Wales, Australia. 10th International Mining Geology Conference, Hobart Tasmania 2017. Extended Abstracts
Rayner, E.O., 1969, The copper ores of the Cobar Region, New South Wales,. New South Wales Geological Survey-Memoir Geology 10, 1-131.
Skirka, M, and David, V., 2003, Hera Au-Cu-Zn-Pb-Ag Prospect, Nymagee, New South Wales, CRC LEME

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Article Type: Research Article

Keyword(s): Cobar Basin; gold; gudmundite; Hera Au-Pb-Zn-Ag deposit; scheelite; tetrahedrite

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