Hera: Evidence for Multiple Mineralization Events and Remobilization in a Sediment-Hosted Au-Pb-Zn-Ag Deposit, Central New South Wales, Australia

The Hera Au-Ag-Pb-Zn deposit of central New South Wales, Australia with a total undepleted resource 3.6 Mt @ 3.3 g/t Au, 25 Ag, 2.6% Pb and 3.8% Zn occurs on the SE margin Cobar Basin. It is hosted by shallow marine Mouramba Group overlying turbiditic Amphitheatre Group. siltstones comprise various mixtures quartz, plagioclase, muscovite-phengite, biotite clinochlore, along accessory titanite ilmenite. comprises number discrete lodes which are steeply west-dipping strike NNW. Each lode has different abundances main ore minerals sphalerite, galena, chalcopyrite, pyrrhotite electrum-gold. North Pod Far West lenses have most diverse mineralogy in additionally containing arsenopyrite, native silver, gudmundite, Ag-tetrahedrite, acanthite, dyscrasite, antimony, nisbite breithauptite. Electrum (continuous spectrum from Ag-rich to Au-rich) associated sulfides while gold host rocks cleavages/lineations away ore. sulfur isotope data across indicates magmatic source. Most experienced greenschist facies metamorphism pervasive green chlorite alteration, though differs being distinctly Ag- Sb-rich reached at least amphibolite garnet-wollastonite-vesuvianite-tremolite assemblage. Tremolite relatively abundant throughout suggesting widespread low-T skarn alteration. Cross-cutting pegmatites plagioclase (labradorite-andesine) microcline. Hydrothermal remobilization extensive best explains unusual Ag-Sb-As assemblages lodes.