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Location: 60 km SE from Canberra, New South Wales, Australia
920 Majors Creek RoadMajors CreekNew South Wales, Australia2622
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The Braidwood Granodiorite and adjacent Long Flat Volcanics host the primary gold mineralisation in the Dargues Reef–Majors Creek area.Three major mineralisation styles are present: auriferous, pyrite-rich greisenous zones such as those at Dargues Reef, Exeter Farm and Scotsmans Gully; gold–base metal-rich veins/lodes, including those adjacent to the Majors Creek village; and those deposits which have both greisen- and vein-type mineralisation, including those in the Snobs mine area, which takes in Snobs Reef (Snobs Lode–Stewart & Mertons–United Miners zone) and The Creek prospect.Mineralisation at Dargues occurs as a number of discrete, fracture-controlled sulphide lodes situated within intense zones of phyllic alteration (silica-chlorite and lesser epidote and sericite). The lodes are steeply dipping (80 - 90 degrees) and have a variable strike from E-W to ENE-WSW. The main zones of mineralisation (commonly referred to as the Big Blow and Main Lode) occur on the northern side of a parallel diorite dyke with some minor mineralisation sporadically developed on the southern margin. The mineralisation and dyke are synonymous with the dominant fault orientations of the region, an E-W striking vertical set and a ENE-WSW set, dipping steeply to the SSE. The sulphide lodes are generally 0.5 m to 10 m wide (true width) and up to 200 m long and display a distinctive zonal alteration assemblage. The lodes are generally comprised of potassium felspar-albitepyrite+/-chlorite-sericite-silica-carbonate with the alteration assemblage extending up to 60 m from the lodes. The main sulphide mineral is pyrite, although chalcopyrite, sphalerite and other sulphides are also present. Gold values are directly linked to pyrite content (ranging from 5% to 30%). The gold grains occur as small inclusions of native gold in pyrite or along the pyrite grain boundaries. Rare occurrences of visible gold in association with minor quartz veining have been observed at depth with grades of up to 538g/t over a 0.85m width.The Dargues Reef Au deposit extends for approximately 400m in an E-W direction. The mineralisation extends from surface to a maximum vertical depth of 590m below the surface. True width of the mineralisation varies from 2m up to approximately 12m.
