calc-alkaline volcanics and sedimentary rocks, andesite porphyry, basalt, trachyandesite, tuff, shale, siltstone, limestone, dacite to rhyodacite porphyry, quartz diorite, intrusion breccia with quartz-monzonite (monzodiorite to syenite) matrix
Commodity and development information
Cu grade (%)
Intercept at 28 m at 1.0 g/t Au. Cu tonnage and grade (Singer and others (2008); location, Au resource (3.7 Mt at 1.24 g/t Au) from Geoscience Australia, 2010). Exposed; production 1870 to1904 of 318 kg Au and 10 t Cu. Radial veins with 30 to 102 g/t Au; alluvial placers at 6 to 40 g/t Au. Classified as porphyry copper with gold mineralization described by Torrey and White (1998). Central zone of elevated Cu, Mo, peripheral gold halo, and outer zinc-rich zone. Concentric, porph-style potassic, phyllic, propylitic alteration; NW-zone of sheeted quartz veins stockwork of barren qtz veinlets. Late radial qtz-carbonate-Au veins. Calc-alkaline porph Cu-Mo system w/ late, peripheral epithermal Au veins. Au placers.
Study area name
Carr and others (1995); Torrey and White (1998); Richardson and others (1983); Golden Cross Resources (2009); Cooke and others (2007); Singer and others (2008); Geoscience Australia (2010); Perkins and others (1995)
Torrey, C.E., and White, P.D., 1998, Porphyry copper and gold mineralization at Cargo, NSW: Geological Society of Australia, Australian Geological Convention, 14th, Townsville, July 1998, Abstracts No. 49, p. 442.