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A quartz vein, prominent from the surrounding weathered rock at Cape Jervis, South Australia. Open space filling is the hallmark of epithermal vein systems, such as a stockwork, in greisens or in certain skarn environments.
Mongolata is a rural locality in the Mid North region of South Australia, situated in the Regional Council of Goyder. [2] The modern locality was established in August 2000, when boundaries were formalised for the "long established local name".
Quartz reef breaking the surface at Paynes Find, Western Australia. Quartz reef mining is a type of gold mining in "reefs" (veins [1]) of quartz.Quartz is one of the most common minerals in the Earth's crust, and most quartz veins do not carry gold, but those that have gold are avidly hunted by prospectors.
Gully erosion in the Warren Catchment east of Adelaide in the Mount Lofty Ranges 1992. South Australia is an Australian state, situated in the southern central part of the country, and featuring some low-lying mountain ranges, the most significant being the Mount Lofty Ranges, which extend into the state's capital city, Adelaide, which comprises most of the state's population.
Granite (light) with sheeted veins of greisen (dark) at Cligga Head, Cornwall. Greisen is a highly altered granitic rock or pegmatite, usually composed predominantly of quartz and micas (mostly muscovite). Greisen is formed by self-generated alteration of a granite and is a class of moderate- to high-temperature magmatic-hydrothermal alteration ...
Quartz is generally the dominant mineral in the veins, but there are also gold bearing carbonate dominant veins in orogenic deposits. [15] Ore bodies of orogenic gold deposits are generally defined by ≤ 3–5% sulfide minerals, most commonly arsenopyrite in metasedimentary host rocks and pyrite /pyrrhotite in meta-igneous rocks, and ≤ 5 ...
Small-scale boudinage Boudinaged quartz vein within blueschist, Samos, Greece. Boudinage in Greenland near Kangerlussuaq Boudinaged quartz vein in shear foliation, Starlight Pit, Fortnum Gold Mine, Western Australia. Banded gneiss with dike of granite orthogneiss; competent banded gneiss is boudinaged by ductile shear.
One of the largest silver lodes was the Comstock Lode in Nevada, [6] although it is overshadowed by the more recently discovered Cannington Lode in Queensland, Australia. [7] [8] The largest gold lode in the United States was the Homestake Lode. [9] The Broken Hill Lode in South Australia is the largest lead-zinc lode ever discovered. [10]