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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.
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.
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".
A quartz – sericite alteration zone typically occurs closer to the center and may overprint. A central potassic zone of secondary biotite and orthoclase alteration is commonly associated with most of the ore. Fractures are often filled or coated by sulfides, or by quartz veins with sulfides. Closely spaced fractures of several orientations ...
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 ...
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]
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.
Quartzolite or silexite is an intrusive igneous rock, in which the mineral quartz is more than 90% of the rock's felsic mineral content, with feldspar at up to 10%. [ 1 ] : 135 [ 2 ] Typically, quartz forms more than 60% of the rock, [ 3 ] the rest being mostly feldspar although minor amounts of mica or amphibole may also be present. [ 2 ]