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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.
Most of the gold was found in eroded rock and mixed in with quartz. Besides placer deposits of gold, and gold bearing quartz in weathered rock, gold also occurs in quartz veins. The most profitable veins, in the Dahlonega District, occur in the contact zone between mica-schists and granite or diorite. [2]: 59–61 The discovery of gold in the ...
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 ...
Boudinaged quartz vein (with strain fringe) showing sinistral shear sense. Starlight Pit, Fortnum Gold Mine, Western Australia. Veins are common features in rocks and are evidence of fluid flow in fracture systems. [7] Veins provide information on stress, strain, pressure, temperature, fluid origin and fluid composition during their formation. [2]
Crystal Mine is located near Juneau in the U.S. state of Alaska. The quartz ledge at the Crystal Mine was first discovered in 1895 by B. Heins. It was so named because of the large pyrite cubes which were found occurring in the surface outcrops of the ledge. Gold was extracted till 1905 from quartz using ten-stamp mill and from about 1,000 feet ...
The gold from Gold Canyon came from quartz veins, toward the head of the vein, in the vicinity of where Silver City and Gold Hill now stand. As the miners worked their way up the stream, they founded the town of Johntown on a plateau. In 1857, the Johntown miners found gold in Six-Mile Canyon, which is about five miles (8 km) north of Gold Canyon.
Pyrite with chalcopyrite and gold occupies the quartz-rich zones as blebs and small veins. [15] Mining operations began at Leckie Mine, a now abandoned gold mine 3 km (1.9 mi) north of the Temagami, in the early 1900s with the construction of a 17 m (56 ft) mine shaft with 27.3 m (90 ft) of underground workings. In 1909 about 270 tons of ore ...
Individual gold deposits within the Mother Lode are gold-bearing quartz veins up to 15 metres (49 ft) thick and a few thousand feet long. The California Mother Lode was one of the most productive gold-producing districts in the United States. Now it is known as a destination for tourism and for its vineyards. [5]
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