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After nine years, the Gold Canyon placers were producing less, and many miners left for the Mono Lake placers. [2]: 2 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 ...
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.
In Chile the district was first officially recognized in 1975 and operated in 1979. El Indio, the main mine in the area was discovered in 1975 by St. Joe Minerals, and placed in production in 1981, with initial production of bonanza gold from quartz-gold veins: 500, 000 MT @ 121 g/MT Au.
Narrow quartz veins, found along fractures in the diorite and along bedding planes in the shale, contain most of the high-grade gold ore. Ore values decrease with depth, and few mines have been developed deeper than 150 feet (46 m). In addition to the quartz veins in the shales, the diorite contains "low grade mineralized shear zones". [3]
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The zone contains hundreds of mines and prospects, including some of the best-known historic mines of the gold-rush era. 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 ...
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]
Gold on quartz, North Star Mine North Star sheeted veinlets, polished slab of granodiorite showing sheeted zone of carbonate veinlets. The North Star vein has an east and west course, with a dip of about twenty-three degrees to the north. This mine was opened by an incline shaft sunk on the course of the vein to a depth of nearly 700 feet (210 m).
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