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Small rough diamonds from Russia. Crystals are about 0.7 to 0.9 mm in size. There are a limited number of commercially available diamond mines currently operating in the world, with the 50 largest mines accounting for approximately 90% of global supply. Diamonds are also mined alluvially over disperse areas, where diamonds have been eroded out of the ground, deposited, and concentrated by water or weather action.
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Law #33, Article 14.2 The prospecting team Shakhtar has been employing about 50 men for the last two decades,Dmitry Likhanov, Russia's Gold Coast Photo- journalism article from Russia: Beyond the Headlines, Rossiyskaya Gazeta mostly from Ukraine who spend six months a year working in Chukotka and then six back at home on the "mainland". the gold is mined alluvially, with a ton of rock having to be washed to produce a gram of gold.
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The Williamson diamond mine is a large open pit mine currently about 90 meters (300 ft) deep. Diamond mining operations at the Williamson diamond mine are composed of four distinct activities: mining of the pit, re- treatment of tailings to recover missed diamonds, and gravel mining both on the property and adjacent to the property where gravel has been alluvially deposited. The open pit mining and tailings re-treatment are the largest of the four operations. The mine employs about 1,100 staff, mostly Tanzanians.
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Small quantities of alluvially deposited diamonds have been known in Australia since the late 19th century, first found by prospectors searching for gold. However, no source volcanic pipe deposit was apparent. Following the discovery of several alluvial diamonds in the West Kimberley region along the Lennard River (Ellendale area) in 1969 a systematic search of Western Australia for the source of these diamonds was began by a consortium of mining companies, collectively known as the Kalumburu Joint Venture. Tanganyika Holdings part of the Kalumburu Joint Venture (later to become the Ashton Joint Venture) had employed Maureen Muggeridge.
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