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Summary Historically the majority of gold was mined from placer deposits where gold has settled out of an existing or ancient waterway downstream of where nuggets had eroded out of rock outcrops Some early miners also used an early form of hardrock mining digging solid veins of gold out of rock where mineralized water had deposited it over thousands of years

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Gold mining is the resource extraction of including permits from the U S Corps of Engineers the Montana Department of Environmental Quality and the local county water quality boards Some large suction dredges 100 horsepower 75 kW 250 mm 10 in are used in commercial production throughout the world Sacha J 2011 Thematic

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Although the price of gold has increased significantly since 1967 when the fixed price of 35 an ounce was terminated the increases in the cost of virtually every supply and service item needed in prospecting and mining ventures have kept profit margins

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Gold mining provides around 90 of the total gold supply Discover the geographical diversity of gold production and the lifecycle of a gold mine except Antarctica and gold is extracted from mines of widely varying types and scale There are times when miners will want to lock in a specific price for their future gold production

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Nineteenth century gold miners used wooden sluices that were at least 12 feet long but modern gold prospectors primarily use sluice boxes made of plastic or metal which are typically 24 36 or 48 inches long and 6 to 10 inches wide The idea is to position a sluice box in a running stream so that the water does the work separating the dirt and rocks away from the gold Since gold is heavy

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1 1 PHASES OF A MINING PROJECT There are different phases of a mining project of beneficiation process usually used with gold silver and copper ores that merits separate attention because of the serious environmental and public safety impacts With leaching finely ground ore is deposited in a large pile called a leach pile on top of an impermeable pad and a solution

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