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Historically, mercury was used extensively in placer gold mining in order to form mercurygold amalgam with smaller gold particles, and thereby increase the gold recovery rates. Largescale use of mercury stopped in the 1960s. However, mercury is still used in artisanal and smallscale gold mining (ASGM), often clandestine, gold prospecting.
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In many countries, elemental mercury is used in artisanal and smallscale gold mining. Mercury is mixed with goldcontaining materials, forming a mercurygold amalgam which is then heated, vaporizing the mercury to obtain the gold. This process can be very dangerous and lead to significant mercury exposure and health risks.
This Article is brought to you for free and open access by the US Geological Survey at DigitalCommonsUniversity of Nebraska Lincoln. ... were used to mine the placer gold deposits. Mercury was used to enhance gold ... many of the finer gold and mercury particles to wash through and out of the sluice before they could settle in the mercuryladen
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#; Historically, mercury was used extensively in placer gold mining in order to form mercurygold amalgam with smaller gold particles, and thereby increase the gold recovery rates. Largescale use of mercury stopped in thes. However, mercury is still used in artisanal and smallscale gold mining (ASGM), often clandestine, gold prospecting.
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Basically, amalgamation is the practice of bringing free gold particles into contact with mercury. When clean gold comes into contact with mercury, the two substances mix to form a compound called amalgam – an amalgam is simply an alloy of gold and mercury. The gold literally is dissolved into the mercury.
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Placer mining / ˈ p l æ s ər / is the mining of stream bed deposits for may be done by openpit (also called opencast mining) or by various surface excavating equipment or tunnelling equipment.. Placer mining is frequently used for precious metal deposits (particularly gold) and gemstones, both of which are often found in alluvial deposits—deposits of sand and gravel in ...
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