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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Gold mining Wikipedia. Although this method has largely been replaced by modern methods, some dredging is done by smallscale miners using suction dredges. These are small machines that float on the water and are usually operated by one or two people.
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