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Placer mining /ˈplæsər/ is the mining of stream bed alluvial deposits for minerals. This may be done by open-pit also called open-cast mining or by various surface excavating equipment or tunneling 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 modern or ancient strea…read more
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