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placer mining:see miningmining,
extraction of solid mineral resources from the earth. These resources include ores, which contain commercially valuable amounts of metals, such as iron and aluminum; precious stones, such as diamonds; building stones, such as granite; and solid fuels, such as coal and
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placer mining[′plās·ər ‚mīn·iŋ]
The extraction and concentration of heavy metals from placers.
Mining of gold by washing the sand, gravel, or talus.