Placer mining /ˈplæsər/ is the mining of stream bed (alluvial) deposits for minerals. This may . In North America, placer mining was famous in the context of several gold rushes, . Once a placer deposit is located by gold panning, the miner usually shifts to equipment that can . Another form of dry washing is "winnowing".
Gold mining is the resource extraction of gold by mining. As of 2016, the world's largest gold .. Placer mining is the technique by which gold that has accumulated in a . These are small machines that float on the water and are usually operated by one . Colorado, may recover small amounts of gold in their wash operations.