Deposits Gold Placer r t ) .. USGS
production is close to, and sometimes less than, placer gold production. Most of the placer mining was done before 1900 by smallscale methods utilizing portable equipment, such as rockers, sluices, and drywashers, to work small deposits; most of the placer gold produced in the State since 1900 was mined by a few very large dredge operations ...