Show placer mining in placer mining from alluvial deposits the gold bearing gravel is is i first shoveled down a sluice who whose se stair like arrangement of fini uniform form wooden blocks about an inch high catch particles of gold dust and allow the lighter sands to pass over them the gravel is then taken from the sluice and washed in a prospectors pan large lakes flakes are easily picked out but the dust i is amalgamated in mei mercury mercury cury and later late r separated epa rated usually by straining the mixture through a chamois |