DCHP-1 Online
wash-up Placer Mining 
1 n. the process by which gold is recovered by cleaning the riffles, sluice-boxes, etc. after gravel is washed.
See also: wash up wash ((v.))
- 1897 No good mine ever opened not barring the famous Bloomfield, with its record of $115,000 in a single washup is the equal of this property.
- 1900 So, after the wash-up he weighed in a couple of hundred pounds of dust. . . .
2 n. the quantity of gold obtained by this process.
- 1869 On Rock creek the Flume Co. had reached flood ground again, and expected a large wash-up.
- 1897 No good mine ever opened not barring the famous Bloomfield, with its record of $115,000 in a single washup is the equal of this property.