DCHP-1 Online
rock-bottom sluice-box Placer Mining 
See quote. [See picture at sluice-box].
See also: sluice-box
- 1964 [Hiram F.] Smith . . . is credited with originating the "rock bottom" sluice box, a great aid in the recovery of fine gold.
- 1964 [Hiram F.] Smith . . . is credited with originating the "rock bottom" sluice box, a great aid in the recovery of fine gold.