What is Sluice-box?

Sluice-box definition and meaning on Dictionary terms:
an artificial channel for conducting water, often fitted with a gate (sluice gate) at the upper end for regulating the flow.
the body of water held back or controlled by a sluice gate.
any contrivance for regulating a flow from or into a receptacle.

a channel, especially one carrying off surplus water; drain.
a stream of surplus water.
an artificial stream or channel of water for moving solid matter: a lumbering sluice.
Also called sluice box. Mining. a long, sloping trough or the like, with grooves on the bottom, into which water is directed to separate gold from gravel or sand.

verb (used with object), sluiced, sluic