fourche de sluice

OBS: Sluice : Appareil de préconcentration gravimétrique, constitué d'un simple chenal incliné, muni de riffles transversaux à l'aval et à l'amont desquels s'accumulent les minéraux les plus denses.

OBS: Sluiceway : An artificial channel into which water is let by a sluice.
OBS: Sluice : A long trough-like box set on a slope of about 1 in 20, through which placer gravel is carried by a stream of water. The sand and gravel are carried away, while most of the gold and other heavy minerals are caught in riffles or a blanket on the floor.