Wiktionary
sluice box
alt. A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box. n. A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box.
Usage examples of "sluice box".
Questions that had accumulated in Iblis's mind spilled forth like water tumbling through a sluice box.
Placer mining for the most part, as was shown by the remains of a flume or a sluice box here and there.
There was nothing else to see except for a well dug off to one side, sporting a crooked windlass that looked about ready to collapse, and the remains of a crude wooden sluice box set up alongside it.
There's the more difficult ones, Sluice Box, Mother Lode, and Sundance .