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Sluice

The same principle may be employed on a larger scale by constructing a short sluice, with carries barriers along the bottom called riffles or bars this will trap the heavier gold particles as water washes them and the other material along the box. This method better suits excavation with shovel or similar implements to feed ore into the device. Sluice boxes can be as short as a few feet, or more than ten feet (a common term for one that is over six feet +/- is a "Long Tom").

A modern sluice box made of metal; in its base are the riffles used to catch gold settling to the bottom

Riffles are grooves in a sluice box. There also can be carpet or other material known as miners moss to trap the gold particles. The small specks are gold, the larger ones are merely pebbles