A long trough with ridges along the bottom. Gravel mixed with water washes over the ridges. The heavier gold is trapped in the ridges and the water and lighter gravel fall out of the end of the sluice. See Yellow Eagle Mine, Alaska Gold Dredges, or Sluicing and My Dad.
A modified rocker. Water power forced dirt through the box, a sloping trough or inclined flume, and heavy gold-bearing particles were caught by riffles or slats. Mercury (quicksilver) was sometimes placed behind the riffles to catch the gold. Hydraulic mining used a long series of sluices.
a long, narrow, sloping box with riffles placed at intervals to catch gold while the lighter sand and gravel are washed through by water
an elongate wooden or metal trough with riffles, over which alluvial gravel is washed to recover gold.
The sluice was invented by a party of Nevada miners in 1850. It consisted of a long trough leading down from their claim to their Long Tom. The sluice was an immediate success, becoming a standard tool of the California gold rush, and was later brought north into Canada .
A trough with riffles through which gravel and wash from placer mining operations is passed so the gold and other valuable minerals will be caught and saved.