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sluice box

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sluice box [′slüs ‚bäks]
(mining engineering)
A long, inclined trough or launder with riffles in the bottom that provide a lodging place for heavy minerals in ore concentration.


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Sand and gravel are placed in the high end, the gate to a water supply is opened, and the lighter material is washed through the sluice box and out the lower end.
Brittan says it's taken him and his partner years to perfect the system they use, which involves sucking up sediment, then dumping it into a sluice box that washes the grit and helps separate the gold.
Crews began last year assembling some bulk sample piles for processing, with plans to run the material through a sluice box, a separation method combining water and gravity that is commonly used by placer miners.
 
 
 
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