ground sluice

ground sluice

noun Mining.
a trench, cut through a placer or through bedrock, through which a stream is diverted in order to dislodge and wash the gravel.

Origin:
1865–70

ground-sluic·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ground sluice is always a great word to know.
So is callithumpian. Does it mean:
a scrap or morsel of food left at a meal.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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