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ground sluice

noun, Mining.
1.
a trench, cut through a placer or through bedrock, through which a stream is diverted in order to dislodge and wash the gravel.
Origin
1865-1870
1865-70
Related forms
ground-sluicer, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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