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506782
Caption: Weathering frees heavy minerals from their matrix, washing them down slope where flowing water forms them into placer deposits
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 22.42 MB
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506700
Caption: The rocker, or cradle, form of placer mining enabled one miner to handle more material than by simple panning
Artist: Encyclopaedia Britannica
Release: Not Applicable
File Size: 33.43 MB