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The rocker, or cradle, form of placer mining enabled one miner to handle more material than by simple panning.
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Keywords: alluvial, apparatus, cradle, deposits, device, diagram, enabl, enabled, excavating, excavation, extracting, extraction, figure, form, gold, handle, hopper, horizontal, illustration, illustrations, material, miner, mineral, mining, panning, panning., placer, riffles, rocker, rush, science, simple, surface, technology