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gold mining dredge hot water heater system plans sand making

Jun 13 2018 · A sluice box works because gold is 15 times heavier than sand and gravel and so is easily trapped by the riffles and carpet in the sluice box Dredges almost always need to be mounted on a set of floats This is because a dredge has just enough power to lift water and gravel to just above the surface of the water

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