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Gary Rhinevault, caretaker of Lost Dutchman's Mining Association camp at Italian Bar on the Stanislaus River, Columbia, CA, using a trommel, 2009.  The trommel is a machine used to obtain gold that can be operated at a close distance to a water source.  Soil and rock material is shoveled into the top cylinder, which spins to break up sticky clay.  The smaller pieces fall into a sluice with running water (pumped from the river) and are separated by density.  Heavier black sand and gold are caught in miner's moss and rubber riffles (to be panned out alter), while lighter material gets flushed out of the system with the water.