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Apr 29, 2013 Suction Dredging for Gold. 23 Nov 2011 “Covering the Basics of Suction Gold Dredging”. The Suction Dredge Dredging on Bedrock. Most gold mining today is done in small operations — one or two persons It sucks up streambed material (rocks, sand, gravel, silt, gold and other A six inch dredge in experienced hands can process.Free Consultation