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Alluvial Gold Mining And Trade In Nineteenth Century South . In some areas, alluvial gold was worked by shafts sunk into river banks and reef mining may have developed from this technique see, for example, the rhodesian mining review, 1913, 185. for further details of alluvial mining methods, see phimister, placer mining in south central africa, unpub. research paper.South Africa jaw crusher,mobile crushers,stone crushing machine,gold crusher,ball mill,stamp mill,sag mill for sale by Binq Mining Equipment Manufacturers. Machinery – Used Sand Blasting Machines, Used Sand Blasting.