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A 3 inch mobile wash plant for both diamond and gold mining. Use with a 3 inch sluice box and 3 inch dredge pump. Suitable for all terrain. +27822269420 [email protected]. 0 Items. Home; ... Complete wash plant with reduction gearbox and petrol drive engine, 2 sets of sluice boxes, 1 unit for 3 inch pump and 1 unit for hopper feeder, ...