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The RP-4 is the most widely used and successful gravity shaker concentrating table used world wide by small and large mining operations, and the hobbyist. The patented RP-4 is designed for separation of heavy mineral and gemstone concentrate down to 1 micron size. The RP-4 can process up to 600 lbs. hr. of black sand magnetite or pulverized rock with little or no losses. The RP-4 uses a unique reverse polarity of rare earth magnets which will cause the magnetite to rise and be washed off into the tails leaving just the gold traveling to the catch.