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How To Build A Gold Rocker. FOB Reference Price Get Latest Price Gold Sluice Box Gold Mining Equipment Schematic Drawing Panning For Gold Scrap Gold Gold Prospecting Box Building Metal Detecting Gold Diy How to SIZE a Sluice Box Optimum Slope of a sluice Slope of a sluice is generally in the range of 1.3 cm 12 in. to 3.8 cm 1 12 in. per 30.5 cm 1 ft, depending on the size rock in the feed.Chris Ralph's Gold Prospecting Encyclopedia 2014 6 26 Chris' Prospecting Encyclopedia, Your best source of information on Gold nuggets, gold panning, how to design and build your own mining equipment, metal detecting for nuggets, dredging for gold, prospecting books, California prospecting, 49ers, rock hounds, investing, mining stocks, mother lode, sulfides, turquoise, jewelry, silver, gold.