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INTRODUCTION, CONCENTRATION OF PLACER GOLD ORE, SMALL SCALE RECOVERY EQUIPMENT, Gold Pan, Rocker, Construction Assembly, peration, Sluices, Long Tom, Dip-Box, Shaking Tables, Portable Processing Equipment ,Amalgamation, DRY PLACERS Dry Washers, Air Tables (Oliver Gravity Separator), MODERN RECOVERY EQUIPMENT, Pinched Sluice Systems, Spiral Concentrators Rotating Spirals, Helixes, Jigs, Fine Material Separators, Bartles-Mozely Separator, Bartles CrossBelt Separator, Centrifugal, Concentrators, Bowls, Knelson Concentrator.Figures : Mineral separation on an Oliver gravity separator, Separation on an air table or pneumatic shaking table, Modular jig and circular jig composed of 12 modular jigs, Mineral separation on a Bartles crossbelt concentrator, TRI-R Engineering helix concentrator, Modern sluice lined with screening and rubber matting, Pump and concentrate barrels located inside shed beneath spiral assembly,Gold recovery system at the Stinson Mine,Helix separator in recovery system at Stinson Mine. Construction. Rockers are built in three distinct parts, a body or sluice box, a screen, and an apron. The floor of the body holds the riffles in which the gold is caught. Figure 2 shows a portable rocker that is easily built. The six bolts are removed to dismantle the rocker for easy transportation. The material required to construct it is given in the following tabulation. Assembly. The parts are cut to size as shown in Figure 2. The cleats on parts A, B, C, and D are of1- by 2-inch material and are fastened with nails or screws. The screen (H) is nailed together and the handle (L) is bolted to one side. Portable Processing Equipment. Portable, self-contained processing equipment is available from a number of manufacturers. These devices perform all the steps of gold concentration: washing, screening, and separation of gold.
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