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A favorite design consists essentially of a combination washing box and screen, a canvas or carpet apron under the screen, a short sluice with two or more riffles, and rockers under the sluice. The bottom of the washing box consists of sheet metal with holes about a half an inch in diameter punched in it, or a half-inch mesh screen can be used.
Delight any kid with one of these cool Valentine's box ideas to store homemade cards and small treats. Plus, see our favorite V-Day boxes to shop online.
Sluice boxes (also known as Scaife trough washers) - Sluice boxes were used to separate small pieces of coal from heavier impurities. [ 2 ] [ 3 ] [ 8 ] Riffles (low ridges set horizontal to the flow of water down the sluice) would capture the heavier impurities while permitting the lighter coal to move on.
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[45] [46] A sluice box is essentially a man made channel with riffles set in the bottom. The riffles are designed to create dead zones in the current to allow gold to drop out of suspension. [45] [46] The box is placed in the stream to channel water flow. Gold-bearing material is placed at the top of the box.
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Because the magnetite is usually heavier than quartz, feldspar, or other minerals, separation was usually done by washing it in sluice boxes (a method similar to gold panning but on a larger scale). Sluice separation typically yielded concentrations of magnetite ranging from 30 to 50%, depending on the type of sand and the method used.
An untrue rumor that litter boxes are being placed in schools for students who dress up in furry costumes and identify as cats has made its way to two North Carolina school districts — despite ...
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