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Like a sluice box, the rocker box has riffles and a carpet in it to trap gold. It was designed to be used in areas with less water than a sluice box. The mineral processing involves pouring water out of a small cup and then rocking the small sluice box like a cradle, thus the name rocker box or cradle.
A long sluice box runs along the mine. [16] The sluice box was used extensively during the California gold rush for larger scale operations. When streams became increasingly depleted, the grizzly and undercurrent variants of the sluice box were developed. The grizzly is a set of parallel bars placed at a 45-degree angle over the main sluice box ...
A rocker box uses less water than a sluice box and is well suited for areas where water is limited. A rocking motion provides the water movement needed for the gravity separation of gold in placer material. [45] Rocker boxes gained popularity during the California Gold Rush in the 19th century and remain in use today.
Sluice boxes are often used in the recovery of black sands, gold, and other minerals from placer deposits during placer mining operations. They may be small-scale, as used in prospecting , or much larger, as in commercial operations, where the material is sometimes screened using a trommel , screening plant or sieve.
Small amounts of gold have been found in streams draining glacial deposits in the Midwest. Gold prospecting and mining activities allowed on public lands vary with the agency and the location. Gold pans and shovels are commonly allowed, but sluice boxes and suction dredges may be prohibited in some areas.
A faster way was by a rocker box or by sluicing. Dirt was filled into the box or sluice together with water and rocking movements or gravity would make the gold particle go to the bottom whereas sand and fine gold particles would flow off with the water.