Ground sluicing utilises the erosive power of flowing streams of water in open channels to process material broken by hand and is one of the oldest methods of mining. Conventional practice is to construct a dam across the watercourse above the section to be mined and to channel the water along flumes cut into the pay gravels. Material shovelled in from the sides is broken up and slurried manually to release the values. The gold is recovered behind riffles in wooden sluice boxes that arc given gradients of 112 to 110 or steeper.
In larger-scale operations where much fine gold is present, a ground sluice may be sectionalised with the downstream sections acting as scavengers. The slurry flow is stopped and the water is diverted back into the main stream when gold first appears in the final sluice section. The boxes arc then cleaned out and the gold is recovered by panning. Periodically, when shovelling distances become excessive, a fresh sluice is dug closer to the foot of the receding bank. The procedures arc repeated as necessary until all of the gold-bearing wash has been mined.
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Cannot be avoided. The best hydraulic section has width greater than height a common W.H. ratio is 21. Smirnov 1962 lists critical channel flow velocities for different sized materials.
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Ground sluicing was practised widely in early Roman times. Army engineers of the day recognised that a natural head of water could be utilised to supply energy at the working face, so streams of water were channelled for great distances in mountain areas to gold mines on which much of the prosperity of Rome depended. The method, first described by Pliny the Elder in relation to gold mining in Spain during the first century AD employs a dam which fills slowly and is periodically breached when full. The water is then directed through flumes to the pay gravels.
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Early miners used a different form of ground sluicing to mine surface exposures of gold-bearing conglomerates. The ground surface in this area was traversed by herringbone patterns of channels radiating out from single channels located in the lowest parts of the terrace. These channels acted as tributaries to collect large volumes of water running off from higher ground during heavy monsoon rain periods. The flow from these channels was directed into a central channel, which cut back into the sluicing face dislodging material for treatment in ground sluices.
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Suitable ground conditions for hydraulic sluicing arc provided by small gravelly wash that is easily slurried and soft weathered bedrock in which racescan be cut to direct the slurry from the face to a head feed pump sump. A natural slope of about five degrees from the horizontal is an optimal gradient but slopes may be 30-40 flatter or steeper without seriously affecting the operation. At any such gradients, most of the slurried material gravitates from the face to the sump without excessive surging or settling out of the finer gravels.
The monitor unit, or hydraulic giant as it is sometimes called, is a nozzle for directing a stream of high-pressure water against the working face. Some larger units incorporate deflectors to give a better control of jet direction. Various degrees of sophistication arc applied to balancing the re-active thrusts developed by the jet, the simplest being counterweights attached to the arm.
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At the very dawn of the Gold rush to California, the rocker box was perhaps the most used piece of gold prospecting equipment. For a time it was perhaps even more important that the gold pan. Mostly this was because the miner could make a rocker for himself in.
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