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Jun 13, 2014· Abstract Large-scale sand extraction from river environment for building constructions is a global phenomenon Indiscriminate sand mining imposes a series of physical, ecological, and socio-environmental impacts on the river basins...

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Dredging can be done to recover materials of commercial value; these may be high value minerals or sediments such as sand and gravel that are used by the construction industry Dredging is a four-part process: loosening the material, bringing the material to the ,...

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Gold deposits along the general gold path can be small or large, depending upon the size of the gold trap The most important type of gold trap in river mining is called the “pay-streak” Pay-streaks always form along the gold path where the river’s flow slows down on a large scale during a major flood storm...

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Using a dredge, an (experienced) operator is able to process a much larger volume of streambed material than with any other small-scale hand-mining apparatus Most of the gold-bearing river-bottom streambed material is sucked up as quickly as the operator is able to feed it into the suction nozzleRocks that are too large to pass through the suction nozzle are moved out of the way by hand...

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Jun 13, 2014· Abstract Large-scale sand extraction from river environment for building constructions is a global phenomenon Indiscriminate sand mining imposes a series of physical, ecological, and socio-environmental impacts on the river basins...

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