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dredging is an excavation activity usually carried out underwater in shallow seas or freshwater areas with the purpose of gathering up bottom sediments and widening this technique is often used to keep waterways navigable and

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the oak of the golden dream sits beside a quiet stream in what is now known as placerita canyon it was here that gold was first discovered in california clinging to the roots of some wild onions dug up one march afternoon by

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a motorized dry-washing machine is excellent for the production demands of a one or two-person operation under ideal conditions it is able to process up to about a ton of raw material per hour which is the equivalent of what a

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surface mining is forms of mining in which the soil and the rock layer the mineral deposit are removed it is the other way of insubordinate mining in which the overlying rock is left behind and the required mineral deposits are

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