Placer mining | Britannica

Placer , ancient method of using water to excavate, transport, concentrate, and recover heavy minerals from alluvial or placer deposits. Examples of deposits mined by means of this technique are the gold-bearing sands and gravel that settle …

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  • In Situ Mining Research - Arizona

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  • In-situ or Ex-situ Treatment and Soil Remediation: Whats ...

     · Given the situation, in- or ex- treatment and remediation may make the most sense. 1. In- bioremediation: In this process, the bioremediation takes place in the subsurface like the groundwater or soil. Some advantages of this type are lower costs, total elimination of the contaminants, and lower risk factor to those around it.

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     · In- Tests on Soil. In testing is a division of field testing corresponding to the cases where the ground is tested in-place by instruments that are inserted in or penetrate the ground.In- tests are normally associated with tests for which a borehole either is unnecessary or is only an incidental part of the overall test procedure, required only to permit insertion of the …

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