Environmental Hazard And Limestone Extraction

Gold has also been found near the sheyenne river, and is found within cemented gravels. the source of this gold comes from the black hills in south dakota, one of the richest gold regions in the world.geologists believe that the gold bearing gravels were covered by deep layers of glacial sediment during the last ice age, and the gold bearing gravels are those that have been exposed by erosion ...

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