Surface mining

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placer mining | Britannica Mining Engineering, Gold Mining Equipment, Surface Mining, Petroleum Engineering, Gold Prospecting, Geology Rocks, Mining Equipment, Metal Detecting, Gold Mining

Placer mining, 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 out from rapidly moving streams and rivers at points

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Mountaintop removal mine in southwest Virginia. Courtesy of Southwings. Kentucky Mountains, Surface Mining, Chemical Waste, Volunteer Activities, My Old Kentucky Home, Kentucky Home, Advantages And Disadvantages, Economic Growth, Coal Mining

Mountaintop removal evolved in the 1970s from conventional strip mining techniques and is increasingly popular with coal companies because it allows them to access thinner seams of coal using only a fraction of the workforce required for underground mining operations. Photo of a mountaintop removal operation in southwest Virginia courtesy of Southwings, www.southwings.org.

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