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Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef or placer deposit.These deposits form a mineralized package that is of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay.

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Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef or placer deposit.These deposits form a mineralized package that is of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay.

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list of machinery used in open cast coal mining. Coal mining - Wikipedia, the free encyclopedia Coal-cutting machines were invented in the 1880s, In Canada (BC), Australia and South Africa open cast mining is used for both thermal and metallurgical coals, Historically, coal mining has been a very dangerous activity and the list of . [7/27 Online]

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Coals mines use surface mining for coal deposits buried less than 200 feet underground In this type of mining, giant machines remove top-soil and layers of rock to expose large beds of coal After coal extraction, the topsoil is replaced so that the area can be reused for croplands, wildlife habitats, recreation or offic

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