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element of practical coal minng

Surface mining - Wikipedia, the free encyclopedia

"Mountaintop removal mining" (MTR) is a form of coal mining that uses explosives to blast "overburden" off the top of some Appalachian mountains.

Iron ore - Wikipedia, the free encyclopedia

Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in color from dark grey ...