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Longwall mining - WikipediaLongwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6 – 1.0 m thick). The longwall panel (the ...
Coal - Western Oregon UniversityCoal . Coal has a long history of use as an energy source. It was the fuel of the industrial revolution and although many other energy sources have replaced some ...
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