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Underground Coal Mining Pictures Coal Mining And Geology

241 coal resource geology 28 242 coal types and uses 28 243 coal seam methane 29 25 coal mining operations 29 251 historic mining 29 252 current mining 30 253 future development potential 30 254 underground coal mining systems 32 2541 bord and pillar mining 32 2542 pillar extraction 32 2543 longwall mining 33 3 socio.

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