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Key terms: air pollution black lung blasted braces brown coal coal coal is mined coal mining coal preparation coal production coal reserves coal seam coal was mined colliery contour conveyors damp deep underground excavator hard coal million tons mine roof miners mining mining methods mobile roof modern mining mountaintop mt open cast open pit overburden pillar pillar mining reclamation removing the overburden roof supports room and pillar short tons shovel south wales spoil steep terrain subsidence surface mining tons tons of coal underground mining world coal yr Search external links cited by footnotes on Wikipedia page Coal mining: |
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