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Key terms: mining coal surface mining removal mineral mountaintop areas reclamation seam excavator environmental overburden rock mountaintop removal form coal seam united states land reclaimed near sites fills appalachian feet sludge earth contour machine waste method virginia valley fills required sand topography deep coal mining dredging commonly extract impact better cut overlying above soil flat outcrop biodiversity mtr kentucky streams Search external links cited by footnotes on Wikipedia page Surface mining: |
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