Using satellite images taken by NASA between 1976 and 2005, Bernhardt and her coauthors created maps of mountaintop mining in a 12,000-square-mile region of southern West Virginia. They found that companies had converted 5% of the land to mines during this period.

via Coal Mining May Have Damaged Up To 22% Of Streams In Southern W. Virginia – 1,700 Miles Of Streams – Democratic Underground.