Coal Impoundment Location and Warning System: This government website coalimpoundment.org no longer exists. Here is a slideshow that explains what it was to do, and that does include some maps.
NAS: Coal Waste Impoundments, Risks, Responses, and Alternatives (2002; free pdf at this site)
Coal Waste Dams and Impoundments: Includes listings of impoundments in your area.
REPORT OF INVESTIGATION:
Surface Impoundment Facility Underground Coal Mine
Non-injury Impoundment Failure/Mine Inundation Accident
October 11, 2000
Big Branch Refuse Impoundment
Martin County Coal Corporation
Inez, Martin County, Kentucky