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Illinois faces ongoing mine subsidence risk across counties
Illinois experts describe two subsidence forms pit and sag with pits 10 to 12 feet across forming quickly over shallow mines and sag depressions 350 to 450 feet wide over deeper workings. IDNR teams brace homes where needed and fill pits to halt erosion while planners weigh longwall versus room and pillar mining, noting no reliable age trend for subsidence.
MENTIONED IN THIS ARTICLE
Bob Gibson
Illinois Department of Natural Resources
Gibson
IDNR
IDNA
Scott Elrick
Illinois State Geological Survey
Elrick
Illinois