In November 2010, Bruce Maggard called up to the top at an underground coal mine in Perry County to alert them that a car was coming back up the mine shaft. AI-generated summary reviewed by our newsroom. Read our AI Policy. Federal delays left Central Appalachian mines exposed to high silica dust levels in 2025. MSHA data and ACLC analysis show about 20% of U.S. mines exceeded silica caps. Clinics report rising complicated black lung cases and younger patients in Appalachia.