Coal mining has made a comeback in some regions in the early 21st century because of the increased prominence of Consol Energy , based in Pittsburgh . The Quecreek Mine rescue in 2002 and continuing mine subsidence problems in abandoned coal mines in western Pennsylvania as well as the Sago Mine disaster and Upper Big Branch Mine disaster in West Virginia and other regions have also been highlighted in recent times
Upper Big Branch Mine disaster
Upper Big Branch Mine disaster
Appalachia