What is Mine Subsidence?
6:25
Abandoned Mines are Dangerous!
27:33
The Avondale Mine Site - Worst Disaster In Anthracite History
10:38
Introduction to Coal in Pennsylvania
7:32
Why Coal Breakers were Horrific Places to Work (Coal Breakers Explained)
20:44
UPDATE on Underground Mine Subsidence Glen Lyon PA Sinkhole
16:59
Blasting in Underground Mines
20:47
Putting the rebuilt highwall miner to work.
13:42