Massey Energy CEO Found Guilty of Willingly Violating MSHA Standards

The April 5, 2010, West Virginia mine explosion that killed 29 workers was one of the worst U.S. mine disasters in decades.
The explosion occurred at the Upper Big Branch South Mine — operated by the Performance Coal Company, a subsidiary of Massey Energy. It was ignited by an unknown source with high methane levels being a contributing factor. Investigators faulted Massey Energy for failure to properly maintain its ventilation systems, which allowed methane levels to increase to dangerous amounts.

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