Early on April 5, 2010, in the heart of West Virginia coal country, a huge explosion killed 29 workers at Massey Energy’s Upper Big Branch Mine. Later that day, President Obama directed Labor Secretary Hilda L. Solis to conduct “the most thorough and comprehensive investigation possible” and to work with the Justice Department to investigate any criminal violations.

On Tuesday, the Labor Department issued a 972-page report on the calamity — the nation’s worst mining disaster in 40 years. It concluded that Massey’s “unlawful policies and practices” were the “root cause of this tragedy.” It identified over 300 violations of the Mine Safety and Health Act, including nine flagrant violations that contributed to the explosion.

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