Government investigators have cited Massey Energy for failing to report more than 20 accidents at its Upper Big Branch coal mine in the two years before an April explosion killed 29 miners there.
The federal Mine Safety and Health Administration posted copies of the citations on its website Tuesday.
Four citations accuse Massey of failing to report that miners were forced to miss work because of the explosion, but most of the alleged violations predate the blast. Among other things, MSHA alleges Massey failed to report nine accidents serious enough to force miners to miss work and that two workers contracted black lung disease.
Virginia-based Massey says it's reviewing the citations.
The explosion remains the subject of criminal and civil investigations.
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