Although the ability to designate pattern violators has been on the books since 1977, Main said it wasn't used until 2010, after 29 miners died in an explosion at Massey Energy's Upper Big Branch mine in southern West Virginia.That year, MSHA identified 53 mines for review, labeled 17 potential violators and put two on the POV list.
W.Va. Mine Where 2 Died Listed As Pattern Violator
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