Massey's Aracoma mine continues to have numerous safety violations, with 316 cited in the last year.
The Upper Big Branch, where Monday's disaster occurred, was cited for 515 violations in 2009 and 124 so far this year, federal statistics show. The company was cited, among other things, for allowing combustible coal dust to ac ulate.
Labor Department records show that before Monday, three workers have been killed at the mine in the last 12 years. A worker was electrocuted in 2003, another died after a roof collapse in 2001, and a third died when a beam collapsed in 1998.
Asked about the firm's safety record, West Virginia Gov. Joe Manchin III said Tuesday that the company was within federal safety tolerance requirements. But, he added, the firm's overall record "sure concerns me."
Between 2001 and 2005, the federal government proposed fines of $236,000 for violations at the Upper Big Branch mine, and Massey paid nearly $235,000.
Since Congress enacted tougher mine oversight regulations in 2006, the government has proposed $1.77 million in fines at the mine, but Massey has paid only about $365,000 and contested most of the difference, federal records show.