But SNL Energy said its review of the SEC filings found "the data was not unreasonably skewed by violations at Upper Big Branch alone" and that Massey "accumulated a high number of safety violations at many of its mines."
Massey did not respond to a request for comment.
Also this week, MSHA made public copies of the citations issued by its inspectors as part of an audit of compliance with injury and accident reporting requirements at Upper Big Branch.
MSHA regularly conducts such audits following major mining accidents. Agency officials have previously disclosed the existence of the citations and some general information about them, but had not made the documents available until Monday.
The records show that Massey did not report to MSHA as required the fact that four Upper Big Branch workers did not return to work after the April 5 explosion.
At least one worker from the mine has told a congressional committee he has been unable to return to work because of emotional problems caused by the mine disaster.
Reach Ken Ward Jr. at kw...@wvgazette.com or 304-348-1702.