The U.S. Department of Labor’s Mine Safety and Health Administration announced today that, as of Dec. 31, 2013, the agency had addressed the 100 recommendations published in a March 2012 internal review report, meeting the specific timetables and deadlines it had set for implementation of each recommendation. That report examined the agency’s actions in the months leading up to the April 2010 Upper Big Branch mine explosion, which killed 29 miners, injured two and led to sweeping changes in mine safety.