Boston GlobeAuthorities Vow to Close Mines Found to Be UnsafeNew York TimesWASHINGTON — Federal regulators told Congress on Tuesday that they would become more aggressive in enforcing mine safety laws, vowing to close mines with repeated safety violations and shut down sections of mines when inspectors find ...Safety chief details West Virginia coal mine's history of violationsWashington PostHow 2006 Mine-Safety Law Led to 'Broken' US Regulation SystemBusinessWeekUS Government to Step Up Mine Safety EnforcementVoice of AmericaUSA Today -CNN -NPRall 1,221 news articles »