A former superintendent at a West Virginia coal mine where an explosion killed 29 workers has been sentenced to nearly two years in jail. Gary May had pleaded guilty to conspiracy to defraud the U.S. government, admitting his role in tipping off miners about safety inspections, falsifying records and disabling a methane detector. Regulators found Massey Energy failed to uphold basic safety standards at the Upper Big Branch Mine, allowing the buildup of coal dust in the mine, which was ignited by a spark from faulty equipment. The 2010 explosion marked the worst coal-mining disaster in 40 years in United States.