Support WBURMine Citations Focus on Ventilation, Fire, ElectricityPlay05:17Download AudioRobert BenincasaJuly 21, 2010 ShareMine ventilation issues are critical to running a safe coal mine. Here, a rescuer walks through a blocked tunnel in the Crandall Canyon Mine, northwest of Huntington, Utah, where six coal miners were trapped in 2007. (AP)
