From the abstract: At approximately 12 noon (CST) on December 8, 1981, an explosion occurred in 003 Section of the No. 21 Mine of Grundy Mining Company, Inc. There were 56 men in the mine when the explosion occrred, 13 of whom were killed by or died from the results of the explosion. The other 43 men survived the explosion and, except for 6 men who remained underground and participated in the recovery operations, escaped to the surface. The explosion occurred when one of the victims us ed a cigarette lighter in an explosive methane-air mixture that accumulated as a result of inadequate ventilation in 003 section.