The effect of the united mine workers of America on the probability of severe injury in underground coal mines

This paper examines the efficacy of the United Mine Workers of America (UMWA) in achieving safe working conditions by reducing the probability of severe injury. A detailed data base has been constructed for underground mines during the period 1986–1988. The results obtained fail to provide convincing evidence that the UMWA reduces the severity of injury, even though the UMWA has safety committees and inspectors in the mines where it is the bargaining agent. Further testing reveals that there is no significant difference in the probability of injury due to roof falls, haulage, and handling material, between union and nonunion mines.