The assistant to the mine boss, Tom Callaghan, was among a group of sixteen men who had worked together to erect a cloth brattice approximately 500 ft from the flame zone.

[3] In the early hours of the crises that ensued, volunteers from nearby coal mines in Greene, Fayette, and Washington counties rushed to Mather to provide aid, as did trained rescue crews from the U.S. Department of Mines in Pittsburgh.

[4] It was quickly discovered, however, that the extent of the devastation was far-reaching, and many in the small mining community began to lose hope when it was reported on the night of May 20 that the bodies of Callaghan and his men had been brought to the surface.

[3] Subsequent investigations as well as reports from survivors suggest that the incident was the result of a methane gas and dust explosion that was triggered by an arc from a battery-powered locomotive being operated in the affected area.

[5] A total of 279 men were estimated to have been underground at the time, 209 of whom were in the affected area when the gas-dust mixture ignited.