The Diamond No. 2 Mine was located in the Wilmington Coal Field near the border between Will and Grundy counties, Illinois, and was operated by the Wilmington Coal Mining & Manufacturing Company. The mine had been in operation since at least July 1881. The mine had 3 shafts, the main shaft, an air shaft near the collapsed part of the mine and an air/escape shaft, just west of the main shaft. It is estimated that between 200 and 400 men and boys were regularly employed in the mines. The miners lived in Braidwood,
Diamond, Illinois, and other nearby communities in Grundy and Will counties in Illinois. ==Disaster==