FALL OF ROOF OR BACK at Blackjewel L.L.C.
An unintentional roof fall occurred on the # 18 belt drive inby the 002-0 section. The fall was from 0 to 12' high, 22' wide at the widest point and approx. 20' long. The roof fall is measured from the roof ""not the floor"" to the apex of the fall.
U.S. Mine Safety and Health Administration