Unplanned roof fall @ xc #79 1/2, entry #1, 5-L beltline. Fall occurred in the pillar line between xc #79 and xc #80 area was supported with 7' TR bolts and 100 ton heizman jacks with cross bars. Fall dimensions - 30 ft. long, 19 ft. wide, 8 ft. high. Fall did not cause injury, inpair ventilation, or intrap miners. Fall area developed 02/11/2017 to 02/13/2017