Unplanned roof fall @ in #2 entry, ft. 1536 on the 4-L unit MMU-004. Fall occurred inby the intersection at + 1536 supported with 8' TR bolts. Fall dimensions 17"" wide by 20"" length x 8.5"" to 9 ft. high. Fall did not cause injury, impair ventilation or entrap miners. Fall area developed the week of March 21, 2016.