While conducting his weekly examination a fireboss identified a roof fall in the Left return #1 entry of Detour Mains at brk #84 near spad #163.The fall measured approx. 120'L X 20'W X 4'H the area was supported with 4' fully grouted resin bolts and mined approx.7-2010. The fall will not be cleaned up and the area has been dangered off and timbers set.