A roof fall was found 2 breaks inby spad 24605 between the track and intake entry. The fall measured 80' L X 20' W X 7' H. and occurred due to a rider seam above the immediate roof. Roof anchorage in the area was 4 foot resin bolts. No persons were injured as a result however, ventilation was affected. The fall was dangered off and ventilation was re-routed around the fall.