ROOF FALL (7000-1-004-06) : LOCATION - Old Main West Left Return, #89 Crosscut, Entry #5. DIMENSIONS - H:6-7', W:23', L:22'. GEOLOGY - Soft, medium to dark gray shale with prominent roof jointing or slips in roof. ROOF SUPPORT : 6' Conventional bolts. The area was mined in November 1987. Prominent roof jointing in the roof were the apparent cause for the fall.