A roof fall occurred in the 15 North Panel #10 entry in the intersection of cross-cut #23 and extending through the pillar line toward #9 entry measuring 50ft. x 20ft. x 6ft.- 9ft. The area was supported with 5ft. fully grouted bolts and 9ft. mega bolts. An undetected slip was determined to be the cause of the fall. The area was mined in August 2006.