A roof fall occurred in the 1 Main East in #5 entry in the intersection of cross-cut #23 and extending through the pillarline for 20ft. toward #6 entry measuring 18ft. wide x 40ft long. x 8ft. high. The area was supported with 6ft. tension rebar bolts and 9ft. mega bolts. An undetected slip was determined to be the cause of the fall. This area was mined in April 2004.