A ROOF FALL OCCURRED ON THE 1L4W PANEL AT X-CUT 5-6 IN ENTRY #6. THE CAUSE OF THE FALL WAS WEAK LAMINATED SHALE. THIS WAS ASSOCIATED WITH AN UNDETECTED SLIP. WE ARE NOT SURE OF THE EXACT TIME OF THE FALL, IT WAS FOUND DURING OUR WEEKLY AIR-COURSE EXAMINATION.