A GROUND FALL (APPROX 400 CUFT) OCCURED AT THE INTERSECITON OF LINE 15 AND THE EAST RELIAF X-CUT DRIFT IN THE 7222 UNDERCUT REVELY. THE ROCKS IN THIS AREA ARE CLAYRICH (I.E. ARGILLIZED), SOFT , WEAK, FRACTURED AND WETHER THEN OTHER AREA. LINE 15 AN 8.5'X8.5' DRIFT WAS INITIALLY SUPPORTED IWTH 4' SLLIT SET BOLTS 2"" WIRE MESH AND BACK SPOTTED WITH 6' BOLTS.