An unplanned roof fall in #2 & #3 room on 2nd south butt 80' inby spad #4846. The fall was about 50' long x 20' wide in both rooms & crosscut 3-2 room. the highest part of the fall is 12'-14' high. The rooms were bolted with 42"" fully grouted resin bolts until we encountered sub normal roof in the #2 room. We rebolted outby the sub normal roof with 6'-8' install #2 bolts.