A ROOF FALL OCCURRED IN THE 6-LEFT MAIN HAULAGE WAY. FALL MEASURED 20' X 70' X 23'. AREA WAS BOLTED WITH 6', 16' & 24' RESIN BOLTS. DETERIORATION TO THE STRATA FROM WATER, AIR AND POSSIBLE MOV EMENT CONTRIBUTED TO THE FALL. ALL PERSONS CHECKED IN THE MINE WERE ACCOUNTED FOR. WORK IS LIMITED TO THE CLEAN-UP AND SUPPORT OF THE FALL AREA.