UNPLANNED ROOF FALL OCCURED IN THE LAST ROOM PANEL ON 4 RIGHT IN BY SPAD #2244 IN #3 ENTRY AND TRAVELED INTO INTERSECTION OF #2 ENTRY. FALL APPROX 12-16' WIDE AND 60' LONG AND 3 1/2-4' HIGH. DID NOT AFFECT ANY EQUIPMENT. FALL WILL NOT BE CLEANED UP. IT IS IN OLD WORKS. FALL IS TIMBERED AND DANGERED OFF