A FALL OF ROOF OCCURRED IN THE 1ST SOUTH WEST SUBMAINS IN THE #1 ENTRY AT X-CUT #10. THE FALL WAS APPROX 6 1/2' HIGH 54' LONG 19' WIDE AND THE APPARENT CAUSE WAS AN UNDETECTED SLIP. THE AREA WAS SUPPORTED WITH 6' FULLY GROUTED BOLTS AND 2 PROP SETTERS.