A ROOF FALL OCCURRED AT THE 002 SECTION #7 ENTRY, 4 CROSSCUTS INBY SS#2539 MEASURING APPROX 35'X18'X8'T. NO EQUIPMENT WAS INVOLVED. THE VENTILATION WAS NOT DISTURBED. THERE WAS NO INJURY AN D THE FALL WILL NOT BE CLEANED UP. ADVERSE ROOF CONDITIONS CONTRIBUTED TO THE FALL.