A ROCK FALL WAS DISCOVERED IN THE #5 ENTRY ONE CROSSCUT INBY SPAD #1550. THERE WERE NO INJURIES AND THE TRAVELWAYS AND AIRWAYS WERE NOT AFFECTED. THE FALL MEASURED APPROXIMATELY 1 FT TO 7 FT HIGH, 18 FT WIDE AND 50 FT LONG. IT APPEARED TO BE A SLICK SIDED ROCK.