AN UNINTENTIONAL ROOF FALL WAS DISCOVERED IN THE 2ND WEST MAINS, #5 ENTRY, BETWEEN X-CUTS #6 & #7. THE FALL MEASURED APPROXIMATELY 25'Lx18'Wx6'H. IT SHOULD BE NOTED THAT A 6.3 EARTHQUAKE OCCURRED ON THE UTAH-NEVADA BORDER AT THE SAME TIME WHICH WAS FELT THROUGHOUT MOST OF THE WESTERN STATES. THE HORIZON MINE BELIVES THIS FALL WAS A DIRECT RESULT OF THE EARTHQUAKE.