ON FRIDAY MORNING AT 9:15 AM A ROCK BURST OCCURRED ON THE 5500 LEVEL IN THE 31 STOPE. THE MAIN EPICENTER WAS APPROXIMATELY 250 FEET EAST (STRAIGHT AHEAD) AND 64 FEET BELOW THE 31 EAST STOPE. SLIGHT DAMAGE ACCURRED IN THE STOPE, ONE SHIFT OF SCALING AND BOLTING WAS REQUIRED TO PUT THE STOPE BACK INTO NORMAL OPERATION. THE MSHA FIELD OFFICE IN BOISE WAS NOTIFIED.