A THYRISTOR WENT OUT IN THE SILVER SHAFT HOIST. THE HOIST WAS DOWN FOR APPROX. 1 HOUR. THE #2 SHAFT HOIST WAS READY TO GO FOR EVACUATION OF 6 PEOPLE UNDERGROUND. THE SILVER SHAFT HOIST WAS REPAIRED BEFORE EVACUATION STARTED. WE DID NOT HAVE TO EVACUATE THE MINE.