HOISTMAN CAME TO THE MINE AT 2100 TO DO PRESHIFT CHECKS FOR GRAVEYARD SHIFT WHICH STARTED AT 2300. HE STARTED TO DO HIS HOIST CHECKS WHEN #2 HOIST KICKED OUT. IT WAS RESET AT 2210 AFTER CLEANI NG CONTACTS & PERFORMING HOIST CHECKS. THE HOIST KICKED OUT AGAIN & WAS RESET. ELECTRICIAN & HOISTMAN WERE IN HOIST GOING UNDERGROUND WHEN IT KICKED OUT AGAIN. THEY WERE TRAPPED FOR ABOUT 45