HOISTMAN WAS LOWERING A DRILL BASKET WITH THE #2 BUCKET & RAISING MUCK WITH THE #1 BUCKET. THE TOPLANDER WAS CONTROLLING THE DUMP CHUTES FROM THE COLLAR SWITCH BOARD. TOPLANDER CLOSED THE #2 DUMP CHUTE, INSTEAD OF THE #1 CHUTE. THE #2 DUMP CHUTE CLOSED ON THE WIRE ROPE CABLE WHILE THE DRILL BASKET WAS BEING DELIVERED TO THE BOTTOM OF THE SHAFT. CHUTE PINCHED CABLE INTO HEADFRAME