CREW WAS DRILLING A ROOF BOLT HOLE INTO MINE ROOF ALONG A NEW SLOPE. THE VIBRATION CREATED BY DRILLING CAUSED THE BOLTER TO CREEP A LITTLE DOWN THE SLOPE. THIS CAUSED THE STEEL TO BEND AGAINST SIDE OF HOLE. WHEN ATTEMPTING TO ADD A 2' EXTENSION OF DRILL STEEL EE'S FINGER GOT CAUGHT BETWEEN DRILL STEEL AND MINE ROOF AT COLLAR OF HOLE CAUSING INJURY. STARTED MISSING 5-7-03.