WHILE DRILLING HOLES IN ROOF TO BLAST FOR AN OVERCAST, INDIVIDUAL WAS USING A DOUBLE-BOOM LEE NORSE ROOF BOLTER. INDIVIDUAL MOVED BOOM TO REPOSITION AFTER LOWERING BOOM'S STAB JACK. THE CANOPY AND BOOM ROSE, PINCHING HAND AGAINST ROOF CAUSING A SMALL LACERATION BETWEEN 1ST & 2ND FINGERS THAT NEEDED STITCHES ON RIGHT HAND.