EE WAS ROOF BOLTING IN THE LONGWALL RECOVERY CHUTE FOR F-13 IN THE LEFT 3 NORTH SECTION. WHILE POSITIONING THE CENTER BOLTER TO INSTALL A 12' ROPE BOLT ON THE LEFT SIDE OF ENTRY, HE HAD HIS LEFT HAND RESTING ON THE BOLTER CANOPY. AS HE TRAMMED THE BOLTER, HE CAUGHT HIS LEFT ARM BETWEEN THE RIB AND CANOPY.