EE used a hammer to strike the head of a 10"" chisel to free a stuck idler on a belt conveyor. When EE struck the chisel EE felt a sharp pain in EE's left forearm and EE's arm bled. EE was taken to the hospital where EE received treatment for a foreign body puncture (metal from the chisel head). EE received two stitches after the doctor tried to unsuccessfully to remove the metal.