TWO BEARING CAPS HAD BEEN REMOVED FROM THE CRUSHER/JAW. THEY WERE PLACED ON A PALLET. THE MINER WAS ASSIGNED TO CLEAN THE CAPS IN PREPARATION TO PUT IN NEW BEARINGS AND GREASE. AS HE WAS TURNING ONE OF THE CAPS OVER TO CLEAN IT, IT SLIPPED WHILE HE WAS HOLDING IT OVER STRIKING HIS RIGHT HAND BETWEEN THE TWO CAPS.