SUPERVISOR WAS IN THE PROCESS OF HOOKING UP A DRAW BAR TO SCOOP. MECHANISM TO KEEP FINGERS AWAY WAS BROKE. SCOOP MOVED CAUGHT FINGERS WITH PIN WHEN SCOOP MOVED UNEXPECTLY. CAUSE OF INJURY WAS PLACING FINGERS BETWEEN MOVING PARTS. COMPLIANCE WITH RULES OR REGS A FACTOR, PROTECTIVE EQUIPMENT NOT ADEQUATE, MINER PROFICIENCY A FACTOR, MINING EQUIPMENT A FACTOR.