ROCK WAS HUNG UP ON SIDE OF CRUSHER. EE PUT A CABLE AROUND ROCK & JAW CRUSHER OPERATOR WAS BRINGING THE 12 TON HOIST OVER TO LIFT ROCK WHEN IT DROPPED APPROX 3 FEET INTO CRUSHER. EE SLID OFF R OCK & ATTEMPTED TO CATCH HIMSELF WITH HIS ELBOW ON SIDE OF CRUSHER OR WALKWAY & HYPEREXTENDED HIS SHOULDER. EE STARTED LOSING TIME ON 7/22/02.