EE AND OTHER EE WERE ATTEMPTING TO DISLODGE A LARGE ROCK FROM THE HOPPER, AS EE STEPPED DOWN INTO IT. HE CAUGHT HIS BOOT TOE, TRIPPING HIM FORWARD AND TWISTING HIS RIGHT KNEE. ALL ELQUIPMENT W AS SHUT DOWN BEFORE THEY ENTERED THE HOPPER. 12-7-01 EE ASKED TO SEE A DR THE KNEE WAS STILL PAINFUL SWOLLEN AND BRUISED HE SAW DR BALL X RAYED THE KNEE TOLD HIM TO TAKE IT EASY AND COME BACK