THE EMPLOYEE STATED HE WAS MOVING A ROLL OF 3"" PLASTIC WATER LINE OUT OF THE ROADWAY WHEN IT GOT CAUGHT ON THE ROOF. HE LOOKED UP TO SEE WHAT THE LINE HIT AND A PIECE OF ROCK DISLODGED AND STRUCK HIM ON THE NOSE. THE ROCK WAS 7""X9""X1"". HE SUSTAINED A SCRATCH ON HIS NOSE. THIS IS BEING REPORTED TO MSHA TO ABATE CITATION 7244154 WHICH THE OPERATOR INTENDS TO CONTEST