EMPLOYEE WAS BRINGING A LOAD OF COAL FROM THE HAZY SEAM. ON HIS WAY UP THE HILL, HE HEARD A POP SOUND FROM THE BACK OF THE TRUCK AND THE TRUCK STOPPED PULLING. HE THEN HEARD ANOTHER POP SOUND, THE TRUCK ROLLED BACKWARD ABOUT 35 FT AND HIT THE HILLSIDE BERM AND OVERTURNED ON DRIVERS SIDE. HE WAS TRANSPORTED BY AMBULANCE TO HOSPITAL