THE INJURED WAS OPERATING THE TRACK MOUNTED BATTERY MANTRIP INTO THE MINE. AT 28 BLOCK ON THE MAINS TRACK THE CANOPY OF THE MANTRIP STRUCK THEMINE ROOF CAUSING A ROCK TO FALL ONTO THE INJURE DS LEFT LEG AND FOOT. THE ROCK MEASURED 10""X 12""X 4"" THICK. RESULTED IN BRUISES TO THE LEFT KNEE AND LEFT FOOT.