MINER WAS PRYING A VIBRATORY HOPPER WITH A BAR TO REMOVE ROCKS. MINER WAS STANDING ON A LOOSE MOUND OF DIRT WHEN THE BAR SLIPPED CAUSING MINER TO LOSE FOOTING. MINER WAS WORKING INSIDE THE CRUSHER HUT STRUCTURE AND TRIED TO STEP THROUGH FRAME ONTO LOOSE MATERIAL AND FELL. MINER STRUCK CHEEK AND CHIN AGAINST THE STRUCTURAL STEEL.