THE #2 LOADER WAS BROUGHT INTO THE SHOP BECAUSE OF AN UNUSUALLY LARGE AMOUNT OF BLACK SMOKE COMING FROM THE EXHAUST. WHEN THE LOADER WAS STARTED IT BAGAN TO INCREASE IN RPM'S AND EXHAUSTING A LARGE AMOUNT OF BLACK EXHAUST INTO THE SHOP. AT THIS TIME ALL PERSONNEL IN THE SHOP AREA EVACUATED TO THE FRESH-AIR SIDE OF THE SHOP'S VENTILATION DOOR. BY 1:45 AM ALL 9 MINERS WERE IN FRESH