A MINE FIRE WAS DISCOVERED AT OR NEAR THE CONVEYOR BELT SLOPE ENTRY NEAR THE BOTTOM OF THE SLOPE. NO ONE WAS UNDERGROUND WHEN SMOKE WAS DISCOVERED COMING FROM THE MINE. FIREFIGHTING ACTIVITIES HAVE BEGUN AND ARE CONTINUING. THE TIME OF THE ACCIDENT IS THE APPROX. TIME SMOKE WAS DISCOVERED. NO ONE WAS SCHEDULED TO WORK ON THIS SHIFT.