A NEW ROOF FALL OCCURRED ON THE A MAIN TRACK, 5 X CUTS IN BY THE SLOPE BOTTOM AT THE 2 SOUTH TRACK SWITCH. FALL IS APPROX 25' LONG BY 6' HIGH BY19' WIDE. AREA WAS WAS BOLTED WITH SEVEVRAL TYPE S OF BOLTS AND PLANKED. FALL IS NOT OBSTRUCTING VENTILATION.