GROUND FALL IN 5630-307 TOP CUT. TWO MEN SHOT THEIR ROUND AT 3:15 PM ON 9/28/00 AND RETURNED TO THE HEADING TO BAR DOWN AND RAMP TO BOLT. THE HEADING THEN SAT IDLE UNTIL 10:00 AM ON 9/29/00 WH EN THE SAME TWO MEN RETURNED TO FIND THAT THE OPEN GROUND HAD WORKED ABOVE AND THROUGH THE EXISTING GROUND SUPPORT.