WHEN THE DRIFT CREW ARRIVED FOR SHIFT ON MON MORN, 4/3/00 THEY NOTICED THAT THE HEADING ON 5500-54EAST HAD ROCKBURST. SINCE THE CREW WAS OFF FOR THE WEEKEND THE ACTUAL TIME OF THE EVENT IS UNK NOWN. THE DAMAGE WAS CENTERED IN THE HANGING WALL TOWARDS THE FLOOR OF THE DRIFT. THE DAMAGE WAS APPROX 35'L X 5'H OFF THE FLOOR. SOME LOOSE GROUND WAS OBSERVED IN THE BACK BUT THIS APPEARED