PANEL 11D IN STOPPING AREA HAD BEEN PREVIOUSLY REMOTE MINED AND WAS IN THE PROCESS OF BEING SANDFILLED. THE HANGING WALL OF THE MINED PANEL HAD STARTED SLOUGHING DURING THE PROCESS. ON 2-9-04 EE'S NOTIFIED SUPERVISION THAT THE BOLTED PORTION OF THE HANGING WALL HAD FAILED. EE'S WERE REMOVED AND THE AREA BARRICADED.