WHEN MINER NOTICED MOVEMENT IN THE SHOULDER OF DRIFT AND ATTEMPTED TO BAR OUT MATERIAL. WHEN UNABLE TO REMOVE MATERIAL, BARRICADED AREA, FOUND SUPERVISOR FOR PERMISSION TO BLAST OUT. WHEN SUPERVISOR ARRIVED WITH MINER AT SCENE, SOME MATERIAL HAD FALLEN AROUND GROUND SUPPORT AND CONTINUED TO SLOUGH UNTIL REACHING BEYOND EXISTING GROUND SUPPORT.