DURING THE CENTRALIZED BLAST BETWEEN SHIFTS THE HANGING WALL OF THE 20 L STOPE BETWEEN 1750L AND 1825L FAILED. THE FAILURE ID ASSOCIATED WITH A MUDSTONE LOCATED IN THE HANGING WALL. A MINIMUM VOLUME OF 20 FT HIGH BY 40 FT WIDE WAS DISPLACEDABOVE THE 1750L. NO ONE WAS IN THE MINE AT THE TIME AND THERE WAS NO DAMAGE TO VENTILATION OR EQUIPMENT.