AN ESTIMATED 700 TONS OF MATERIAL WAS DISPLACED FROM THE BACK OF THE 29 N SILL 1600 L. FAILURE STARTED IN AN UNSUPPORTED ROUND BLASTED 2 DAYS BEFORE. THE FAUKYRE STARTED WITH THE RIBS SLOUGHIN G, THUS ALLOWING THE BACK TO EVENTUALLY UNRAVEL. ESTIMATED VOLUME 20' BY 10' LONG BY 10' HIGH. PROGRESSION PAST FIRST ROW OF 16' SWELLEX INSTALLED IN 29/20 NORTH SOUTH SILLS INTERSECTION.