A SUMP WAS FULL OF SLIME AND REQUIRED CLEANING. THE WET MUCK WAS REMOVED AND PLACED IN THE REMUCK. THE MATERIAL WAS THEN TRANSPORTED TO THE 4100 LOADING POCKET. WHEN THE SLIME WAS DROPPED DOWN THE GRIZZLY INTO THE SKIP, THE IMPACT CAUSED THE SKIP TO BEND THE GUIDE SHOES, ALLOWING THE SKIP TO SLIDE BACKWARDS AND DOOR TO OPEN. THE SKIPTENDER NOTICED DOOR OPEN & HAD HOISTMAN STOP SKIP