DURING THE DUMPING CYCLE A ROCK LODGED IN THE GATE MECHANISM OF #2 SKIP, CAUSING THE SKIP GATE TO LODGE AGAINST THE SHAFT DUMP ASSEMBLY. THE SKIP HAD TO BE MANUALLY EMPTIED TO FREE THE SKIP GATE. NO DAMAGE OCCURRED TO THE SKIP OR SHAFT AS A RESULT OF THE INCIDENT. MSHA NOTIFICATION WAS MADE IMMEDIATELY.