DURING #2 SKIPS LOADING CYCLE, A ROCK LODGED IN THE SKIPS GATE PREVENTING IT FROM CLOSING PROPERLY. THE PARTIALLY OPEN GATE LODGED AGAINST THE LOADING POCKETS TIMBER FRAME PREVENTING RAISING THE SKIP. THE SKIP HAD TO BE MANUALLY EMPTIED TO FREE THE GATE. NO INJURIES OR DAMAGE RESULTED FROM THE INCIDENT. MSHA WAS NOTIFIED IMMEDIATELY OF THE SITUATION.