SERVICE HOIST MOTOR QUIT RUNNING AT 1:20PM & ELECTRICIANS WERE CALLED. THEY FOUND A CONTACTOR STUCK & HAD TO REPAIR IT. MSHA WAS CALLED & TOLD THE HOIST WAS DOWN AT 1:45PM & HOIST WENT BACK IN SERVICE AT 4:00PM. MSHA WAS CALLED AT 4:30PM & TOLD HOIST WAS BACK IN SERVICE.