AT ABOUT 8:00 AM, 2 GOLF CARTS WERE PUT ON CHARGE AT SHIFT CHANGE. AT ABOUT 9:55 AM, 2 MINERS SMELLED SMOKE ON TRAVEL WAY. THE MINE FOREMAN WAS NOTIFIED & TRAVELED TO SLOPE BOTTOM & FOUND 2 GOLF CARTS ON FIRE. THE FIRE WAS PUT OUT ABOUT 10:15 AM. CAUSE OF FIRE IS UNDETERMINED (INVESTIGATION ONGOING). ALL ELECTRICAL CIRCUITS SUPPLYING POWER TO GOLF CARTS FUNCTIONED OK.