Cassini found ring arcs orbiting with 2 of Saturn's moons. Those moons are Anthe and Methone, two of the three moons that Cassini had found between Mimas and Enceladus. The third one is Pallene. The arcs are likely made of dust knocked off the moons by little meteors and kept in arcs by Mimas.
Cassini Images Ring Arcs Among Two of Saturn's Moons | Universe Today
Cassini Images Ring Arcs Among Two of Saturn's Moons | Universe Today