On the right of the boulder marked "C", in the Western part of the sector. Hanging start with the hands on the lowest stratum as for Bonne Mine, traverse to the right on the ledge as for Quelle Mine, downclimb to join the start of Meilleure Mine without using the pedestal, traverse to the left on horizontal ledges without using the pedestal and exit as for Bonne Mine.
NB: it's also possible to exit on the left in Mine Héros (same grade, first known ascent by Titouan Baudin).