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(S) From Lac Blanc, take the path back down to the Refuge Jean Collet and head for the four-way junction.
(1) Turn right towards the Col de la Mine de Fer and head for the Habert de la Pierre. As its name suggests, this shelter is built against a huge rock.
(2) Walk along successive terraces between the rocks, which are home to marmots that are nevertheless very shy. The climb up to the Col de la Mine de Fer becomes very steep if you follow theGR®. It is better to take the path marked in yellow. Reach the pass.
(3) Return tothe GR®, and proceed with great caution across the snowfields and scree along a steeply sloping path that plunges down to Lac de Crop, an invitation to relax. In the background, you can see the Chartreuse, Bauges and Vercors mountain ranges! Walk along the eastern side of the lake and climb up the opposite side to rejoin the path towards the Pont de la Betta (01:30).
(4) Continue along theGR® which becomes more pleasant and shaded, pass through a metal gate, remembering to close it behind you, and you will soon come to a footbridge at Habert de Crop.
(5) Continue on to a track junction.
(6) Go straight on to reach the water intake and pumping station.
(7) Cross the ford and head down the wide track which takes us back to our starting point from the previous day (E).
Visorando Member
Very difficult 
Extremely difficult 
