It seems that there is a building here (seen on satellite views) which could be a cabin/wilderness hut. 
Maybe this is what is called Refuge de Port Perrier. 
At the moment, Refuge de Port Perrier is shown on the map on the western bank of Port Perrier, about 3 kms to the south-west, and much more when on foot!
Are there in fact two cabins in these surroundings, or is Refuge de Port Perrier misplaced on the map?
Good to check it, especially for safety reasons in this environment.