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From the Albert 1er hut: go up the true right bank of the Tour glacier, passing the Signal Reilly. Gain the Col du Tour and follow the NW ridge, crampons (+/- 40°). This leads to the summit of the Tête Blanche. Go down to the col Blanc then climb the W slope (30-35°, possible with skis). Leave the skis at a ski depot and reach the summit of the Petite Fourche by easy rocks.
The same route down to the Col Blanc then take the true left side of the Tour glacier to join the descent route from the Col du Passon which leads back to la Tour.