Depart from the Pla de la Lau car park.
(S/E) Head south and take a wide, flat forest track. After a large open space, the path narrows under the light forest canopy. Follow the signs for the Estagnous refuge and Mont Valier. Stay on the left bank of the stream.
(1) At a fork, turn left towards the Refuge des Estagnous and Mont Valier (ignore the path that goes straight up to Barlonguère). Cross the Riberot via two successive footbridges. The trail then climbs up the right bank of the stream and crosses a few clearings alternating with wooded areas.
(2) At the intersection after Tute de l'Ours, take the path on the right and cross the Riberot stream via a footbridge. Now climb up the left bank of the stream to the Nerech waterfall.
(3) Cross the stream again via a footbridge. The slope becomes steeper at first: climb up a few switchbacks. The slope then levels out somewhat. This brings you to the Cabane de Caussis.
(4) Just after the hut, continue left uphill towards the Estagnous refuge (ignore the path on the right towards Étang Rond). The path climbs steadily east-southeast to reach the Estagnous refuge.
(5) The path continues eastwards, initially climbing gently. The gradient then becomes steeper and handrails secure the most difficult sections. You will reach the Col de Faustin.
(6) Then head north-east to climb relatively easy slopes. This will take you to the summit.
(7) Mont Valier. Return via the same route to the car park (S/E).

. The descent was a bit long in these conditions (4h15 from the refuge, including a 20-minute break).