Keep driving along this steep road for just over 10 kilometres until you reach a big white building on your left (Sidi Bougabrine).
When you reach the top (under 3 hours for a group of fit people), you will see that there are actually two peaks, the further one is barely higher than the first, but is the true summit.
Drop southwest off the summit, following a large gulley, but staying on the western shoulder.
This descent is particularly steep and frustrating, as the rocks are too large to scree glissade, while small enough to easily twist an ankle.
Follow this track heading north along the southern flank of the ridge you ascended for over ½ a kilometre.
Once there look northwest for another trail; follow it (passing some old mining buildings 500m from the pool: 36°21’30N; 10°06’04) until it starts running parallel to the road.