in the Sierra de Sis, not far from Santorens. You won't find it on many maps.
Driving southward from Pont de Suert
on the main road between
Vielha and Lleida (Lérida), try to find the turn to Santorens and Betesa.
It's about 10 km from Pont. Should you turn up
in Sopeira, that would mean that you have missed it. Once on the narrow road, look
for a branch to the left (straight-on would lead you into some hairpins to Santorens).
At the next option, choose right and continue until you'll find a ruin at the
left hand side of the road. Drop the car. You'll have to walk down into the valley
and try to spot what's left of the mill which is very ruinoso