Zn-Pb-Fe stratiform deposit in Ordovician schists, slates, quartzites and limestones, slightly affected by Hercynian low grade regional metamorphism.
The deposit is known since 1717 and workings began around 1740. A French-Belgian mining company exploited the area until 1965. An aerial mining cable car built in 1912 was used for transporting the ore 1600 m down to Pontaut in the Garona River, 14 km to the west and only 2 km south of the French border. There it was shipped to France for processing.
Today, abandoned buildings, galleries, trenches and prospects are found spread across in Rasos de Liat, a grassy and rocky mountainous area at an altitude of 2300 m. A project by the Autonomous Government of the Aran Valley exists that pretends to rehabilitate the area for tourist visits.
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