In the surroundings of the Bridge, in the same shore as the Priory, there is an archaeological site with a fountain and various laundry sinks that must have been used, according to an archaeological study, for wool treatment. The wool trade was very common in this area from the Middle Ages and, without a doubt, was part of the works of the Monastery of San Millán. The archaeological site is dated, probably in the 17th century, although ceramic remains of Roman origin have also been found.

​ The income of the Monastery of San Millán mainly came from the territorial domain due to its extensive number of hectares. The municipalities that had the largest amount of land were San Millán Valley, Badarán and Cihuri. Agriculture and sheep farming were the main resources. Normally the treatment, cleaning and purification of the wool were carried out near the shearing areas, especially in summer.

In addition to the stone extraction area, you can see a fountain with two concatenated prehistoric basins at different heights, carved for textile washing and cold rinsing. Both basins also served as small troughs for the traditional fountain.

​ In the complex, there is an area with two angled rectangular rooms, whose function was the cleaning and rinsing of the hot wool after shearing. You can see the stone carvings of the gutters for the drainage. In addition, some stairs carved into the rock allowed access to the upper area where the hot water boilers were placed, to be able to turn it through the drain that fell into the depths. It is possible to see an external channel on the eastern side with a greater width and rock pouring depth, focused on favouring maintenance work, and capturing surface water resources by infiltration.

​ Although the activity as a warehouse for wool in the Cihuri Priory is documented, at least since the end of the 16th century, the Madoz Dictionary (1850) also describes the Priory building and its uses, including working with the wool:

​ “The Priorato house, located half a quarter of a league from the village and next to the previously mentioned stone bridge over the Tirón river, consists of a solid and spacious building of medium size, with all the desirable comforts. There are also all the necessary tools and space to collect more than a thousand fanegas (1.58 bushels) of grain, a place to store wool and good wine pressing houses to keep five to six thousand tanks of very good quality wine that has been harvested from more than five hundred obradas (4,000 m2) of vineyards and white soil. All these lands and buildings are owned by a private individual who has bought them from the state for a million and a half reals”.