Located on the torrent bed, it is a pond connected by a pipe to the mine, which is 50 meters away and is accessed through a door. At the bend of the Torre del Bisbe and the old convent of Santa Maria de Valdonzella we can see at 150 m the remains of the Fornot de les Torres, an old lime kiln from the 18th century.
Artisan lime kilns were built by digging a hole about 4 or 6 meters deep in the ground, in the shape of a pot or truncated cone. These kilns were opened along roadsides to facilitate access for carts carrying limestone, and once the kiln was finished, the lime was removed.
The time of year when they used to make lime was spring, between March and April, since in winter, as the land cannot be worked, they used to pluck the limestone and make firewood for it. a la cuita.
The kilns had two mouths: the upper, where they were loaded with stone, and the lower, where the fire was made and the lime was removed.
The master calcinaire knew that the stone was already cooked by observing the color of the smoke coming out of the kiln. At the beginning of the process the smoke was dark in color, while when the rock had already turned to lime, took on a light yellowish color or became colorless, this could last about twelve or fifteen days, then let the oven cool for a while. week to extract the baked stone.
The blocks of quicklime obtained were loaded into carts and moved to distribution tanks, where they were submerged in water to obtain slaked lime, which was the most common way lime was used in the construction industry.