Under the shed that was rebuilt to protect the site from the weather, there were probably silos used to collect and classify the minerals extracted from the Saint-Jean and Balme mines, which arrived from the Frissonière descent gallery via a cable car. This foundry environment is described in 1909 as follows:
“The minerals, coming from the descent of Frissonia, arrive via the telefer to the upper level of a series of wooden silos that serve, in addition to the minerals themselves properly classified and sampled, also for coal, flux, and slags to be remelted.”
Extracted from the Mining Service Review in 1909, Publication of the Royal Corps of Mines, National Typography G. Bertero & C., Rome, 1910.
