In the mid-19th century, the site was expanded with the addition of offices and workshops. It was here that the tools and machines used by the miners were manufactured or repaired.
The complex, the nerve center of the mine, continued to expand until the first half of the 20th century, as activities expanded. There are fitting shops, a forge, a foundry, a sawmill and a carpentry, a boiler works, a mill, a gasworks and gasometers, warehouses, stables and more. For a long time, access to this industrial district across the canal from the town center was reserved exclusively for miners and personnel.