The Sao Domingos mine, the settlement, is a town generated out of nothing in 1854, the date on which the metallic poly-sulphuret deposit, which had already been exploited in Roman times, and throughout the 1st millennium CE, was rediscovered by an Italian from Piemonte called Nicolau Biava, an employee of the Alonso Mine (Huelva, Spain.) When the 19th century miners discovered the ancient remains (drains, wells and galleries, ruins of offices, objects of general use and mining equipment) the only signs of modern construction recorded were a chapel dedicated to Sao Domingos, built next to the iron deposit which crowned the pyritical deposit, and the Curral do Concelho, strategically placed near the Pego da Sarna, the point on the water line with same name where a sulphurous water spring arrived (stemming from the natural lixiviation of the minerals there), whose chemical properties made it good for resolving dermatological problems. The mining exploitation concession was granted by the Spanish company, held by French capital, La Sabina to the English company Mason & Barry, and marked the beginning of a great age in the Serra de Sao Domingos activity and the complete transformation of the landscape. In addition to the work to clear the Roman galleries and to open new wells and galleries, lodging was built to house the miners and their families, as well as a series of social buildings (hospital, theatre, pharmacy, recreational club, storage facilities, catholic church, Protestant cemetery for the British community, administration building) and industries: workshops, carpentry, laboratory, energy power plant, mine bottom-water extraction system, founding and sintering ovens, and absolutely decisive for the success of the venture, the railway tracks between the Sao Domingos Mine and Pomarao and the fluvial port installed there, on the banks of the Guadiana and Chança rivers. During the first years of exploration, Mason & Barry dedicated all of their efforts to the underground extraction, but around 1866, the drop in the value of copper obligated the administration to reconsider the implemented strategy and in the following year open pit mining was begun. As the open pit increased, almost all of the old village was destroyed and it was rebuilt in the location where it is found today. Over the years, new roads and social services were added to the urban zone, the most recent roads from the middle of the 19th century (Rua do Bispo and Ria de Dra. Violeta).