The mining-metallurgical centre of Cerro de los Almadenes is located southwest of the village of Otero de Herreros and since 2009 several members of the Spanish Society for the History of Archaeology (SEHA) have been excavating at this site.
The archaeological work has located copper mines and a battery of ore reduction furnaces of a type hitherto unknown on the peninsula. The excavations have documented structures and materials dating mainly from the Late Republican, High-Imperial and Late Antique periods, although there are also remains from the 6th century BC. Monetary finds and the sculpture of a seated lady with her head removed also stand out.