Copper mines of Cerdido Curiosity · Cerdido, Ortegal, A Coruña Image of Cerdido, not of the place itself. In the abandoned galleries of these copper mines there formed, once extraction had ceased, speleothems of green, blue and yellow colours considered among the most spectacular in the north-west of the peninsula. Photo: Estevoaei (CC BY-SA 4.0) What to see and do in Cerdido