Turón coal mines Curiosity · Mieres, Caudal, Asturias Founded in 1890 with Basque capital to work the valley's coal, it came to have nine mines in 1926 and its production peak in 1958; Turón went from 2,000 residents to 20,000 before being absorbed into Hunosa in 1967. Photo: LBM1948 (CC BY-SA 4.0) What to see and do in Mieres