Minas de Arditurri Historical milestone · Oiartzun, Donostialdea, Gipuzkoa Mining site of Peñas de Aya, already exploited in Roman times and active until 1984, with continuous exploitation for around 2,500 years; silver, iron, lead, zinc, fluorite and blende (sphalerite) were extracted. Photo: Txo (CC BY-SA 4.0) What to see and do in Oiartzun