Silver mines of Calcena Historical milestone · Calcena, Aranda, Zaragoza Image of Calcena, not of the place itself. Calcena worked silver mines in the southern foothills of the Moncayo, with antecedents going back to Roman times. In the middle of the nineteenth century the activity sustained some eight hundred and sixty households, against the good fifty of today. siglo XIX Photo: Touriste (Public domain) What to see and do in Calcena