The opening of the potash mines Historical milestone · Súria, Bages, Barcelona Image of Súria, not of the place itself. The working of the potassium salts began in Súria around 1918 and later extended to Sallent and to Cardona. Mining transformed the landscape with spoil heaps and headframes and sustained a good part of the comarca's economy during the twentieth century. 1918 Photo: E.R.R from Súria (CC BY-SA 2.0) What to see and do in Súria