Rock salt of Cardona Food and drink · Cardona, Bages, Barcelona The salt diapir of Cardona was worked from Iberian and Roman times until the closure of the mines in 1990. From that deposit comes a very pure rock salt that for centuries preserved meats and fish and that today is packaged for the table. Photo: Etan J. Tal (CC BY-SA 3.0) What to see and do in Cardona