The Santa María pit and the beginning of mining Historical milestone · Ariño, Andorra-Sierra de Arcos, Teruel Image of Ariño, not of the place itself. The opening of the Santa María pit in 1914 transformed the municipality's economy. From 1940 the Sociedad Anónima Minera Catalano-Aragonesa built housing, schools and facilities, and the population reached its peak in the fifties. 1914 Photo: B25es (CC BY-SA 4.0) What to see and do in Ariño