The Carbonífera del Ebro and the lignite mines Historical milestone · Mequinenza, Bajo Cinca, Zaragoza The lignite basin of Mequinenza was worked intensively from the end of the nineteenth century. La Carbonífera del Ebro, founded in 1880, attracted miners from all over Spain: the population went from some 2,400 inhabitants in 1900 to more than 4,200 in 1920. 1880-1970 Photo: Mequinensa (Public domain) What to see and do in Mequinenza