Minería de la sierra de Posadas y Alfred Brandt Historical milestone · Posadas, Valle Medio del Guadalquivir, Córdoba Image of Posadas, not of the place itself. The Sierra de Posadas has since ancient times been an area producing silver, lead and zinc; most of its mining buildings and facilities were built in the late 19th century under the direction of the German engineer Alfred Brandt. The arrival of the railway in 1859 boosted the local industry. finales del siglo XIX Photo: Turismo Posadas (CC BY-SA 4.0) What to see and do in Posadas