Mina de los Alemanes

Tungsten, highly valued for the manufacture of weapons, was mined in Valborraz in the Casaio mines in three phases.Phase of the Belgians: 1913 to 1928, Belgian company Valborraz wolfram mines. Some mines were on land belonging to the Count of Peña Ramiro, who had chartered them to the residents of Casaio, who sublet them to the engineer D. Edgar D'Hoore in 1914.

Phase of the Germans: 1937 to 1945, with an appendix of reactivation until 1954 (Korean War). In this phase, the mining area also served as a concentration camp, where republican militants on probation redeemed their sentences through work.

Third Phase: 1954 to 1963, date on which the extraction of tungsten stopped. Exploited by several entrepreneurs, including Leoncio Fernández Real, a native of Riodolas, who founded the CUPIRE-PADESA slate company in 1961.

The barracks and the laundry, dating from 1957, have been preserved.