sentences:  In 1820, the first, and therefore oldest, mining tunnel was driven into the mountain above the road leading to Schmittweiler (nowadays a constituent community of Schönenberg-Kübelberg).Another was driven in the same place, and may have been worked even during the Franco-Prussian War (1870-1871).It was last brought into service after the First World War, but owing to stiff competition from mines in the Saarland, it was shut up for good in 1925.