 Even as far back as the 19th century, the mine directories kept by the Kingdom of Bavaria, to which Oberweiler belonged after the Congress of Vienna, listed three limestone galleries within Oberweiler's limits.The mill in its heyday had an overshot waterwheel and one run, for gristmilling, and this could then only be used when the mills farther upstream, at Eßweiler, saw fit to release enough water.Today, farming is still an important part of the economy, but most villagers in the workforce must seek work elsewhere, commuting to jobs outside the village.