Gondo Gold Mine
Switzerland
The Gondo Gold Mine was the largest gold mine in Switzerland. The mine is located in the south of the canton of Valais near the Italian border at over 1200 m above sea level. In its heyday up to 500 men worked here, while the municipality of Gondo itself had only 100 inhabitants.
Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).