The local mountain Gonzen towers up imposingly over the small town of Sargans. The iron-bearing rock was discovered and mined in the mountain around 2000 years ago. A labyrinth of uncountable galleries with a total length of almost 90 kilometres was created.
Since 1983 a small part of the mine has been open to the public. At the entrance to the mine there is a restaurant and a museum. The museum is located at the back of the restaurant and can be visited independently of a guided tour during the restaurant's opening hours.
Various guided tours are available, advance reservation is required.