Kongsberg Silver Mines
The silver mines of Kongsberg, in Buskerud county in Norway, constitute the largest mining field in Norway, with over 80 different mines. It was the largest pre-industrial working place in Norway, with over 4,000 workers at its peak in the 1770s and supplied over 10% of the gross national product of the Danish–Norwegian union during its 335-year-long history: over 450,000 man-years were expended in the production.
Visnes, Rogaland
Visnes has a local copper mine that provided material for the Statue of Liberty in New York City. The copper at this site was first discovered in 1865. Visnes was the site of one of the most active of the Norwegian copper mines in history. During the 1870s, it was the largest copper mine in Norway. Up to 70% of Norway's copper export came from Visnes, which at that time was one of northern Europe's largest mines. This mine was in full operation throughout much of the latter half of the 19th century and was not fully closed until 1972. The copper mine has its own museum, Visnes Gruvemuseum.