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.
Evje og Hornnes
The Flåt nickel mine is situated a couple of hundreds of meters behind the Evje Mineralsti, and has been Europe's largest nickel mine. The mine was operated from 1844 initially as a copper mine, but from 1872 to 1946 as a nickel mine. The upper parts of the Flåt Nickel Mine is open to visitors and during the summer there are daily guided tours.