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.
Nordic Mining
Originally an integrated part of Norwegian petroleum company Rocksource ASA, today's Nordic Mining ASA was de-merged and established as an independent public limited company on 23 February 2006, and received Rocksource ASA's assets and liabilities related to metals and minerals. In September 2006, Nordic Mining ASA also acquired claims to the Engebøfjell rutile deposit from ConocoPhillips Investments Norge AS.