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.
Norway
Norway contains significant mineral resources, and in 2013, its mineral production was valued at US$1.5 billion (Norwegian Geological Survey data). The most valuable minerals are calcium carbonate (limestone), building stone, nepheline syenite, olivine, iron, titanium, and nickel.