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.
Kevitsa mine
The Kevitsa mine is a large mine in the north of Finland in Lapland. Kevitsa represents one of the largest nickel reserve in Finland having estimated reserves of 237.4 million tonnes of ore grading 0.3% nickel. The 237.4 million tonnes of ore contains 710,000 tonnes of nickel metal.