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.
Kongsberg School of Mines
At the 1769 Census, Kongsberg was the second largest city in Norway (after Bergen), with more than 8,000 inhabitants, and the number of employees at the Kongsberg Silver Mines exceeded 4,000.