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.
Henrich Krummedige
Krummedige understood the value of maximizing the profit from his produce by selling it for the best price and participated actively in commercial trade – owning houses and commercial facilities in Bergen, Oslo, and Tønsberg in Norway as well as Roskilde, the Gothenburg area (Nya Lödöse), Halmstad, Malmø, and Copenhagen in Denmark. He also participated in foreign trade with his own vessels. 
His interests were not limited to agriculture and commerce. He may have run the earliest known copper mining venture in Norway, which was located at "Sandsvær". The mine is mentioned in a 1490 letter from King Hans to Henrik Krummedike, and is the first written source that directly deals with a copper mine in Norway, mentioning "our copper plant in Sandsvær." (Benedictow 1991:9). Although Krummedike and Pålsson were granted the mining rights, there are no sources confirming the mine was cost effective. He was among the first who used water-driven saws for the production of large quantities of lumber in Norway and may have introduced them. He also constructed a large brick kiln capable of producing over 18,000 bricks at a firing on his estate in Månstorp