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.
Jøssingfjord
The Tellnes mine, one of Norway's largest titanium mines, is located in the mountains about northeast of the fjord. The mine is run by a company called "Titania", and the fjord is used as the shipping port for the company. The Nedre Helleren Power Plant is located at the head of the fjord. The electricity is generated by water from lakes located high in the mountains and the water is piped down to the sea level power plant the force of the falling water produces the electricity.