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.
Thamshavn Line
Mining at Løkken Verk had its roots back to 1633 when King Christian IV of Denmark–Norway had opened the mine. At this time all mining was a privilege of the king. Later, in the 1800s, the mine was privatised and owned by Løkken Kobber og Kisværks Interessentskab. In 1868 the local farmer and sawmill owner Wilhelm A. Thams and his accountant Christian Salvesen from Leith, Scotland founded the mining company Ørkedals Mining Company and bought a number of small mines around Løkken. In the early 1880s Wilhelm's grandson, Christian Thams returned from Switzerland and took over the running of the mining company. He realized that to make money from mining, he had to purchase the largest mine of the all, but didn't succeed until 1896 when it no longer was feasible to manually pump out the water, and bought Løkken Mine.