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.
Spitsbergen
Since the resettlement of Spitsbergen in the early 20th century, coal mining has been the dominant commercial activity. Store Norske Spitsbergen Kulkompani, a subsidiary of the Norwegian Ministry of Trade and Industry, operates Svea Nord in Sveagruva and Mine 7 in Longyearbyen. The former produced 3.4 million tonnes in 2008, while the latter sends 35% of its output to Longyearbyen Power Station. Since 2007, there has not been any significant mining by the Russian state-owned Arktikugol in Barentsburg. There has previously been some test drilling for petroleum on land, but this did not give results good enough to justify permanent operation. The Norwegian authorities do not allow offshore petroleum drilling activities for environmental reasons, and the land formerly test-drilled on has been protected as nature reserves or national parks.