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The Røros copper-mines used to produce from 600 to 700 tons
of copper, and about 20,000 tons of pyrites for export, but with
the new works, the production will be considerably increased.
From 1646 to 1897 the Røros copper-mines have produced
73,000 tons of copper, and from 1880 to 1897 about 260,000
tons of pyrites for export, the aggregate value being 133 million
kroner, of which the pyrites exported represents 4 ½ million. The
net yield may be estimated at 36,000,000 kroner for all these years
taken together. The mines are owned by a Norwegian joint-stock
company.
The Sulitjelma copper-mines, in Salten in Nordland, are worked
for the same ores as the Røros mines. They produce partly copper
and partly pyrites for export. They were not opened for
exploitation until 1887, yet in 1897 they employed from 600 to 700
men, and the annual output is about 30,000 tons of pyrites for
export, while the smelting ore yields about 350 tons of copper.
At the mines, which are worked by a Swedish joint-stock
company, there are several considerable lodes of cupriferous iron pyrites,
and the output will probably be considerably increased.
The Aamdal copper-mines in Telemarken produce copper pyrites,
which is dressed and exported. The mines are old, and have been
worked partly by Norwegians and partly by Englishmen.
During the years 1876 to 1897, the output of copper-ore has
yielded a total of 5,700 tons of copper.
Besides the copper-mines here mentioned, there have been
a considerable number of old mines that are now closed, such as
Meraker or Selbu copper-mines in Meraker, Løkken copper-mines
in Orkedalen, Dragset in Meldalen, Bøilestad mines in Froland.
Some mines have been worked partly for cupriferous iron
pyrites and partly for pyrites for export.
The most important of these were the Vigsnes mines, which
were worked by a Belgian-French company from 1865 to 1894,
with a total output of about 900,000 tons. The works were
closed in 1894, when the mines had reached a depth of
2410 feet.
Other important, partly cupriferous, pyrites mines have been
worked at the Ytterø works on the Trondhjem Fjord, and Valahei
mines on the Hardanger Fjord.
Important ores of pyrites occur at the Foldal mines in
Foldalen, and in the Undal mines, but it has hitherto been impossible
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