Full resolution (JPEG) - On this page / på denna sida - Second part - IX. Mining Industry and Metal Production - 1. The Iron Mines (together with information regarding other mines). By the late Prof. O. G. Nordenström
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IX. MINING INDUSTRY AND METAL PRODUCTION OF SWEDEN.
lowing grouping of the iron ores of Sweden: a) iron ores principally accompanied
by qnartz and feldspar: ores belonging to this class are mostly hematites; b)
apati tiferous ores: sometimes magnetic ores and sometimes haematites; c)
pyroxeni-ferous, amphiboliferous, and garnetiferous ores: exclusively magnetite; d)
cilci-ferous and manganiferous ores: usually magnetite; e) titaniferous ores: exclusively
magnetite.
As a rule, especially the ores occurring in Central Sweden contain very little
phosphorus. Generally the percentage of phosphorus varies here between 0-oos %
and 0*o5 %. On the other hand, there are ores which contain from 0*i up to 1*5 %
of phosphorus, for instance some ores in Grängesberg, Gellivare, and Kiruna vara. In
the last two ore-fields, there are also ores which contain 1*5 to 3 % of phosphoros.
Gellivare. Transport of Ore.
Besides these kinds of iron ore, lake and bog ores are made use of in some
provinces, especially in Småland. The production of this kind of ores has,
however, always been insignificant in comparison with the production of mountain ores,
and during latter years it has decreased bo considerably that, in 1902, it only
amounted to 408 tons.
All the aforesaid ores, with the exception of the lake and bog ores, occur
in rocks belonging to the archæan series or azoic age (primitive röck), such as
gneiss, petrosilex-gneiss, petrosilex, especially the two latter.
All of these ore-deposits have, as a rule, the form of lenses, stocks, and kernels
(pockets). They are for the most part lenticular, and if so, have the same dip and
strike as the nearest countries. They are therefore considered as contemporaneous
in origin with these and have also in other respects a certain correspondence with
them, wherefore all these ores are considered to be stratifications.
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