Full resolution (JPEG) - On this page / på denna sida - VI. Mining and Metallurgical Industry. General Survey. By C. Sahlin - 1. Mining. By Valfrid Petersson
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vi. mining and metallurgical industry.
phorus-content rarely exceeding 0’03 %. As to the proportion of sulphur, 87"! %
of the prime ore produced in 1913 contained less than 0"05 % and only 3’i %
more than O’io %.
In 1913 were extracted altogether 10 989 005 tons of ore and waste, out
of which were obtained 7 475 571 tons of picked ore and concentrate,
making on an average 68-0 % of the röck hoisted. The average quantity of iron
ore relatively the röck hoisted for the whole of Sweden during the last 20
years has fluctuated between 54-5 % in 1893 and 71-1 °/o in 1911, and since
1903 has exceeded 62 %. This may be to a great extent accounted for
by the big contribution to the output of iron ore made during these years
by the Norrbotten mines, in which the quantity of ore is for the most
part high. In the mines of Central Sweden the quantity of iron ore
fluctuates as a rule, between 50 and 60 % of the röck hoisted.
The concentration of iron ore was carried on in 1913 at 38
concentration works, in which out of 1 537 664 tons of ferriferous materials 381190
tons of concentrates were produced. The following table summaries will
serve to give some notion of the quality of the crude ore and of the
concentrate produced from it.
. T . . Crude Ore Concentrate
Average Iron-content tons t(ms
less than 30 percent........................220 691 —
from 30 to 40 percent......................911 545 —
. 40 • 50 • ......................386 569 —
* 50 > 60 . ......................18 859 2 711
» 60 » 70 > ......................— 609 482
70 percent and over........................— 45 783
Total 1 537 664 657 976
Average Phosphorus-content ^"tons™*6
less than O’oos percent................181141
from 0*oo5 to O’oio percent........................220 687
> O’oio > 0*o2o > ........................81575
0*o2o » Ooso » ......................4 807
» 0 o3o > 0*o5o > ............ 87 357
» 0*050 » O-ioo . ............ 18 371
0*ioo percent and over................ 64 038
Total 657 976
Average sulphur-content ^tons^^
less than 0*oo5 percent................ 30 109
from 0*oo5 to O’oio percent............ 67 457
> O’oio > 0’oao » ............ 68 561
Ooao » 0’oao » ............ 65 082
. 0-O3O t 0*050 > ........................8 080
0*050 » O-ioo > ........................139 844
O ioo percent and over................................238 765
Sulphur-content not given............................40 078
Total 657 976
The number of workmen employed in 1913 in Swedish iron mines and in
concentration and briquetting works for iron ore was 11 811, out of which
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