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-250 vi. mining and metallurgical industry.
Iron Ore Exports of Siveden.
Swedish iron ore mines are, as a rule, not very deep, only 7 mines have
the mining operations carried down to a depth of 300 m and over, and
only in one of them to a depth of 500 m. In none of these places the ore
has been different in composition from that at higher levels, nor has as a
rule been found that the dimensions of the ore deposit have decreased in
the depth. On the other hand, a number of minor deposits have pinched
out at comparatively small depths.
In a number of deposits, particularly in Lappland, diamond drillholes
have been sunk in order to investigate the depth of the deposit. Thus at
Kirunavara ore of considerable thickness has been shown for instance at
a depth of 540 meters below the foot of the mountain or 300 meters below
the level of Lake Luossajärvi situated at the foot of the mountain, and
at Gällivare it has been ascertained, even by diamond boring, that both the
"Tingvallskulle" ore and the "Fredrika" ore have the same thickness at a
depth of 240 meters as in the outcrop.
A computation of the supplies of ore in Sweden was made, for the
account of the International Geological Congress at Stockholm in 1910 by
the Geological Survey of Sweden as regards Central Sweden, and by Hj.
Lundbohm and Walfr. Petersson as regards Lappland.
This investigation has yielded the results, given in Table 43.
Because the high percentage of iron in the Swedish ores alluded to
above, these supplies of ore have been estimated to correspond to 845
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