THE IRON ORE SUPPLY OF THE SCANDINAVIAN PENINSULA. 307 
Tn the year 1905, in connection with a motion made in the Swedish 
Parliament for laying an export duty on iron ore, the question of ore 
supplies was again discussed. A. E. Térnebohm, at this time Director 
of the Geological Survey of Sweden, made an official statement, in which 
he expressed very optimistic views. In respect to Central Sweden he 
came to about the same figures as those already mentioned above, viz., 
105 M.T. ; but in the estimation of the ore quantities of Norrbotten he 
made the arbitrary assumption that the ore bodies should reach to depths 
of 300 metres, or even of 500 metres, with the same area as at the surface. 
In this way he came to a figure for Kiirunnavaara and Luossavaara of 
793 M.T., Gellivara 128°5 M.T., and for the other mines in Norrbotten 
to 175 M.T. ; total for Norrbotten 1096°5 M.T. 
Criticising this estimation I pointed out that no results of experience 
at all were accessible concerning the depth of the ore deposits of 
Norrbotten, that their geological conditions and mode of formation were 
unknown, and that the experience from other districts in Sweden showed 
that the ore area of each single ore body tends to decrease with the 
depth. ; 
For this reason I believed that the statement could not be verified 
with such uncertain depths. Accepting the calculation of Mr. Lundbohm 
from the year 1898 of 205 M.T. above the level of Luossajirvi, I added 
100 M.T. as ‘ore expectant’ below this level. For Gellivara, together 
with other mining-fields of Norrbotten, I came to the result of 200 M.T., 
to a total for Norrbotten of 500 M.T., and for the whole country 
600 M.T., instead of Térnebohm’s 1200 M.T, 
In this year (1907) Professor W. Petersson has made an official 
statement of the ore quantities of some of the largest ore deposits of 
Norrbotten, founded chiefly on the records collected by the mining 
companies. 
I shall have an opportunity later to refer to the statement of 
Professor Petersson, which on the whole was executed on a sound and 
conservative basis. 
As to the Norwegian mining-fields, the records are very scanty. 
Professor Vogt has given a few figures about some of the ore deposits of 
the Norwegian south coast and of the ore province of Northern Norway. 
Furthermore, some figures given in commercial papers are obtainable 
but these must be used with very great caution. 
After this general review I shall consider each ore province separately. 
1. Ore Province of Central Sweden. 
In this ore province we have one large ore deposit, Grangesberg, con- 
taining more than half of the obtainable ore and a number of smaller 
deposits. For Griingesberg we have two recent calculations of the ore 
quantity. The first, which was made by the mining engineer, Mr. 
Brunnberg, and published by Térnebohm in the year 1905, resulted in 
a figure of 60 M.T., reckoned to a depth of 300 metres. Later Mr. 
Hedberg published a new calculation. This resulted in a figure of 
64 M.T. for the ore quantity between the surface and a depth of 
350 m.: of this already about 12} M.T. are consumed, so that above the 
said level of 350 metres at least 51 M.T. will remain. 
In the other mining-fields and the countless smaller mines scattered 
over this ore province, chiefly carrying ore low in phosphorus, from 
1907. Z 
