THE IRON ORE SUPPLY OF THE SCANDINAVIAN PENINSULA. 399 
ore pro m® rock as more fair, I, with this reservation, accept the calcu- 
lation of Professor Petersson. 
About the ore quantities below the level of Lake Luossajirvi we 
know very little indeed. A few drillings have in some places proved 
the existence of ore at a depth of 200 m., but nothing is known about 
the length or width of the deposit on this level. Taking into considera- 
tion that in some places the hanging wall and the footwall seem to 
approach each other with increasing depth, it seems to me not allowable 
to add as ‘ ore expectant’ more than half the amount of the ore above 
the level of the lake, z.e., 100 M.T. 
Gellware is, in respect to magnitude, the second of the great iron 
deposits of Norrbotten. It gives an illustrative example of the way in 
which certain ore deposits have at first been over-estimated, and then, in 
consequence of more minute survey, have had their size reduced. As to 
the ore area, we have the following statements about Gellivare :— 
Hectares. 
In 1876 by the Geological Survey of Sweden 65 
In 1890 by the Royal Commission for investigating the apatite 
deposits : : ; ; 44 
In 1897 by Professor G. Nordenstrém : 3 : . c pe 7A8) 
In 1907 by Professor W. Petersson . ; ; ; : : . 185 
Thus during a period of thirty years the first estimate of the ore area 
has been reduced to less than a third. Experience proves that in Gelli- 
vare one may reckon on 2°9 tons of ore for every square metre of ore area 
sunk one metre, and from this it may be calculated that by an average 
sinking of the ore level to a depth of 150 m., about 80 M.T. should be 
obtained. Of this already about 13 M.T. have been mined, and the 
remaining 67 M.T. are then to Fe taken into account as ‘ore expectant.’ 
It may be that some of the deposits in Gellivare do not reach a depth of 
150 m., but others among the numerous ore bodies will certainly be found 
to reach further down, thus averaging the differences. 
There are in Norrbotten three more ore-fields of the same order of 
magnitude : LHkstrémsberg, Svappavaara, and Levediniemi ; for each of 
these the ore area is stated to be about 50,000 m2, but the statement is 
very uncertain. These ore-fields are not yet worked, lying far away from 
railway communications, and the ore supply is only known through 
surface workings, drillings, and magnetic surveys. Owing to the greater 
percentage of ore obtained from the mined rock at Ekstromsberg, one 
may count four tons of ore from every square metre sunk, and 3:5 tons 
per square metre from Svappavaara and Levedniemi. This gives for a 
depth of 150 m. 30 M.T. for Ekstrémsberg, and about 55 M.T. for the 
two others. 
In the vicinity of Kiirunnavaara two smaller ore deposits occur, being 
of the same nature as this one. One is Luossavaara, the other Zuollu- 
vaara ; only the latter has, as yet, been worked. The ore area of 
Luossavaara is about 50,000 m?, that of Tuolluvaara much smaller, 
The ore quantity of Luossavaara was in 1897 estimated at 18 M.T., 
and by Professor Petersson, in 1907, at 22-5, both calculating only the 
ore above the level of Luossajirvi. I think it will be safe to reckon 
20 M.T. as an average between the two figures for Luossavaara and 
for Tuolluvaara, together with other small deposits near Kiiruna, 
perhaps 8 M.T. 
There are also several smaller deposits scattered over this ore provin 
Z2 
