THE IRON ORE SUPPLY OF THE SCANDINAVIAN PENINSULA. 341 
calculating 2-1 tons of crude ore in the cubic metre, we arrive at a figure 
of 315 M.T., or, in round numbers, 300 M.T. for a depth of 150 m., which 
depth, as an average, corresponds with the level of the Dunderland River. 
It is calculated that in the central part of the ore-field, where stoping 
is now going on, about 89 M.T. could be obtained by open pit workings 
on an area of 575,000 m. 
The amount of ore in Dunderland would thus be about as great as is 
Kiirunnavaara. But it must be remembered that the ores are of very 
different quality, the Kiirunnavaara ore averaging 65 per cent. iron, the 
Dunderland ore, on an average, not reaching 40 per cent, Fe, of which 
only a part can be extracted. 
Among the other numerous ore-fields of the same class, Sa/angen, 
Ofoten, and Rollé probably contain the largest ore quantities. These 
fields have not been sufficiently investigated to make an estimate of the 
ore quantities possible ; but the ore-bearing strata are very extensive, and 
may in each case be followed for kilometres in length. New ore deposits 
of this kind are found every year, and it seems certain that one may 
count on very great quantities. As a first approximation I venture to 
say that all these ore-fields together may contain at least half the amount 
of Dunderland, i.e., 150 M.T. in round numbers. 
For the ore province of Northern Norway we thus get :— 
M.T. 
Dunderland (to a Heath of 150m.) . ; : - . 300 
Other deposits . : ‘ : : Spi at; 
Total . . 450 
— 
4. Ore Province of the South Coast of Norway. 
This province contains a number of deposits, some of which were 
worked in very ancient times ; most of them are comparatively small. 
Vogt has given figures for the ore area of some of the districts, viz. :— 
M?. 
The Arendal district ‘ j : : F ‘ . 5000 
The Kragero . : 5 d 5 2 : - 2000-5000 
The Nissedal . : 4 : ; : : : . 1400 
The ore deposits are of the same nature as in Central Sweden ; many 
of the mines have already been abandoned at a comparatively small depth. 
If we put the ore quantity at 10 M.T., this figure is the highest one may 
venture for the whole province. 
5. Ore Province of Syd-Varanger. 
The deposits of this ore province were discovered only a few years ago, 
and only exploratory work has as yet been executed there. The deposits 
have a very great extension both in length and width. Mr. Nordensten 
recently estimated the ore area in this district at more than one million m?. 
Calculating 3°6 tons of ore for each cubic metre, he estimates the ore 
quantity in the Bjornvand field alone, the central part of the district, to 
be 112 M.T. above the level of the sea. In all one may count on 400 M.T. 
above the sea-level in this ore province. 
