342 REPORTS ON THE STATE OF SCIENCE. 
Contents of the Ore expressed as Pig Iron. 
As already pointed out, the figures expressing the ore quantities of the 
different ore provinces are not directly comparable ; thus, for instance, 
the ores in the ore province of Norrbotten, z.¢., those of Kiirunnavaara, 
Gellivare, &c., generally contain about 65 per cent. of iron ; the ores from 
the ore province of Northern Norway in general hardly reach 40 per 
cent., of which only a part can be extracted. For the purpose of com- 
parison we may express the quantity of iron in the ore as pig iron. 
The majority of the iron mines of Central Sweden yield an ore giving 
about 50 per cent. pig iron ; only the greatest deposit, Grangesberg, 
produces a richer ore corresponding to 62 per cent. of pig iron, On the 
whole, for the ore province of Central Sweden we may calculate on 55 per 
cent. of pig iron from the ore. For the ore province of the south coast of 
Nroway the same figure as for the majority of mines in Central Sweden, 
i.e., 50 per cent., may be true. 
The ore province of Norrbotten produces ore still richer in iron. The 
greatest deposit, Kiirunnavaara, yields an ore giving on an average more 
than 65 per cent. of pig iron, and the same may be said about Luossa- 
vaara an! Gellivare. The ore from Svappavaara, Leveiniemi, and 
Ekstroémsberg is less rich, but on an average we may calculate on 65 per 
cent. pig iron from the ores of this ore province. 
The ores of the ore province of Northern Norway are all very lean 
ores. The experience in Dunderland is that it takes four tons of crude ore 
to produce one ton briquette, containing 65 per cent. to 68 per cent. Fe, 
which corresponds to about 16 per cent. pig iron from the crude ore. In 
Salangen and the other fields containing more magnetite the recovery 
will be better, and may be estimated at more than 25 per cent. pig iron 
from the ore. On an average, one may reckon on 25 per cent. pig iron 
from the mined ore in this province. 
The ores of the ore province of Syd-Varanger are magnetic, thus 
giving better results, and a percentage of 33 per cent. of pig iron from 
the ore may in this case be assumed. 
| | Percentage of | Ore Quantity | 
as Ore eee | pig iron from | expressed as | 
ae ela the ore pig iron 
| M.T, 
| Ore Province of Central Sweden . zh) 100 55 55 
| a »  Norbotten . yi ; 500 65 325 
» North Norway . . 450 25 112°5 
x s, South Coast of Norway | 10 50 5 
a »  Varanger . . Be 400 33 132 
Total 7 . i Bx 1460 — 629°5 
In the above calculation the small deposits in the ore province of 
Christiania are not taken into account, as they seem to be without any 
commercial importance and not one of them is now worked. For the 
same reason the Lake and Bog ores, scattered over most provinces, are 
not taken into consideration. Also the large supply of iron contained in 
the titaniferous iron ores is not taken into account, though some of these 
deposits, as Taberg and Routivara, in Sweden, and the titanic ores in the 
