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RIDDARHYTTE AKTIEBOLAG
71
Concentration Works, picking shed and screening device at Bäckegruva.
These tables show that there has been a decrease in the output since the
termination of the war. This year, however, there will be a considerable increase, so
that the total production will probably reach 200,000 tons. And it will not stop at
this figure.
Copper and iron pyrites and cerite ore, used in the manufacture of pyrophorous
alloys and other cerite compounds, are obtained as by-products.
The quality of the iron ores intended for sale is shown by the following table:
Källfallet Backe Källfallet östergruvan
i Lump Ore Lump Ore Concentrate Concentrate
,ta.
Fe2O3 57’79 - 60’20 65’57
Fe O 27-31 - 28’12 29’29
SiO2 7-89 14-06 6’69 2’56
Mn 0-14 j 0’32 0’09 0’29
Ca O 0-88 2’93 l 0’59 0’82
Mg O | 3-92 1-80 l 2-71_________0’59
Fe j 60-62 56-58 62-65 65-68
P 0-005 0*005 0*002 0’002
S 0’06 0*09 0’06 0-76
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