134 Canadian Record of Science. 
All the Scandinavian Nickel Deposits—perhaps 50 to 80 
have been worked to a greater or less extent—are intimate- 
ly related to masses of gabbro, a rock composed of plagio- 
clase feldspar and augite, or of norite, a closely allied rock 
composed of plagioclase feldspar and hypersthene. The 
ore is Magnetic Pyrites, containing 3 to5 per cent. of nickel 
and cobalt, which ore is a constituent of the gabbro but is 
principally concentrated along the contact of the gabbro with 
the surrounding gneissic rocks. The accompanying cuts 
illustrate the mode of its occurrence in three localities. 
The scale is in meters. 
Fig. 1.—Tar Nysten AnD Bamue MINEs. 
a.—Red Gneiss. 
b6.—Black Gneiss and Mica Schist. 
c.—Gabbro. 
The black portions are openings on pyrrhotite holding 4 p. c. of Nickel. 
Associated with the Magnetic Pyrites (Fe, S,) are 
ordinary Iron Pyrite (Fe S,) Copper Pyrite (Cu Fe 3) 
and in some places Titanic Iron Ore. . 
The Magnetic Pyrites when pure usually contains as be- 
fore mentioned 3 to 5 per cent. of nickel and cobalt, but as 
much as 7 per cent. is sometimes present. These metals are 
usually present in the proportion of one part of cobalt to 
from seven to twelve parts of nickel. The [ron Pyrites 
on the other hand usually contains more cobalt than nickel. 
Copper Pyrite is never present in large amount. 
rai 
