126 



places has been sheared to a glistening or dull, sericite or 

 chlorite schist. 



The quartz porphyry varies in colour from very dark 

 grey to light greenish grey, the lighter colours being char- 

 acteristic of the more schistose varieties which grade into 

 sericite schists. The rock, where not too much sheared, is 

 crowded with crystal fragments of glassy quartz, white 

 orthoclase and acid plagioclase feldspar. 



The diabase is finely granular, in some cases nearly black 

 in colour; in others pale greenish and then has a pronounced 

 schistosity. 



The ore has generally a prominent slaty cleavage, is 

 fine grained, and is composed largely of finely granular 

 magnetite with a variable amount of hematite. Slight 

 variations in grain are visible along regularly alternating 

 bands. The banding varies in degree from microscopic 

 to very broadly developed, being indicated where coarse 

 by the occurrence of various impurities distributed along 

 bands. The ore has a general black colour, tinged greyish 

 from the presence of minute grains of quartz and feldspar 

 which in some bands are finely and uniformly disseminated, 

 while in other cases they occur in lines, narrow streaks 

 and lenticular areas. Considerable pyrite is present and 

 tends to occur in large and small, elongated, lenticular 

 aggregates. Quartz is relatively abundant occurring in 

 veins and stringers. A large number of analyses indicate 

 that the iron content of the ore ranges from 39-6 per cent 

 to 58-7 per cent; sulphur from 0-009 P er cent to 0-27 per 

 cent; and, phosphorus from 0-385 per cent to 1-222 per 

 cent. 



Examined in thin sections under the microscope, the 

 ore is seen to be composed of minute, rapidly alternating 

 bands of nearly pure iron ore, or of iron ore with consider- 

 able finely granular quartz and feldspar; and other bands 

 of nearly pure quartz, with varying proportions of feldspar, 

 iron ore, etc. 



In the case of No. 2 body, a portion of its southern end, 

 and of the east and west walls is visible. The greatest 

 width of the body where stripped, is a little over 40 feet 

 (12 m.). The containing walls are sharply defined, and 

 the body appears to dip to the west at angles varying be- 

 tween 6o° and 8o°. The ore is banded and some quartz is 

 present in comparatively large, irregular veins. Little 

 or no pyrite is to be seen except immediately along the 

 walls. 



