I3i 



while a series of narrow quartz veins, 6 to 18 inches wide on 

 the Lindburg claim, have a dip at the surface of only 20°. 

 The prevailing dip of the schist in the Porcupine area is to 

 the north at a high angle, and frequently the veins dip dis- 

 tinctly to the south across the cleavage of the schist. While 

 it is apparent that most of the deformation of the country 

 antedates the vein formation, nevertheless there is a decided 

 tendency in many cases for the Assuring to be influenced 

 by the direction of schistosity, which is also a direction of 



Photograph of quartz from the Swastika mine. The quartz shows dark 

 streaks in crushed areas. Iron pyrites is abundant along the dark 

 lines, together with visible gold. Length of sample, 3% inches. 



weakness; hence we find veins having a more or less 

 lenticular structure, the strike of which closely corresponds 

 to that of the country rock. 



Lenticular veins occur chiefly where the country rocks 

 have been intensely sheared or rendered schistose, as around 

 Pearl lake. Usually when there has been less disturbance, 

 the veins are more likely to have a marked difference in 

 strike from the enclosing rock — as around Three Nations 

 lake and the porphyry area south of Simpson lake. It may 



