134 



Microscopical and other Characteristics. 



Under the microscope the gold is generally found in 

 areas which have been greatly crushed or in the quartz or 

 schist bordering on these areas. 



The prominent minerals which occur in the crushed 

 areas are pyrite, calcite, dolomite, sericite, chlorite, tourma- 

 line and quartz. It is thought that most of the gold has 



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Streaked ore from the Jupiter mine. Porcupine. The dark lines are 

 tourmaline; the quartz is much crushed and contains visible gold. 



been deposited along with pyrite from the solutions which 

 circulated in the minute fissures and crushed areas of the 

 primary quartz of the veins. The quartz of No. I vein of 

 the Hollinger mine shows numerous dark streaks in parts 

 of it and often across the width of the vein. These are 

 generally short and irregular in distribution. Iron pyrites 

 and often galena occur with the gold. Examined micro- 

 scopically, the quartz is seen to occur in fairlv large grains, 



