1 66 



The rocks in the siliceous zone vary in the amount of 

 silicification undergone. In most places they are nearly 

 pure quartz schists, but occasionally the zone consists of 

 alternating dark and white bands. The width of the zone 

 ranges from 30 to 60 feet (9 to 18 m.) or more. The dip, 

 where it skirts the smaller arm and crosses the deposit, is 

 to the northwest, but after bending to the northwest the 

 dip, as shown by the bore-holes, changes to the northeast. 

 It thus forms the hanging wall of both arms. The metallic 

 minerals present consist mainly of iron pyrite, some of it 

 cupriferous, pyrrhotite, and subordinate quantities of 

 chalcopyrite. A little bornite, evidently secondary, was 

 found at one point. The principal non-metallic constitu- 

 ents are quartz, some calcite, a greenish micaceous schist, 

 probably largely chloritic, some brownish micaceous schists, 

 and occasionally some hornblende. 



Pyrite is the most abundant metallic mineral present. 

 It usually occurs in a granular condition, and in places 

 near the surface breaks down into an iron sand. It is 

 always associated with more or less quartz and large areas 

 consist of pyrite grains separated by a thin siliceous 

 matrix. It also occurs in grains and small bunches dis- 

 tributed through the secondary schists. Its distribution 

 through the mineralized area is irregular, some portions 

 containing only a small percentage, while others consist 

 almost entirely of sulphides and quartz. The main tunnel, 

 started some distance down the slope from the mineralized 

 area to gain depth, passes through 380 feet (116 m.) of 

 argillites, all somewhat altered and containing occasional 

 grains and small bunches of pyrite, then through a pyritic 

 zone 200 feet (61 m.) wide, becoming very siliceous to- 

 wards the northwest border, then through a greenish 

 schistose zone with some quartz and pyrite 240 feet (73 m.) 

 wide, beyond which is a second pyritic area which con- 

 tinues to the end of the tunnel 120 feet (36 m). A drift 

 to the left from a point near the end of the tunnel running 

 about north for 300 feet (91 m) shows the continuation of 

 the pyritic area for that distance, the breast being in 

 granular sulphides, mostly pyrite, embedded in a siliceous 

 matrix. A drift to the left passes through sulphides and 

 quartz for 100 feet (30 m.) then through greenish chloritic 

 schists, only slightly mineralized, for 120 feet (36 m.) 



The comparatively barren interval separating the two 

 pyritic areas in the tunnel is not apparent on the surface, 



