78 



Diorites and Granites of Swift's Greek, 



d. Quartz diorite. 



Elizabeth Reef — This reef is situated on the steep hill 

 forming the south side of the valley of Swift's Creek, near 

 the Charlotte Spur, and is near the present line of contact. 

 It is in gneissic and granitic rocks, which, as I have pointed 

 out, form the margin of the intrusive mass in many places. 

 An examination of the neighbourhood showed me that 

 although the actual contact is in the stream bed, and at some 

 distance lower than and to the north of this mine, its plane 

 originally extended along the hillside to the summit of the 

 ridge, where traces of contact rock still exist as outliers, 

 forming isolated nobs in the granitic ridge. The line of 

 reef extending north and south from near the summit to the 

 stream indicates that it rills a fissure penetrating through 

 the contact rocks into the underlying intrusive masses. 



When I examined the reef it was being worked. I found 

 the shaft situated about 40 chains up the hillside from 

 Swift's Creek. The reef near the surface had an underlay 

 to south 85° west at 60°. It was 9 inches in width, with 

 granitic walls. On descending the shaft between SO and 40 

 feet, I found the appearances indicated in the subjoined 

 sketch. 





Diagram No. 6.— Sketch of the Quartz Vein at the Elizabeth 



Mine. 



a. Coarse gneissic quartz diorite, very much decomposed. 



b. Schistose hornfels. 



c. Auriferous quartz vein. 



The reef was here only 4 inches in width, and had a slight 

 underlay to the east. 



