132 R. BELL — NICKEL AND COPPER DEPOSITS OF SUDBURY. 



lower portion of the mass ; or if it were injected between the preexisting 

 rocks, these materials may have been impelled to the sides. 



In some cases the belts of diorite are much broken up and disturbed longi- 

 tudinally, and along these horizons they are mixed with large and small 

 fragments of other rocks showing lines of volcanic movement during their 

 formation. Examples of coarsely brecciated diorite of this kind may be 

 seen near the Dominion mine, the Stobie mine, and thence southwestward to 

 beyond the Canadian Pacific railway, at the Copper Cliff, the Crean or Mc- 

 Connell and the Vermilion mines, in Denison, at Ross' location north of 

 Morgan township, in the northeastern part of Levack and near the western 

 end of Bannerman lake. This condition of the diorite seems favorable for the 

 production of the ore, probably on account of the physical disturbance which 

 it indicates. The lines of northeast and southwest disturbance, along which 

 successive occurrences of the ore are found, cannot always be traced con- 

 tinuously on the ground, but as the evidences of such disturbances make 

 their appearance from place to place upon these lines, and as geological 

 breaks are apt to be very persistent, we may infer that they are continuous. 



The first of the two long, narrow intrusions of gray crystalline diorite 

 which have been referred to, in its course from Whitson lake to the township 

 of Denison, cuts off a narrow slice all along the southeastern border of the 

 tongue of gneiss and quartz-syenite which lies in the middle of that part of 

 the Huronian belt. The ore deposits of the Waddell, Dominion, Russell, 

 Little Stobie, Murray, McConnell (in Snider), Lockerby and Mclntyre 

 properties, of lot 10, range I, of Snider, of tlie Crean or McConnell mine, and 

 of the "mineral range" of Denison appear to be all situated along the south- 

 eastern side of this diorite intrusion, or in its course, when it becomes narrow ; 

 while those of the Stobie and Frood mines and the other occurrences for two 

 miles southwest of the former, of the Copper Cliff and others in the vicinity, 

 of the Evans, of lot 12, range III, of Graham, and of the Vermilion mine 

 lie along the southeastern side of the separated slice of the gneiss and 

 quartz-syenite range just referred to, and mostly within the diorite belt 

 which skirts it on that side. 



The north wall of the Copper CliflTmine is formed of felsite, quartzite, and 

 a coarse red mixture of feldspar and quartz, besides diorite like that of the 

 south wall ; but the ore itself is invariably associated, here as elsewhere, with 

 the diorite. The Evans mine is situated further from the contact of the 

 gneiss than any of the others. The top of the ridge on which it occurs con- 

 sists mostly of graywacke, but the ore is accompanied by diorite which in 

 parts passes into a kind of soapstone or serpentine. A break in the con- 

 tinuity of the gneiss and quartz-syenite ridge runs northwestward across it 

 from the Copper Cliff to the McConnell mine, and all along this break there 

 are evidences of the existence of the ore, accompanied by crystalline and 



