lOO 



Origin — No definite law holds with regard to the order 

 of the formation of the several minerals. In 

 many instances however, siderite was formed first, fol- 

 lowed by zinc blende which replaced a portion of the 

 siderite. Galena succeeded the blende, and freibergite 

 followed, filling in fractures in the galena and to a certain 

 extent in the blende. 



The ore appears in great part to be primary and to have 

 been introduced by ascending solutions which deposited 

 their mineral content in the wider portions of the veins at 

 favourable horizons, where the action was aided by decrease 

 of pressure, lower temperature and by the reducing action 

 of the carbon in the crushed rock which forms an important 

 percentage of the vein filling. 



The ore was probably derived from some horizon of the 

 granitic rocks of the batholith which underlies the whole 

 area and is perhaps closely connected with the basic lampro- 

 phyric dykes. In several instances it was noted that 

 veins followed the same fissures as the dykes, in which 

 cases the ore lay on and along the dyke. 



Many of the ore shoots so far stoped have been com- 

 paratively shallow, but more recent development work 

 has shown ore at greater depths, in one case 1,270 feet 

 (387 m.) below the outcrop. The development of the last 

 two years has encouraged the belief that the ore shoots are 

 not merely surface deposits but that they will be found to 

 have a much greater vertical range than was formerly 

 believed. 



Miles and 

 Kilometres. 



Annotated Guide (Continued). 



69 m. Roseberry is situated on the delta of Wilson 



III km. creek at an elevation of 1,795 feet (547 m.) 

 above the sea. Just north of the station the 

 railway crosses an apophysis of the grano- 

 diorite intruded in the Slocan slates. Slocan 

 lake terminates north of Hills, but the valley 

 trench continues through to Nakusp, the railway 

 following closely the contact between the Slocan 

 series and the granodiorite. About a mile 

 (i-6 km.) north of Hills the abandoned valley 

 of the creek draining Summit lake is exposed, 

 the present creek flowing in a valley a little 

 further to the west. 



