On the Copper Range of Lake Superior. 



similar to the ( 



tares would be formed m exactly the same manner as those ex- 

 isting at this locality. In the process of elevation it would be 

 natural to suppose that the greatest amount of lateral motion 

 would take place along the surfaces of the sedimentary beds, for 

 the reason of their lesser adhesion, and besides that they present 

 a comparatively smooth surface, whereas the surfaces of the trap 

 ough and irregular as shown in the amygaloidul beds, 



■ other sedimentary 

 beds. 



The veins of the second and third class are mostly known in 

 the Portage Lake District. These may be due to a second ele- 

 vation of the mineral range, evidences of which, we see in the 

 |."Mtion of the terrraces on the shores of Portage Lake. These 

 ' north side of the lake are higher above the present sur- 

 tlie water than on the south side^ besides which, instead 

 a horizontal, present a very decided ascent towards the 

 Un the south shore this ascent is very perceptible and also 

 -Mange in grade, which takes place an the Sheldon location; 

 • t tiiut point it being steeper towards the east than the descent 

 ■^ ;>M-ds the west. 



_ The large veins of the tbird class, having a course of 60° to 



' ' E. of it— known m the mines as cross courses,— are mos6 



''"biibly the effects of the force causing the depression of the 



-''-c forming the deep gorge of Portage Lake. This view is 



'■.'1 supported by the results obtained in exploring at the Daco- 



'■vaiion on the south side of the Lake for the Pewabic lode, 



■ nings on which have been entirely confined to the north 



<)n runnino- its course and making calculations for the 



'•'■s in level,— on account of the dip of the lode^— bet'veen 



' chores the'lode was found to be at a point 1300 feet east 



'iitinuation of its direct course as pointed out by the sur- 



•^ho distance between the two points bemg about one half 



tHi nearly the whole being occupied by the gorge of Port- 



-"• ^"o prominent veins of this class have been found in 



^■^rlct, except on the hill sides bounding the Lake. Vein* 



-'^ ^ame class mav yet be discovered at a greater distance 



^'■"^:ii the lake altbou'^k not necessarily parallel wrth the ones 



^ow found. ° 



.^'jrejated Fe/ns.— The class of segregated veins has, within 

 '°e past live or six vears, attracted the most attention from the 

 ^'"i"g companies c>n account of the facilities they offer for eco- 

 "^"^'cal mining. They are as before stated simply beds of 

 ^^Priferous amygdaloid coincident in strike and dip with the 



