AFHDML 201 



exceeding 2^ inches ; it is sufficiently compact and hart! to reo i\e 

 a firm polish, but it is rather disposed to break iflSS small irn Hi- 

 lar n eeimen furnished, upon analysis, 47.5 per cent. 

 of pure eoppt r. 



On the western side of Keweena Point, the same ore appears 

 under different circumstances, being (lis;- emulated through the 

 body of the trap-rock, m grains varying m size from a pin's head to 

 a pea. Although many of these grains are wholly copper black, 

 they are occasionally only depositions of the mineral upon 

 specks of cornelian, chalcedony, or agate, or are more frequently 

 composed, in part, of what is apparently an imperfect steatite. 

 The ore is so connected with, and so much resembles in colour the 

 rock, of which it may be said to be a constituent part, that the- 

 might easily, during a hasty examination, be confounded. A 

 random specimen of the rock furnished, upon analysis, 3.2 per 

 cent, of pure copper. The rock continues combined with that 

 mineral for nearly the space of three miles. Extremely thin veins 

 of copper black were observed to traverse this same rock ; and 

 in enlargements of these were discovered several masses of amor- 

 phous native copper. The latter mineral appeared in two forms 

 — the one consisting of compact and malleable masses, carrying 

 from 4 to 10 eunces each ; and the other, of specks and fasciculi 

 of pure copper, binding together confused masses of copper green, 

 and partially disintegrated trap-rock : the latter was of several 

 pounds' weight. Each variety was closely embraced by the rock, 

 although the action of the water upon the rock had occasionally 

 exposed to view points of the metal. In addition to the accom- 

 panying copper green, which was in a disintegrated state, small 

 specks of the oxyd of copper were associated in most of the native 

 specimens. 



Circumstances would not permit an examination of any portion 

 of the trap formation, except that bordering directly upon the lake. 

 Hut facts would lead us to infer that that formation extends from 

 one side of Keweena Point to the other, and that a range of thickly 

 wooded hills, which traverses the point, is based upon, if not 

 formed of, that rock. An Indian information which, particularly 

 upon such a subject, must be adopted with caution, would sanction 





