£90 APPENDIX. 



the points selected for that purpose ; and it is beyond a doubt 

 true, that the company did not receive the least inducement to 

 continue their labors. 



In addition to these masses of native copper, an ore of that 

 metal has long been known to the lake traders as the green rock, 

 in which the characteristic substances are the green and blue car- 

 bonate of copper, accompanied by copper black. It is situated 

 upon Kevveena Point, 280 miles above the falls of the Ste. Marie. 

 The ore is embraced by w r hat is apparently a recently formed 

 crag ; and although it is of a kind, and so situated as to make 

 an imposing appearance, there is little certainty of its existence 

 in large quantities in this formation. The ore forms a thin cov- 

 ering to the pebbles of which the body of the rock is composed, and 

 is rarely observed in masses separate from it. The crag is com- 

 posed of angular fragments of trap-rock ; and the formation is 

 occasionally traversed by broad and continuous belts of calc. spar, 

 here and there tinged with copper. Although the ore was not 

 observed in any considerable quantity, except at one point, it ap- 

 parently exists in minute specks through a greater part of the 

 crag formation, which extends several miles, forming the shore of 

 the lake. 



This examination of the crag threw new interest upon the trap 

 formation, which had been first observed to take the place of the 

 sandstone at the bottom of a deep bay, called Montreal Bay, on 

 the easterly side of Keweena Point. The trap-rock continues 

 for a few miles, when the crag before noticed appears to lie di- 

 rectly upon it, and to form the extremity of the point ; the crag, 

 in turn, disappears, and the trap-rock is continued for a distance 

 of six or eight miles upon the westerly side of the point, when 

 the sandstone again reappears. 



The trap-rock is of a compact granular texture, occasionally run- 

 ning into the amygdaloid and loadstone varieties, and is rich in im- 

 bedded minerals, such as amethystine quartz, smoky quartz, corne- 

 lian, chalcedony, agate, &c, together with several of the ores of 

 copper. Traces of copper ore in the trap-rock were first noticed on 

 the easterly side of Keweena Point, and near the commencement 

 of the trap formation. This ore, which is an impure copper black, 

 was observed in a vein of variable thickness, but not in any part 



