212 Mr, Schooléraft on the 
this point, they teach,—that large veins of native copper 
are seldom found, but that it is frequently disseminated in 
scattered masses upon the surface, is rather to be consider- 
Jand, “ is found chiefly in primitive rocks, through which it 
is sometimes disseminated, or more frequently it enters into 
the composition of metallic veins, which traverse these rocks. 
It is thus connected with granite, gneiss, micaceous and ar- 
gillaceous slates, granular limestone, chlorite, serpentine, 
It also occurs in transition and secon- 
ocks. it accompanies other ores of copper, as the 
ed oxyde, the carbonate and sulphuret of copper, pyritous 
nd grey copper, also the red and brown oxides of iron, 
oxide of tin, &c. Its usual gangues are quartz, the fluate 
and carbonate of lime, and sulphate of barytes. At Ober- 
stein it occurs in prehnite; and in the Faroe islands, it ac- 
companies zeolite. 
- Native copper is not rare, nor is it found in sufficient 
quantity to be explored by itself. It sometimes occurs in 
ose, insolated masses of considerable size.” (1 
From all the facts which I have been able to collect on 
lake Superior, and after a deliberation upon them since my 
return, I have drawn the following conclusions :-— 
Ist. That the alluvial soil along the banks of the Onton- 
agon river, extending to its source, and embracing the con- 
iciently extensive to be- 
ing operations, is to be 
$ conclusion is. support- 
