Systems of the Canada Geological Survey. 313 
F , there are 
me veins which carry considerable copper pyrites and which 
igon Bays. Considerable money has been expended in’ 
__ &xploring in this region, and in attempts at mining for copper. 
: Abundant as are the localities in this portion of the lake in which 
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this metal has been found, it may be doubted whether there ex- 
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operations have been commenced, show any very encouraging 
Indications. Valuable deposits may perhaps yet be discovered ; 
but ut mL that the thinness and irregularity of the igneous 
beds and the frequent changes of lithological character have pre- 
vented the metalliferous veins from assuming that development 
which they have in the cupriferous range of the south shore. 
_, The character of the metalliferous deposits which occur in the 
Azoic rocks still farther east than Lake Huron, is similar to that 
Which they present in the region of this lake and Lake Superior. 
The sulphurets of copper, lead and zine are the chief ores, and 
howhere do we find any veins resembling in character those of 
the native copper-bearing rocks of the bedded trap series, neither 
E Lak, succeed 
a € Superior in point of fact. | : 
From these considerations, it appears to us that the native 
Copper-bearing series of the north and south shores of Lake Su- 
_ Petor cannot be separated from the«Potsdam sandstone with 
- Which it is insorkies and neither is there any reason whatever 
ae pee it in the same line with the rocks of the north shore 
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