Regarding the article “New type of gold in Canadian Shield” (T.N.M., March 6/95), I would like to draw your attention to the gold deposits within the Pontiac Supergroup at Malartic, Que., that were mined at the past-producing East Malartic mine.
They consist of stratabound zones in greywackes made up of pyrite-carbonate-chert of remarkable continuity and consistent grade (not always economic). Some would extend for more than 2 km on strike and at least 2 levels high (300 metres).
The mine geologists interpreted them as the source of some of the gold now found within the Cadillac Break, when such zones come close
to it.
I wonder if the above would be comparable to those at Saskatchewan’s La Ronge area, as mentioned in the article.
Michael Issigonis
Brandon, Man.
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