Abstract
At Eagle Lake in western Ontario are early pre-Cambrian metamorphic rocks intruded by two different granites. The earlier, a gray granite, has dikes of light-colored pegmatite, which in one locality take the form of a tinstone-bearing pegmatitic greisen. A tinstone-bearing greisen has also been reported from eastern Manitoba, and a reddish pegmatite at Shatford Lake in eastern Manitoba also carries tinstone. The several occurrences indicate a tin-bearing area of about 150 miles in length.
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