Canadian half dollars and dollars 1937-1967 are 80% silver and 20% copper by weight.
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Canadian dollars, half dollars, quarters and dimes from 1920 - 1966 are all 80% silver by weight. The easy calculation to figure out the pure silver weight is by multiplying .6 oz per dollar of coinage. As an example, $10 of 1966 dimes would be .6 x 10 or 6 oz's of pure silver. Multiplying the total by today's price would give you "melt" value of the coins.
dollar 1935–1967 23.33 g 36.00 mm 80% silver, 20% copper half 1937–1967 11.66 g 29.72 mm 80% silver, 20% copper quarter 1953–1967 5.83 g 23.88 mm 80% silver, 20% copper 1920–1952 5.83 g 23.62 mm 80% silver, 20% copper dime 1920–1966 2.33 g 18.034 mm 80% silver, 20% copper