This coin was struck in several varieties so you would need to have it inspected in person by a dealer or appraiser who handles Canadian coins.
If it really is a silver dollar, there were two varieties: the 'Edmonton University Games' and the 'Toronto Sesquicentennial'. They weighed 23.3276 grams and were composed on 50% silver and 50% copper. The actual silver weight (ASW) is 0.3750 oz troy. At a spot value if $35 per oz, the silver is worth $13.13USD.