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Unless it's a proof coin, it's just a dollar, spend it.
That depends entirely on the denomination and condition of the coin in question. As of June 2016, one Canadian dollar is only 77 cents US.
The value of an 1879 Canadian dollar depends on its condition. Such a coin in good condition is valued at about 24.82 US dollars while an uncirculated coin is valued at 42.88 US dollars.
55 in Philippine pesos
The US $1 dollar coin dated 1979 has no silver in it, they are still in circulation if this coin is from pocket change spend it.
As of Feb 9, 2006, one US dollar is worth 1.14515 Canadian dollars, so 50 cents US is worth just over 57 cents Canadian.
Without further details, the best possible answer is that it's worth one dollar.
From your description the coin is a common Susan B. Anthony dollar (1979-1981 & 1999) that is in circulation today. It's just a dollar coin, spend it.
1 US dollar is equal to .9843 Canadian dollar.
The value of an 1896 Canadian half dollar depends on its condition. For example, such a coin in good condition is worth around 11.79 US dollars while an uncirculated coin has a value of more than 500 US dollars.
Whether it's a US Anthony dollar or a Canadian "loonie", it's only worth face value.
The Canadian dollar fluctuates against the U.S. dollar. As of 2012 a Canadian dollar is worth about the same as the US dollar so a Canadian cent is worth essentially one US cent. More to the point would be to ask whether you could spend the coin in the US. It all depends on whether the cashier notices. The coins are similar in size and color and sometimes co-circulate in border states. Illinois may be another matter however.