Even though this coin was not being minted for circulation for almost 5 years, the 1971 Canadian British Columbia Silver Dollar (.375 oz Silver) has both Numismatic and precious metal value. It is easily bought or sold anywhere in the world.
The Obverse has a an image of Queen Elizabeth II inscribed with D.G. Regina and her name.
The reverse features British Columbia's coat of arms.
You can find silver prices quickly here.