Gold extraction is most economical in large, easily mined deposits. Ore grades as little as 0.5&
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Physically, the coin is 30.6 mm in diameter, weighs 12.50 grams and is made of.900 pure silver. It carries.3617 troy ounces of silver, about 1/3rd of a troy ounce. Three Walking Liberty halves contain just over 1 troy ounce of silver.