Prior to 1965 and passage of the Coinage Act of 1965 the composition of the US dime, quarter, half-dollar and dollar coins was 90% silver and 10% copper. With the passage of the Act, the current version of the quarter is a cladded coin with two layers of cupronickel (75% copper and 25% nickel), on a core of pure copper. It currently costs 11.14 cents to produce each coin (as of 2011).
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