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Don’t expect U.S. coin compositions to change any time soon, and never for the penny. There are “no alternative metal compositions that reduce the manufacturing unit cost of the penny below its face value,” according to the United States Mint 2014 Biennial Report to Congress on the research and development (R&D) of alternative metals for circulating coins.

Read more at: http://www.coinnews.net/2014/12/15/us-mint-not-recommending-new-coin-compositions/