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Since 1982 US cents have been made of copper-plated zinc.

The Mint buys large rolls of zinc stock from metal suppliers. The stock is approximately the thickness of a finished cent, with slight differences to allow for changes during the striking process. The process starts a bit like baking cookies: the stock is unrolled (think of a giant roll of dough) and fed into a press that punches out circular blanks, similar to the way a cutter would press out blanks for making cookies.

The blanks go through a process to clean them of debris and oils. Next they're fed into a machine that squeezes the edges slightly to produce the raised rim seen on all US Coins. After that, the blanks are fed into hoppers that feed high-speed presses that strike the front and back images on each one.

Finally the zinc coins are put into a chemical bath that deposits a layer of copper on the outside, both so that the coins look like their bronze predecessors and so that the underlying zinc won't corrode.

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∙ 13y ago

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