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The coinage metals comprise those metallic chemical elements and alloys which have been used to mint coins. Historically, most coinage metals are from the three nonradioactive members of group 11 of the periodic table: copper, silver and gold. Copper is usually augmented with tin or other metals to form bronze.
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Group 11 is also known as the coinage metals, due to their usage in minting coins [2] —while the rise in metal prices mean that silver and gold are no longer used for circulating currency, remaining in use for bullion, copper remains a common metal in coins to date, either in the form of copper clad coinage or as part of the cupronickel alloy.
This page was last edited on 25 September 2022, at 00:29 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.
Nickel alloys are among the main metals used in today's coins but they are harder than other legacy coinage metals such as silver and gold alloys and therefore they cause even quicker die wear. Copper and copper alloys have been used in coinage for centuries because of their malleability and the ease with which they can be coined: however ...
As well as circulating coins, where they are generally restricted to high-denomination coins, bi-metallic coins are often used in commemorative issues, often made of precious metals. For example, the only bi-metallic coin issued by the United States is the $10 Library of Congress commemorative , made of a gold ring around a platinum center.
Due to inflation, the current coinage now consists of Rp25, Rp50, Rp100, Rp200, Rp500 and Rp1,000, although older Rp1 coins remain officially legal tender for completeness. Unlike coinage of the Netherlands Indian gulden (which in higher denominations were made of silver or gold), circulating rupiah coinage has always been formed of base metal.
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