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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.
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.
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Common base metals used in coinage include nickel and copper. beading A raised dot border along the rim of a coin. billon A low-grade alloy of gold or silver with a high percentage of another metal, usually copper. [1] Billon is often produced in response to a sudden debasing of circulating silver coinage due to hyperinflation. bi-metallic coin
The best known precious metals are the precious coinage metals, which are gold and silver. Although both have industrial uses, they are better known for their uses in art , jewelry , and coinage. Other precious metals include the platinum group metals: ruthenium , rhodium , palladium , osmium , iridium , and platinum , of which platinum is the ...
Patterns of the same design were struck in other metals, including aluminum, copper, normal coin silver, lead, and white metal. In the end, goloid was rejected as a coinage metal because it could not be distinguished from the normal U.S. 90% silver coin alloy without chemical analysis, thus inviting counterfeiters to use silver-copper alloys ...
The Indonesian one thousand rupiah coin (Rp1,000) is a coin of the Indonesian rupiah.It circulates alongside the 1,000-rupiah banknote. First introduced on 8 March 1993 as bimetallic coins, they are now minted as unimetallic coins, with the first of its kind appearing in 2010 and its latest revision being in 2016.
For new coinage, the old style of a large number was replaced instead with the national Garuda Pancasila logo, with the year and "BANK INDONESIA" in smaller text below the emblem. A 25 rupiah coin dated 1991 in aluminium, with images of nutmeg and its Indonesian text 'buah pala' and "Rp 25" on the reverse, was the smallest coin to be revised.