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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 .
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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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 ...
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 ...
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.
Silver coins are one of the oldest mass-produced form of coinage. Silver has been used as a coinage metal since the times of the Greeks; their silver drachmas were popular trade coins. The ancient Persians used silver coins between 612–330 BC. Before 1797, British pennies were made of silver.
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