Silvery coloured Australian Coins in general circulation are the 5, 10, 20 and 50 cent coins.
Their composition is 75% copper and 25% nickel.
There is no silver in any circulating Australian coin.
There are many places online that one can buy Australian coins as well as many local stores that one can visit. One of the most popular places that one can buy Australian coins is the Australian website perthmint.
There were 4,337,200 Australian 1997 50 cent coins minted.
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The Royal Australian Mint Canberra has produced over 13 Billion coins since it commenced production in February, 1965.
Silver
The Royal Australian Mint produced 19.031 million standard cupro-nickel 50 cent coins.
It depends on the denomination.
The Royal Australian Mint advises that from 1984 to 2009, approximately 754.246 million Australian One Dollar coins have been minted for general circulation.
100silver=1gold
Silver coins can be purchased from a number of places in the US. You can purchase silver coins directly from the United States Mint, and most cities contain many stores for buying and selling silver and gold coins.
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Many coin dealers and jewelers buy gold & silver.