Alloys Used In Australian Coins

Royal Mint wants 5¢ coins scrapped

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Coin Rarities & Related Topics: Collecting Dimes | CoinWeek

The U.S. Mint has produced dimes almost every year since 1796. Until 1964, dimes consisted of an alloy of 90% silver and 10% copper. (Actually, dimes produced from 1796 to the first part of 1837 were specified to be 89.24% silver and 10.76% copper.) Originally, the notion was for dimes to contain ten cents worth of silver, and that is the reason why dimes are, and have been, around 40% of the weight of a quarter, which was planned to contain twenty five cents worth of silver. As cents and nickels never contained any silver, it made sense, for a long time, for these to be larger than dimes.

Draped Bust Dimes with a ‘Small Eagle’ reverse (back) were produced in 1796 and 1797. The same Draped Bust obverse (front) design was employed, with a ‘Heraldic’ or ‘Large Eagle’ reverse design, for dimes dating from 1798 to 1807. There are no dimes dated 1799 or 1806, at least I have never seen a 1799 or 1806 dime.

Capped Bust Dimes were minted from 1809 to 1837. The 1822 is the only date that is close to being rare, though a noticeable variety of an 1829 is even rarer.

Starting at some point in 1828, a second subtype of Capped Bust Dimes was introduced. While sometimes referred to as ‘small size,’ this name is misleading as these are only slighter smaller, on average, in diameter. In addition to the introduction of different border devices, there are several subtle differences. More advanced technology was employed to manufacture the second subtype of Capped Bust Dimes.

Liberty Seated Dimes were minted from 1837 to 1891. There are at least five subtypes. As the introduction of stars in 1838 and the addition of arrows in 1853 and again in 1873 are very much apparent, it could be fairly argued that there are five full design types, not ‘subtypes.’ Certainly, a type set of dimes, of Liberty Seated coins, or of U.S. silver coins, should included more than one Liberty Seated Dime. I am here ignoring the ‘No Drapery’ issues as I maintain that these are not really a distinct type and perhaps not a subtype either?

Barber Dimes were produced from 1892 to 1916, the same time span in which Barber Quarters were struck. Mercury Dimes, sometimes called ‘Winged Liberty’ Dimes, were made from 1916 to 1945. The Roosevelt Dime was first struck in 1946. Silver Roosevelt Dimes were minted for circulation until 1964. Copper-Nickel ‘Clad’ Roosevelt Dimes have been minted ever since. Silver Roosevelt Dimes made a comeback in 1992 and subsequent years, though only in Proof format.

Cantor lectures on alloys used for coinage

The Australian gold coins first issued contained a considerable proportion ... An excellent classification of the alloys used in different countries will be ...

English mechanic and world of science, with which are incorporated "the Mechanic", "Scientific opinion," and the "British and foreign mechanic."

The Australian gold coins first issued contained a considerable proportion of silver, ... In the case of gold, such triple alloys have been used but seldom. ...

Journal of the Society of Arts

1 is, that the idea of the immense amount of silver coin existing in India is .... of alloy ; and the gold mohur-piece of 15 rupees (see clause 7) as of the ...

The Australian encyclopaedia

British silver and bronze coins in circulation when the Australian coins were ... The alloy used, commonly known as q-metal, had been adopted by the Royal ...

Roberts-Austen, a record of his work

The Australian gold coins first issued contained a considerable proportion ... results.3 In the case of gold, such triple alloys have been used but seldom. ...