Australian Dollar - Coins

Coins

In 1966, coins were introduced in denominations of 1, 2, 5, 10, 20 and 50 cents. The initial 50 cent coins contained high silver content and were withdrawn after a year after it was found that the intrinsic value of the silver content exceeded the face value of the coins. One-dollar coins were introduced in 1984, followed by two-dollar coins in 1988. The one- and two-cent coins were discontinued in 1991 and withdrawn from circulation. In commemoration of the 40th anniversary of decimal currency, the 2006 mint proof and uncirculated sets included one- and two-cent coins. Cash transactions are rounded to the nearest five cents. As with most public changes to currency systems, there has been a great amount of seignorage of the discontinued coins. All coins portray the reigning Australian Sovereign, Queen Elizabeth II, on the obverse, and are produced by the Royal Australian Mint.

Australia has regularly issued commemorative 50-cent coins. The first was in 1970, commemorating James Cook's exploration along the east coast of the Australian continent, followed in 1977 by a coin for Queen Elizabeth II's Silver Jubilee, the wedding of Charles, Prince of Wales and Lady Diana Spencer in 1981, the Brisbane Commonwealth Games in 1982, and the Australian Bicentenary in 1988. Issues expanded into greater numbers in the 1990s and the 21st century, responding to collector demand. Australia has also made special issues of 20-cent and one-dollar coins.

Current Australian 5-, 10- and 20-cent coins are identical in size to the former Australian, New Zealand and British sixpence, shilling and two shilling (florin) coins. In 1990, the UK replaced these coins with smaller versions, as did New Zealand in 2006 - at the same time discontinuing the five-cent coin. With a mass of 15.55 grams and a diameter of 31.51 mm, the Australian 50-cent coin is one of the largest sized coins used in the world today. In circulation, the old New Zealand 5-, 10- and 20-cent coins were often mistaken for Australian coins of the same value, owing to their identical size and shape.