The Australian one cent coin is the smallest denomination coin of the Australian dollar. Together with coins of the two cents denomination, it was withdrawn from circulation in February 1992. The coins were not demonetised though and remain legal tender.
In 2011, the Royal Australian Mint struck some in silver as an item for collectors. They are of Proof grade only and were issued in a pair (one cent and two cents only, not a full mint set).
The coins weigh 2.93 grams and have purity of 0.999 silver (0.0941 oz. ASW).