Australia has two mints, the Royal Australian Mint (which also makes the country's circulating coinage) and the Perth Mint, which are both very active in the bullion coinage space; coins issued by them are legal tender.
Additionally, there are private issuers of bullion which is not legal tender and is targeted at investors and not at coin collectors - such as this one.
The Perth Mint manufactures a range of gold and silver coins and bars to suit all types of investors.
The 1g Minted Gold Bars by the Perth Mint are packaged in serial numbered Tamper Proof Certi Cards and can often be traded internationally without the need for assay.
The mint says about it:
These 99.99% bullion bars are offered in a convenient choice of weights and are stamped with The Perth Mint's London Bullion Market Association (LBMA) registered mark, a symbol of international tradability. The 1g gold bullion minted bar is one of eight sizes, all with The Perth Mint’s internationally recognised "swan" logo on the front and a stylised pattern of kangaroos on the back. | 
Search for Australia: Gold Gram Perth Mint Kangaroo Bar on eBay 
