2016 $1 Australia's First Mints Growth From Gold 'C' Mintmark Silver Proof CoinThe discovery of gold within Australian soil led to a period of intense growth during the 19th century. This valuable metal was sourced from Australian earth and converted to unofficial currency at the Adelaide Assay office and official currency at Royal Mint branches established in Sydney, Melbourne and Perth. To celebrate gold coinage in Australias history, this coin features design elements from the Sydney Mint One Sovereign the only sovereign