The Australian Nugget A rare Australian limited edition 1 kilo gold nugget 9999gminted, with the central roundel of a leaping red kangaroo within a sunburst border and dated 1991. Note: 1991 was the first year for Australian minted I kilo coins. the face value of $10,000 at the time, was the highest value to be minted. That year only one hundred coins were minted of which ninety five were issued