As far as I'm aware, metals and fishing do not contribute to the Government Pension Fund of Norway, which is why I did not include them on the Norwegian side and similarly only looked at the top items on the Australian side (eg adding Refined Petrolium on the Autralian side would push the balance closer to 2 again).

Point is, while Australia isn't quite as well off as Norway, there are resources aplenty to pull off something similar on a somewhat smaller scale.