It takes 8 Gold ore to make one gold bar.
Since "The Jewelry update" (23-6-2020) Gold can no longer be sold to your population. it can however be crafted into Jewelry
Representative money adds wealth to your cities when you have a quantaty of gold stored in your cities.
Representative money will act as a multiplier on your wealth every 10 gold bars give 1%. this can be stacked ad infinitem.
example if your city has 100 wealth and you enact reprasentative currency and you have 10 gold bars stored in one of your settlements then your city wealth will now be 101.