The central function of the banking system in Prospectors is to provide citizens the service of converting mined Gold into the ‘in-game’ Gold by depositing it in their bank account. Only after the Central Bank construction is finished, citizens will be able to convert mined gold into ‘in-game’ gold.
In order for a citizen to convert mined gold into gold on his account, his worker has to bring the mined gold in his backpack to the Bank. Then the player should confirm the action of conversion.
Banks will provide different services and earn commissions in the process. The commission at the Central Bank is fixed and amounts to 10 % of the amount of convertible gold.
Your worker must be at the Central Bank location(-01/00), in order to convert their gold.