The Ruler Guild can issue a tax in gold upon all the resources that are mined in a province, which is in "Civilized" mode.
Calculation of the mining tax in a Civilized Province
1. The hero, who will mine certain resource, deposits a sum of gold to the Ruler Guild, which is equal to the maximum possible amount of resources for any given AP amount, multiplied by the average resource auction price for the previous day. The gold must be present in the hero's purse, in order to be deposited.
2. If the hero has not managed to extract the maximum possible amount of resource, the difference will be refunded to him, and everything else will be added to the Ruler Guild's Treasury.
3. If the hero is engaged during his mining, his entire gold deposit will be refunded to him, meaning - the Ruler Guild will not receive anything.
4. The tax amount can vary between 0% and 30% from the base sum, as it is in 1.
Example:
The hero wants to mine Coal for 30 Action Points, which mining amount is 2-4 and its average auction price for the previous day was 200, with the Mining Tax set to 30%.
The maximum possible amount of extracted Coal will be 120.
Meaning, the deposit will be (120x200)x30%=8000 Gold.
If the hero manages to mine 100 Coal, the Ruler Guild will receive 6000 Gold, and 2000 Gold will be refunded to the miner.