The Gold coin(s) are part of the MineColony mod. They are used at a Bank after you have added a Town Hall .
Summary
Gold coins can be traded for one of he following items at a Bank:
Gold Coin(s) |
Items gotten from trade(Amount) |
1 |
|
3 |
|
6 |
|
20 |
|
Getting Gold Coin(s)
In order to get gold coins you need to either have a Crafting Table II