On a Question of Mastery
The logical and rational thinking of the modern world is a literal inhibitor to our ability to imagine a fantastic reality. It crowds out fantastic ideas and results in an incredible sameness to the large numbers of fantasy settings out there. More damaging it makes us unwilling to engage in something that pushes the boundaries of the fantastic due to the frustration of attempting to assimilate a new world order.
The question was, "Where does all this gold come from?"
My first response was from the fantastic realism angle.
So there's that.
I then mentioned that this doesn't even begin to touch upon the realm of the fantastic. Perhaps there are portals deep within the earth, perhaps it is the excrement of giant purple worms that have very cities in their interior, perhaps earth spontaneously cycles through different types of materials.
How many fantastic origins of gold and coins can we list?