One of the best examples concerns the Empire of Mali in Africa.
It is only recently that Mansa Musa, is recognised as the richest man in the world. He lived from 1280 to 1337 and ruled the Mali Empire in West Africa.
This Empire was the leading producer of gold in the world.
Obviously, a lot of gold used in Europe, gold mentioned in Biblical times, came from Africa.
Did any of the ancient kingdoms covered by standard history have gold mines?
Where were they?
Clearly, the gold came from somewhere. And it was known where; Africa.