> Or over tens of millions of years would more naturally occurring easy to find veins of gold and silver rise to the surface of the Earth's crust? i am not a g

> Or over tens of millions of years would more naturally occurring easy to find veins of gold and silver rise to the surface of the Earth's crust? i am not a geologist but, as i understand it, plate tectonics cause a lot of "churn" in the crust. so i think it is certainly conceivable that a civilization could mine all the accessible veins to exhaustion but have many more veins brought up near the surface in the following 60 million years.