This is not a trivial question when you touch on mining-related issues. One can only become that rich by an artificial scarcity that is created when one person/company "owns" a part of land it bought way below value (since the true value should include all the billions of mined material). Also, anyone could mine the land, so it's not like farming, where skill really matters.
I don't think there can be a trivial answer to this question of who has the money that, in practice, is just lying there for the taking
I don't think there can be a trivial answer to this question of who has the money that, in practice, is just lying there for the taking