I think 3.7 billion $ worth of Strontium , 500 million $ worth of Cerium , 460 million $ worth of Fe2O3 and 100 mill $ worth of Lanthanum are our best bets. The rest of the stuff is either too cheap (and probably not worth mining) or the amounts are too scarce ( gold for example ) Still that makes the total of up to 5 billion $. JMO
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