Quote:
Originally Posted by thrash
*Radioactives are mostly not, in fact, good asteroidal resources. They are concentrated by the geological processes that occur on planetary surfaces.
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That statement is true of just about any resource you might name. They're a bit better for finding siderophile minerals because most of Earth's supply is trapped in its core, but it's still along the lines of "purify a thousand tons of iron to get a kilogram of platinum", and more problematically, there isn't a "mother lode" out there, one nickel-iron asteroid has the same stuff in it as another.