I think of this, when people start hoarding gold and other precious metals.
With gold at record prices this stuff starts creeping into the realm of "way more plausible than many would give credit for". The ultimate supply of gold, when one extends ones vision to the solar system itself, is quite large relative to limiting oneself to our planet.
Because of the mechanics of planetary formation, the asteroids in our solar system are much much higher in terms of concentrations of metals than the earth's crust.
Honestly, I am not too sure about the moon's surface make-up in terms of how accessible metals might be. It is not altogether siesmically active, with a "cool" core, but the violence of its theorized formation might allow for a greater uniformity of mixture than earth's light-element crust. Hmmmm. Yet another interesting tidbit to look into.

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