According to *Moon Rush*, even the smaller of the Iron-Nickel NEAs contains
more
metals than all that has ever been mined in all of history. Further, our
Moon, riddled with craters from such collisions is likely to be rich in such
resources, as well. A single Diablo Canyon size impactor would have left
between 450 million to 1.77 billion tons
of economically recoverable nickel, iron, cobalt, &=platinum group metals
materials, worth around $20 trillion.
http://billionyearplan.blogspot.com/2009/02/will-need-of-rare-earth-metals-for.html

Right. The question is, where are those deposits? Our older lunar data
wasn't good enough to spot them. But there's a wealth of new data
that's been collected in the last few years. Anybody know whether those
include the right sort of instruments to detect platinum group metals on
the lunar surface?