Good reason to mine the Moon

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