Why Mine C-Type Asteroids?

On Wed, Aug 3, 2011 at 11:08 AM, Joe Strout wrote:
(...)
> Of course, even when the impactor is vaporized, in the vacuum of the
> Moon the vapor is just going to fly ballistically and deposit itself
> over the relatively nearby area. So we might expect enrichment of PGMs
> in a thin layer around some craters. But that's not the same as an ore
> body, which is (I suspect) much easier to mine.
(...)

I would also expect some cases of incomplete vaporization with solid
debris ejected from the impact. In any case, even though we would have
just small chunks of minerals spreaded through a radius of hundreds of
miles...