I wrote:
There is some debate about how much of these precious metals are
available elsewhere in the solar system, but I do not think this
matters much. Once you leave the Earth's atmosphere and go to the
moon or an asteroid, you can then use raw solar energy to vaporize
as much low-grade or as you like . . .
I meant "low-grade ore." Regarding the prospects for prospecting the
solar system, see this interesting web site:
http://www.permanent.com/intro.htm
This web site is kind of unorganized. For lunar materials, see:
http://www.permanent.com/l-overvw.htm
Not many metal ores there, at least on the surface. Maybe asteroids
or Mars would be a better choice.
- Jed