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--- In spacesettlers@yahoogroups.com, "Combs, Mike"
> From: Richard [mailto:rabrooks@g...]
>
> > Mars being closer than most asteroids, would mean that
> > it could supply material (even ores) as cheaply as the
> > asteroid belt.
>
> The expense is not an issue of proximity, it's primarily an issue of
> delta-V. From a delta-V point of view, the surface of Mars is "further
> away" because it's at the bottom of a relatively steep gravity well.
>
How about a solar powered O'Neill type mass driver?