A sort of continuation of the discussion below, which was creeping off my screen.

A short thought experiment I did some years back.

That’s a lot of money for just one asteroid.

Large quantities of resources are best moved through space on slow orbits, in a train of intermittent launches to create a “pipeline.” Think coal moving on trains across a continent. Mass drivers can launch simple metals and ores from asteroids, and theoretically a “mass catcher” can retrieve them at the other end, although this is tricky. Atmospheric braking of giant masses of metal is not something I’d like to bring up to an insurance company. The more refining and “cooking down” you can do onsite, the less the transportation becomes an issue.