I understand all that but our problem is that the ore has to come down eventually and in big enough quantities to make it useful. This is best achieved in my space elevator senario rather than using rockets of any kind be they poluting or not.
Of course that still does not mean a space elevator is even feasible, it's concievable allright but the technical details are so big I would say it would have to be a global project.
Failing all that we might build some sort of container that falls down from orbit with the decelaration slowed by simple parachutes, in order to bring down the cost we would probably have to make the container in orbit though. There is a danger though in sending worthwhile amounts down as we would be essentially firing asteroids to earth so it would require no mistakes.
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