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With current technology the cost would be far more than the benefits. Even with rail launch technology to get materials back to Earth 'cheaply' the problems of mining and purifying would be horrendous. It is the stuff of science fiction. Robotic miners and plants I doubt it.
We cannot even control 1950's nuclear technology because of cost cutting. The current situation is a grim picture of the realities.
When I was a kid I saw a picture of a very long train with coal and it was the equivalent of one pound of U235. We have not got that correct yet.
ALL current nuclear reactors would not exist without taxpayer or weapons manufacture subsidies!
Bert
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