@gerikson @techtakes The thing about Lunar 3He mining is … it presupposes you can build aneutronic fusion reactors (a 3rd generation fusion reactor: not simple!). But if you can fuse 3He, you’re almost certainly able to run a P + 11B reactor (which is also an aneutronic reaction), and hydrogen and boron are readily available on Earth. Thereby removing the entire incentive to strip-mine the moon at vast expense.

TLDR: Lunar 3He is a non-working economic justification for space colonization.