tl:dr There's absolutely no indication this is practical. We don't know how to fuse He3, it's probably impractical to mine it, and "He3 mining on the moon" is more of scifi wishful thinking mentioned offhand in exactly the manner you just did, than a serious engineering proposal.
tl:dr There's absolutely no indication this is practical. We don't know how to fuse He3, it's probably impractical to mine it, and "He3 mining on the moon" is more of scifi wishful thinking mentioned offhand in exactly the manner you just did, than a serious engineering proposal.