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It is everywhere in high amounts. 1 million tons of lunar dust could make 70 tons of helium-3. A 7 percent yield sounds amazing to me.
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It's not everywhere. It's a scarce isotope of Helium in the solar wind. Anyplace with a magnetosphere repels it. That's why they will have to go to the Moon.
The problem isn't getting the gold or whatever out of seawater, it's getting the water out of everything else. Start with sea salt (and boundless energy) and do a thermal fractionation.