A literal handful of helium-3 has been priced at around $20 million based on investor valuations.
Notes on verification
Multiple outlets (Newsweek, SpaceNews, Space.com, Lowy Institute) cite the $20 million/kg figure, but all trace back to a single primary source—Interlune CEO Rob Meyerson—rather than independent valuations, so corroboration is broad but not deeply independent.
Sources
- Inside NASA's audacious plan to build a nuclear-powered ... (nationalgeographic.com)
- https://www.newsweek.com/interlune-lunar-mining-helium-3-moon-2103195 (newsweek.com)
- https://spacenews.com/interlune-plans-to-gather-scarce-lunar-helium-3-for-quantum-computing-on-earth/ (spacenews.com)
- https://www.lowyinstitute.org/the-interpreter/real-battle-moon-s-resources-here-earth (lowyinstitute.org)
- https://www.space.com/astronomy/moon/mining-the-moon-can-you-make-money-harvesting-helium-3 (space.com)