Helium-3 Mining on the Moon: The Real Math Behind the Hype

Helium-3 is the poster child of lunar resources: a fusion fuel that produces protons instead of neutrons, implanted into the Moon's surface by billions of years of solar wind. It's also present at concentrations that make gold mining look like scooping gravel. Both halves are true, and the free Lunar Helium-3 Mining Planner lets you hold them together honestly.

The concentration problem

Good mare regolith holds roughly 4–20 parts per billion helium-3 by mass. At 8 ppb, extracting a single kilogram means heating about 125,000 tonnes of regolith to ~700°C to release the gas, then cryogenically separating He-3 from the thousand-times-more-abundant He-4. A tonne per year — a meaningful fraction of a fusion economy's fuel — implies moving something like 125 million tonnes of regolith annually: strip-mining at terrestrial-industry scale, on the Moon.

Why serious people still care

Because the value density is unmatched: at commonly cited prices around $1–3B per tonne, He-3 is one of the only lunar exports where the payload value per kilogram exceeds even early launch costs by orders of magnitude. And critically, He-3 extraction is nearly free if you're already processing regolith for oxygen, propellant and construction material — the heating step is shared. That's the integrated-ISRU insight: He-3 is a by-product play, not a standalone mine.

Run the numbers

The mining planner takes excavation rate, concentration and power cost and returns yield, energy demand and revenue; the Lunar ISRU Optimizer shows the shared-infrastructure version, and the Space Economy Economics Engine folds it into a full lunar business case. Power the whole operation with the Lunar & Orbital Power Architect — tools that chain into each other with one click.

FAQ

Does He-3 fusion even work?

D-He3 fusion is real physics with a higher ignition bar than D-T. No reactor has achieved it commercially — He-3 mining is a bet on second-generation fusion.

Is anyone actually pursuing it?

Yes — it features in Chinese lunar program statements and several startups' plans; near-term He-3 demand also exists in cryogenics and neutron detection, at smaller scale.

Are these calculators engineering-grade?

No — they're transparent first-order models with adjustable public assumptions, built for learning and honest debate.