Mining Asteroids and the Moon

The idea of extracting resources from space, what might be valuable, the legal questions, and why it remains far off.

Asteroids and the Moon contain metals, water and other resources. Some entrepreneurs and space agencies see space mining as a future industry. For now, it remains mostly an idea.

What might be valuable

Water ice on the Moon, especially in shadowed craters near the poles, could be turned into drinking water, oxygen and rocket fuel for missions further into space. India’s Chandrayaan-1 mission helped confirm water on the Moon in 2009.
Metals such as platinum-group metals in some asteroids.
Helium-3 on the Moon, sometimes discussed as a potential fuel for future fusion power.

Using resources in space

Many experts think the most realistic early use is in-space resource utilisation: using space resources in space, rather than bringing them back to Earth. Launching water and fuel from Earth is expensive, so producing them on the Moon could lower the cost of exploration.

The legal questions

The Outer Space Treaty of 1967 says no country can claim sovereignty over the Moon or other celestial bodies. But it is unclear whether companies can own resources they extract. The United States passed a law in 2015 allowing U.S. citizens to own space resources they obtain, and Luxembourg and others passed similar laws. The U.S.-led Artemis Accords, signed by many countries, including India in 2023, set principles for space resource use.

Why it is far off

Enormous costs of reaching and operating on asteroids or the Moon.
Technical challenges of mining in low gravity and harsh conditions.
Uncertain demand: bringing large amounts of metals back could lower their prices on Earth, reducing profits.

Several early asteroid mining start-ups closed or changed focus in the late 2010s.

Fuel stations in space

A spacecraft heading to Mars must carry all its fuel from Earth, which requires a huge rocket. If water from the Moon could be split into hydrogen and oxygen to make rocket fuel, spacecraft could refuel on the way, like a car at a petrol station. This is why lunar water is seen as more valuable in space than on Earth.

Thinking space mining will soon flood Earth with cheap metals

The costs and challenges are immense, and space mining faces legal and economic uncertainties. Its first uses, if any, are likely to support space activities rather than supply metals to Earth.

Key takeaways

Space resources include lunar water ice, asteroid metals and possibly helium-3.
Using resources in space, like lunar water for fuel, is the most realistic early use.
The 1967 Outer Space Treaty bans national sovereignty over celestial bodies.
Costs, technical challenges and uncertain demand make space mining a distant prospect.