Asteroids as minerals: scientists explain what can actually be mined in space

When corporations draw presentations with platinum asteroids and endless resources, a group of European scientists carefully lay chemistry, physics, and economics under these slides - and suddenly it turns out that the path from the "space El Dorado" to real profits is much longer and more expensive than investors were promised.

An international team of researchers from Spain and other countries has published in the journal Monthly Notices of the Royal Astronomical Society a detailed analysis of the chemical composition of carbonaceous chondrites, a special class of meteorites considered analogous to small asteroids, potentially suitable for space resource mining.^{1 2} Based on mass spectrometry of samples from NASA collections and European institutes, scientists assessed which elements are actually contained in these rocks, how heterogeneous they are, and whether it makes sense to build space mining business models on them.^{1 3} The conclusion is much more restrained than in the startup presentations: full-scale “metal mining on asteroids” still seems technologically distant and economically dubious, while a more realistic direction is the local use of water and minerals to support missions to the Moon and Mars.^{1 3 4} .

What the Phys.org study is really about

The publication on Phys.org summarizes years of work by a group from the ICE-CSIC Institute for Space Sciences and affiliated laboratories, who have systematically studied carbonaceous chondrites, one of the oldest and most primitive types of meteorites that preserve the chemical "fingerprint" of the early Solar System.^{1 2} . Unlike the advertising descriptions of “golden asteroids,” these rocks contain a wide range of elements — from light to heavy metals, but in proportions and forms that are far from always convenient for industrial extraction, especially in microgravity conditions.^{1 3} The researchers analyzed the six most common classes of carbonaceous chondrites using high-precision mass spectrometry to determine the content of iron, nickel, platinum group metals, rare earth elements and volatile components associated with water.^{1 3 4} .

The results were twofold: on the one hand, asteroids can indeed be a source of valuable elements and, no less importantly, water in the form of hydrated minerals; on the other hand, their internal heterogeneity and structural complexity mean that finding the “perfect rock” with concentrated metal richness will be much more difficult than simple models and infographics suggest.^{1 3 5} Against this backdrop, the researchers draw a careful but important conclusion: space mining should not be seen as a quick way to “bring resources to Earth,” but as a long-term direction for ensuring the autonomy of future deep space missions.^{1 3 4} .

What are carbonaceous chondrites and why are they important?

Carbonaceous chondrites are a class of meteorites containing significant amounts of carbon, hydrous minerals, and organic compounds; they are thought to be fragments of "undifferentiated" asteroids that have not undergone melting and stratification into a core and mantle.^{1 2 4} Their value to science is twofold: on the one hand, they carry information about the composition of the protoplanetary nebula from which the planets formed; on the other hand, they are natural samples of what potentially awaits us in the asteroid belt and among near-Earth objects.^{1 2 5} The problem is that such meteorites only make up about 5% of the total number of recorded falls, and many are so fragile that they disintegrate in the atmosphere or upon impact with the Earth's surface, so sample collections remain relatively limited.^{1 2 4} .

The ICE-CSIC team, which is the international repository for NASA's Antarctic meteorite collection, was able to assemble a unique set of carbonaceous chondrites of different types and origins.^{1 3} This allowed them to compare their composition, find out which classes most closely resemble potential objects in orbit, and assess where “resource” targets might be hiding — for example, asteroids with a high content of water or specific metals.^{1 3 5} .

Chemistry vs. Hype: What Sample Analysis Showed

Mass spectrometry measurements have shown that carbonaceous chondrites contain a wide range of elements, but in most cases in concentrations far removed from the "high-metal ores" that the mining industry on Earth is accustomed to.^{1 3 5} . The levels of platinum metals, rare earth elements, and some other strategically important components turned out to be potentially interesting, but distributed so unevenly that their actual extraction in space would require very complex and energy-intensive separation and enrichment technologies.^{1 3 5} In other words, unlike romanticized descriptions of a "solid platinum rock," a real asteroid more often resembles poorly mixed concrete, with valuable "pebbles" scattered throughout the otherwise useless mass.^{1 3 4} .

A separate block of analysis concerned water: carbonaceous chondrites contain minerals with hydroxyl groups in their structure, as well as other water-containing phases, which makes them promising for future missions that will require local sources of water and oxygen.^{1 3 4} The authors emphasize that for “in-situ resource utilization” tasks — for example, producing rocket fuel or supporting life on orbital bases — such asteroids could be much more valuable than for the “take the metal to Earth and sell it on the stock exchange” scenario.^{1 3 6} .

Why "primitive" asteroids are not yet suitable for mining

One of the key conclusions of the work is that undifferentiated, "primitive" asteroids — the same parent bodies for carbonaceous chondrites — so far appear to be poor candidates for large-scale metal extraction.^{1 3 5} Their formation history, rich in collisions and thermal influences, has led to strong heterogeneity, and physical properties - such as low density, high porosity and the presence of loose regolith - make it difficult to create stable mining complexes under low gravity conditions.^{1 3 6} Any technique that will work on the surface risks simply scattering valuable material around, rather than collecting it in a controlled volume.^{1 3 6} .

Instead, the authors point to another type of potentially attractive object—asteroids with distinct spectral bands of olivine and spinel, which may be "purer" in composition and originate from fragments of differentiated bodies where material stratification has occurred.^{1 3 5} Such objects could theoretically contain more concentrated metal phases suitable for mining, but their identification and confirmation of nature would require targeted sample collection missions and detailed remote sensing.^{1 3 4} .

Sample Missions: From Theory to Practice

The work of Spanish researchers overlaps with the trend of recent years: the transition from remote observations of asteroids to actual missions to collect and return samples.^{1 4 7} Missions such as the Japanese Hayabusa and Hayabusa2, as well as the American OSIRIS-REx, have shown that even a relatively small amount of material from an asteroid can radically change the understanding of its composition and structure, as well as provide answers to questions that cannot be resolved from spectral data alone.^{7 8} Now new projects are joining this chain: in particular, ESA and NASA programs related to the study of objects potentially suitable for mining or deflection^{7 9} .

The authors of the article explicitly write that “comprehensive chemical analysis of carbonaceous chondrites should go hand in hand with new sample return missions,” which will allow us to test how well meteorites on Earth represent their parent asteroids.^{1 3} In other words, to plan future mining, you need to not only “count potential trillions of dollars” in presentations, but also have real measured parameters of potential targets — from density and strength to the distribution of useful elements in the rock mass.^{1 3 4} .

Mining technologies: main bottlenecks

Even assuming that the perfect target asteroid is found, the engineering part of the task remains enormous.^{1 3 6} . Mining in microgravity means that traditional mining technologies — drilling, crushing, transportation — require radical adaptation, and systems for fixing equipment to the surface must be “soft” enough not to destroy the structure of the object.^{1 3 6} Add to this the requirement for full automation or a high level of autonomy, as communication delays and risks to the crew make the constant presence of people on such objects extremely expensive and dangerous.^{3 6 9} .

A separate issue is the processing and disposal of waste: researchers emphasize that the mass processing of rocks in orbit will create a new class of environmental risks - from dust and debris that can threaten spacecraft, to the uncontrolled formation of "artificial debris" on unstable trajectories.^{1 3 6} Therefore, any serious space mining plans must include waste management models and an assessment of their impact on both the local asteroid environment and the wider space environment.^{3 6 9} .

Planetary Defense Connection

Interestingly, the discussion about asteroid mining is taking place in parallel with the development of planetary defense programs — and at certain points these two directions are beginning to intersect.^{7 9 10} NASA's DART mission, which deliberately crashed into the small satellite of the asteroid Didymus Dimorphos in 2022, proved that a kinetic impactor can change the orbit of a celestial body, and ESA's Hera mission, launched in 2024, is now heading to the Didymus–Dimorphos system to measure the effects of this collision in detail.^{7 9 11} The same data needed to change an asteroid's trajectory are also critical for assessing its resource potential: composition, structure, density, porosity.^{7 10 11} .

In scientific papers prepared for the Planetary Defense Conference 2025, scenarios are already being modeled where an asteroid visit combines reconnaissance for defensive purposes and assessment of possible resources, and different types of impact — from multiple kinetic strikes to more exotic options — are being compared in terms of effectiveness, technological readiness, and side effects.^{8 10 12} Against this backdrop, the study of carbonaceous chondrites looks like another piece of the puzzle: understanding what future missions are dealing with will determine both how we deflect asteroids and whether it makes sense to try to develop them as “deposits” at all.^{1 3 8} .

Economics and law: space resources without illusions

Beyond the labs, the question of asteroid mining hinges not only on technology, but also on market structure and international law.^{3 6 13} . An excess of a metal, say platinum, if it suddenly appears in significant quantities on the market, can collapse its price, making the project unprofitable long before the return on investment; therefore, even a hypothetical “gold vein” in space does not guarantee earthly profit^{3 6 13} Added to this is the uncertainty of the legal regime: The Outer Space Treaty prohibits national annexation of celestial bodies, but does not provide a clear answer as to where exactly the line between “resource use” and de facto private ownership of part of an asteroid lies.^{3 13 14} .

A number of countries — the USA, Luxembourg, the UAE — have already adopted national legislation allowing their companies to claim resources extracted from space, but there are no universal rules of the game yet.^{13 14} Against this background, a sober scientific assessment of the real “content” of asteroids becomes an important counterweight to the excessive optimism of space mining promoters: before sharing profits, it is worth at least understanding whether there is anything to share.^{1 3 13} .

What does this mean for Ukraine and the region?

For Ukraine, which has a developed school of space technology and materials science, but limited resources, such research sets an important benchmark: in the coming decades, the main interest will lie not in the "space export of metals", but in applications related to supporting missions and infrastructure in orbit and beyond.^{3 4 6} This means that investments in remote sensing sensors, regolith processing technologies, and closed-loop waste treatment and disposal systems may be much smarter than trying to jump on the asteroid mining hype with promises of a quick return on investment.^{3 6 9} .

Ukrainian scientific groups working with meteorites, spectroscopy, and models of small body evolution could integrate into international consortia evaluating potential targets for future missions, offering their expertise in fields ranging from geochemistry to orbital dynamics.^{3 7 9} In the longer term, participation in projects to use extraterrestrial resources — not only asteroids, but also the Moon — may become one of the ways for Ukraine to establish itself in the new architecture of the space economy, where the “space race” is joined by the race for the ability to live and work outside the Earth.^{4 6 9} .

Where is the asteroid mining topic heading next?

The authors of the study, despite a cautious assessment of the current potential, do not reject space mining as such - rather, on the contrary, they propose to shift the discussion from the plane of "easy money" to the plane of long-term investments in technology and science.^{1 3 4} They explicitly state that the search for resources in space can help reduce pressure on Earth's ecosystems, but only if the energy, technological and environmental costs of each stage are honestly calculated - from the launch of the spacecraft to the processing of material and waste management.^{1 3 6} In the near term, the most realistic scenarios seem to be where resources from asteroids are used locally — for refueling interplanetary ships, building and maintaining stations — while a “gold rush” with a collapse of the terrestrial platinum market remains in the realm of venture marketing fantasies.^{1 3 4} .

Scientists are confident that progress will come, and quite quickly: the need for autonomous sources of water and materials for missions to the Moon and Mars will force space agencies and private companies to experiment with small-scale extraction and processing systems in the coming decades.^{1 2 4} The only question is whether the political and business component of this story will be able to catch up with the scientific one: the willingness to invest in slow but realistic work on studying asteroids and developing technologies weighs much more here than the loud promises of quick trillions from space.^{1 3 6} .

Sources

1. Phys.org: "A pioneering study on the feasibility of asteroid mining" — a review of research on the composition of carbonaceous chondrites and conclusions on the potential for asteroid mining
2. Monthly Notices of the Royal Astronomical Society: original paper by the ICE-CSIC research group on the chemical analysis of carbonaceous chondrites
3. ICE-CSIC, GEO3BCN-CSIC: researchers' comments on the technological and environmental challenges of space mining and the role of carbonaceous chondrites as asteroid analogues
4. NASA / JAXA materials on the OSIRIS-REx, Hayabusa and Hayabusa2 missions: experience in returning asteroid samples and their contribution to understanding the composition of small bodies
5. Analytical reviews on planetology: classification of asteroids, the role of primitive and differentiated bodies in the context of resources
6. International publications on the economics of space resources: assessing market risks, energy costs and comparison with mining on Earth
7. ESA / NASA: description of the DART and Hera missions, their contribution to understanding the properties of asteroids and the potential for their "control"
8. Proceedings of the Planetary Defense Conference 2025: Simulation of reconnaissance and deflection missions for the 2024 PDC25 hypothetical asteroid
9. Planetary Society, popular science resources: reviews of planetary defense strategies and the connection between asteroid defense and resource use
10. International space law: documents and comments on the regime for the use of extraterrestrial resources and national laws of the USA, Luxembourg, UAE
11. Space Policy and Economics Reviews: Analyzing the Role of Asteroid Mining in Shaping Future Space Infrastructure

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