The Physical and Chemical Makeup of Asteroids

Researchers at ICE-CSIC selected and characterized meteorite samples that were later analyzed using mass spectrometry at the University of Castilla-La Mancha by Professor Jacinto Alonso-Azcárate. This detailed chemical analysis focused on the six most common types of carbonaceous chondrites, offering new insight into whether these asteroids could be viable targets for future resource extraction.

Figure 1. Ancient Asteroids Offer Clues to Future Space Mining.

The Asteroids, Comets, and Meteorites research group at ICE-CSIC studies the physicochemical properties of materials found on asteroid and comet surfaces and has made significant contributions to the field over the past decade. “At ICE-CSIC and IEEC, we develop experiments to better understand asteroid materials and how space-based physical processes shape their composition and mineralogy,” says group leader Trigo-Rodríguez. Figure 1 shows Ancient Asteroids Offer Clues to Future Space Mining

For more than a decade, Trigo-Rodríguez has been involved in selecting and requesting several of the carbonaceous chondrites analyzed in this study from NASA, as well as designing multiple experiments using them. ICE-CSIC serves as the international repository for NASA’s Antarctic meteorite collection, making it a key hub for this work. “The research now being published represents the culmination of a long-standing team effort,” he notes.

“Studying and selecting these meteorites in our clean room using a range of analytical techniques is fascinating, especially because of the diversity of minerals and chemical elements they contain,” says Pau Grèbol Tomás, a predoctoral researcher at ICE-CSIC. “However, most asteroids contain relatively low abundances of precious elements, so our goal has been to determine to what extent their extraction could realistically be viable.”

Most small asteroids are covered in fragmented surface material known as regolith, which could make the return of limited samples easier. “That said, developing large-scale collection systems capable of delivering meaningful benefits is a very different challenge,” explains Jordi Ibáñez-Insa, a researcher at Geosciences Barcelona (GEO3BCN-CSIC) and co-author of the study. “Even so, it is worth exploring, as space-based resource extraction could potentially reduce the environmental impact of mining activities on Earth.”

The Future of Exploration and Resource Extraction on Small Asteroids

Given the wide diversity of objects in the main asteroid belt, identifying which types of resources might be available is essential. “Asteroids are small and highly heterogeneous bodies, shaped by their evolutionary histories—particularly collisions and close encounters with the Sun,” says Trigo-Rodríguez. “If we are searching for water, certain asteroids linked to hydrated carbonaceous chondrites are promising candidates, although they tend to contain fewer metals in their native state.”

After 4.56 billion years of evolution, each asteroid possesses a unique composition. “This diversity is clearly reflected in the chondritic meteorites we study,” he adds.

One of the study’s key conclusions is that mining undifferentiated asteroids—primordial remnants of the solar system’s formation and the parent bodies of chondritic meteorites—remains far from feasible with current technology. However, the researchers identify a specific class of pristine asteroids, characterized by olivine and spinel spectral bands, as potential future mining targets. To pinpoint such candidates, comprehensive chemical analyses of carbonaceous chondrites are essential, though the team emphasizes that these efforts must be paired with new sample-return missions to confirm the identities of their progenitor bodies.

“Beyond the advances made through sample-return missions, we urgently need companies willing to take decisive steps in developing the technologies required to extract and collect materials in low-gravity environments,” says Trigo-Rodríguez. “Equally important is understanding the environmental impact of processing these materials and managing the waste generated, which must be properly quantified and mitigated.”

The researchers are optimistic about near-term progress, noting that the use of in-situ resources will be critical for future long-duration missions to the Moon and Mars by reducing reliance on resupply from Earth. If water extraction is the primary objective, they stress that water-altered asteroids rich in hydrated minerals should be prioritized.

Accessing and processing these resources under low-gravity conditions will require entirely new extraction techniques. “It may sound like science fiction,” says Pau Grèbol Tomàs, “but the same was said about the first sample-return missions when they were proposed three decades ago.”

On the international stage, several ambitious concepts are already under discussion, including capturing small near-Earth asteroids and placing them into circumlunar orbit for resource exploitation. “For certain water-rich carbonaceous asteroids, extracting water for reuse—as fuel or as a primary resource for deeper space exploration—appears increasingly viable,” explains Trigo-Rodríguez. “This approach could also advance our scientific understanding of bodies that may one day pose a threat to Earth. In the long term, mining potentially hazardous asteroids could even reduce their size and eliminate their danger.”

Source: SciTECHDaily

Cite this article:

Priyadharshini S (2025), Ancient Asteroids Could Reveal the Blueprint for Space Mining, AnaTechMaz, pp.640