A few years back, asteroid mining was a hot topic. As the commercial space sector expanded rapidly, turning space into a commercial frontier seemed within reach.
The idea of using spacecraft to rendezvous with and mine Near-Earth Asteroids (NEAs) and then transport them to space-based processing facilities was almost as ambitious as sending commercial crews to Mars.
After much speculation and the failure of several ventures, planners sidelined these plans, waiting for more advanced technology and the achievement of other key milestones.
Still, the vision of asteroid mining and the “post-scarcity” future it promises persists. Beyond requiring more infrastructure and technological advances, scientists must conduct additional research to understand the chemical makeup of small asteroids.
C-Type Asteroids as Promising Sources of Space Resources
In a recent study, researchers from the Institute of Space Sciences (ICE-CSIC) examined samples of C-type (carbon-rich) asteroids, which make up about 75% of known asteroids. Their results suggest these asteroids could serve as a valuable source of raw materials, offering potential for future resource exploitation.
The study was led by Dr. Josep M. Trigo-Rodríguez, a theoretical physicist at ICE and the Catalonian Institute of Space Studies (IEEC) in Barcelona. He welcomed PhD student Pau Grèbol-Tomàs (ICE and IEEC), Dr. Jordi Ibanez-Insa (Geosciences Barcelona), Prof. Jacinto Alonso-Azcárate (Universidad de Castilla-La Mancha), and Prof. Maria Gritsevich (University of Helsinki and Ural Federal University’s Institute of Physics and Technology).
Carbonaceous chondrites (C chondrites) frequently reach Earth, but scientists rarely recover them for study. Representing just 5% of all meteorites, their delicate structure often leads to fragmentation and loss. Researchers have discovered most of the recovered samples in desert areas, such as the Sahara and Antarctica.
ICE-CSIC Research and Analysis of Asteroid Samples
The Asteroids, Comets, and Meteorites research group at ICE-CSIC, led by Trigo-Rodríguez, studies the physicochemical properties of asteroids and comets and serves as the international repository for NASA’s Antarctic meteorite collection.
In this study, the team selected and characterized asteroid samples, which Professor Jacinto Alonso-Azcárate at the University of Castilla-La Mancha then analyzed using mass spectrometry.
This process revealed the precise chemical composition of the six most common C chondrite classes, offering crucial insights into the future feasibility of resource extraction, Trigo-Rodríguez stated in a CSIC press release.
Scientific Insights from Undifferentiated Asteroid Meteorites
The scientific value of these meteorites lies in their origin from small, undifferentiated asteroids, providing key insights into the chemical makeup and evolutionary history of their parent bodies.
At ICE-CSIC and IEEC, we focus on experiments that explore asteroid properties and how space-based physical processes shape their composition and mineralogy. This published work represents the culmination of our team’s efforts.
Understanding the material abundance in asteroids is crucial, as they are highly heterogeneous. While generally categorized as C-type (carbonaceous), M-type (metallic), or S-type (silicaceous), asteroids are also classified based on their spectral properties and orbital characteristics.
Asteroids are remnants from the formation of the Solar System and have been shaped by roughly 4.5 billion years of evolution. Understanding their exact composition is therefore key to identifying where resources like water and ores are likely to be found.
The team’s findings suggest that mining undifferentiated asteroids—thought to be the source of chondritic meteorites—is currently impractical. However, they identified asteroids rich in olivine and spinel bands as promising candidates for future mining.
They also highlighted that water-rich asteroids containing abundant water-bearing minerals should be prioritized. Meanwhile, they stress the importance of further sample-return missions to confirm the composition of these progenitor bodies before any mining efforts can proceed, Trigo-Rodríguez stated.
Developing Technologies for Resource Extraction in Microgravity
“Alongside advances in sample-return missions, there is a real need for companies that can drive the technological development required to extract and collect materials in low-gravity environments. The processing of these resources—and the management of resulting waste—will also have significant impacts that must be measured and carefully managed.”
They argue that achieving this will require large-scale collection systems and methods for resource extraction in microgravity.
“For some water-rich carbonaceous asteroids, harvesting water for reuse appears more feasible, either as fuel or as a key resource for exploring other worlds,” Trigo-Rodríguez added.
Understanding and Mitigating Potentially Hazardous Asteroids
“This research could also help science gain a deeper understanding of celestial bodies that might one day pose a threat to Earth. In the future, we might even be able to mine or reduce the size of potentially dangerous asteroids so they no longer pose a risk.” As Grèbol-Tomàs explained:
“Examining and selecting these types of meteorites in our clean room using various analytical methods is truly fascinating, especially because of the wide range of minerals and chemical elements they contain. Still, most asteroids have only small amounts of valuable elements, so our study mainly focuses on assessing how feasible their extraction could be.”
“It may seem like science fiction, but even the first sample return missions, planned thirty years ago, once sounded just as far-fetched.”
The Benefits of Asteroid Mining
Regardless, asteroid mining offers enormous benefits, which explains why interest in it has grown so much over the past decade. Beyond precious metals, many asteroids contain water ice that could be used to produce fuel for deep-space missions or provide drinking water and irrigation for crops.
This could lessen dependence on resupply missions from Earth, enabling both robotic and crewed missions to operate more independently. By moving mining and manufacturing activities to cislunar space and the Main Asteroid Belt, humanity could also minimize the environmental impact of these industries on our planet.
Renewed Research and Long-Term Prospects for Asteroid Mining
Although public excitement about asteroid mining has waned over the past ten years, numerous companies continue to research and develop the technologies needed for it. Likewise, space agencies such as NASA and JAXA have carried out sample-return missions, uncovering valuable insights into both the scientific significance and material potential of asteroids.
Soon, China’s Tianwen-2 mission will meet up with a near-Earth asteroid and a comet from the Main Asteroid Belt. While a full-fledged space resource industry could still be decades—or even longer—away, many are eager to stake their claim early.
Read the original article on: Sciencealert
Read more: Searching for Dark Matter Axions Using a Quantum-Enhanced Haloscope