An experiment aboard the International Space Station has demonstrated that common fungi can extract valuable metals from rock in microgravity—a biological breakthrough that could make asteroid mining economically viable.
According to Sci.News, researchers exposed fungal species to simulated asteroid material in the ISS's unique environment, discovering that the organisms successfully leached rare earth elements and other metals from the rock substrate using biochemical processes.
The implications extend far beyond laboratory curiosity. Asteroid mining has long been touted as the future of resource extraction, with near-Earth asteroids containing trillions of dollars worth of platinum, gold, rare earth elements, and industrial metals. But the economics have always stumbled on a fundamental problem: how do you process ore in space without shipping massive industrial equipment from Earth?
Enter biomining—using microorganisms to do the work. On Earth, bacteria and fungi already extract metals from low-grade ores through biomining operations, particularly in copper and gold mining. The microbes secrete organic acids and other compounds that dissolve metals from rock, which can then be collected and refined. The process requires minimal infrastructure compared to conventional smelting.
In space exploration, as across technological frontiers, engineering constraints meet human ambition—and occasionally, we achieve the impossible. Using fungi as microscopic miners definitely counts as creative problem-solving.
The ISS experiment tested several fungal strains' ability to survive and function in microgravity while exposed to basaltic rock similar to asteroid composition. The results proved promising: the fungi not only survived but actively metabolized, producing organic acids that leached metals into solution. The efficiency varied by species and environmental conditions, but the fundamental process worked.
This matters because launching mass to orbit costs thousands of dollars per kilogram. Sending heavy mining and refining equipment to an asteroid would require enormous capital investment, making most mining scenarios economically questionable. But fungi? You could launch a small bioreactor containing dormant spores, wake them up at the asteroid, and let biology do the heavy lifting.
The process envisions establishing a bioreactor facility on an asteroid surface or in a captured asteroid fragment. Crushed asteroid material would be mixed with fungal cultures in a controlled environment. The fungi would leach metals over weeks or months—slow by industrial standards, but speed matters less when you're not paying workers or operating costs. The metal-rich solution would then undergo relatively simple chemical processing to recover pure elements.
