Seattle-based Interlune, a company focused on developing lunar mining equipment, has achieved a significant breakthrough in preparing for its ambitious Helium-3 harvesting operations on the Moon. The company has announced the successful development of a method to create a regolith simulant that accurately replicates the presence and behavior of solar wind-implanted volatiles, a crucial step in validating their Moon excavator technology.

The core challenge for Interlune and other lunar resource utilization efforts has been the lack of Earth-based materials that precisely mimic lunar regolith’s composition, particularly its enrichment with helium and hydrogen. While existing simulants approximate mineralogy and particle size, they fail to capture the effects of billions of years of solar wind bombardment, which is the primary source of valuable isotopes like Helium-3 on the Moon.

Interlune’s innovative solution involves a specialized vacuum chamber. Here, the company ionizes and accelerates helium gas, directly implanting it into ilmenite, a mineral believed to be a key Helium-3 carrier in lunar soil. This process effectively recreates the conditions under which helium becomes trapped within the lunar regolith.

Crucially, Interlune has demonstrated that the implanted helium behaves as expected when subjected to lunar conditions. By heating the helium-rich ilmenite, they observed the isotope’s release at temperatures consistent with those found in lunar surface samples collected during the Apollo missions, ranging from 300 to 800 degrees Celsius (572 to 1,472 degrees Fahrenheit). This validation is vital for engineers, assuring them that their Harvesting System’s performance tests will closely mirror actual lunar operations.

The company is also advancing its harvesting methodology. Rather than relying on heating the regolith to extract Helium-3, Interlune is pursuing a more mechanically driven approach, which is projected to require up to ten times less power. This efficiency gain is paramount for sustainable lunar operations.

With this new capability, Interlune can now produce its advanced gas-bearing simulant in quantities from grams to kilograms. This will significantly accelerate the development and testing of their lunar excavator. The company intends to make this unique regolith simulant, described as the first to faithfully replicate solar-wind implantation effects, commercially available.

Looking ahead, Interlune is exploring the inclusion of hydrogen implantation into their simulant process and investigating other minerals for helium capture. While the timeline for deploying the actual lunar excavator remains uncertain, the company has secured substantial interest and commitments. Contracts with entities like the U.S. Department of Energy, Maybell Quantum, Bluefors, the National Science Foundation, and the Texas Space Commission collectively represent $500 million in potential value.

Despite these significant advancements and commercial interest, the prospect of delivering Helium-3 from the Moon as early as next year, as some agreements might suggest, appears ambitious given the current stage of development. Nevertheless, Interlune’s groundbreaking work on simulant technology marks a pivotal moment in the quest for lunar resource extraction.