How to Mine the Moon: The ISRU Process

Overview

In 2026, the strategy for space exploration shifted from 'Backpacking' (bringing everything with you) to 'Homesteading' (living off the land). This is ISRU: In-Situ Resource Utilization.

The goal is simple but difficult: harvest the billions of tons of ancient water ice frozen in the shadows of the Lunar South Pole and crack it into Hydrogen and Oxygen, decoupling humanity from Earth's gravity well.

1. The Harvest (Excavation)

Mining on Earth is heavy; mining on the Moon must be light. Operations target 'Permanently Shadowed Regions' (PSRs) at -230°C. Autonomous rovers use percussive drills to break the concrete-hard regolith, anchoring themselves to fight the low gravity.

2. The Refinery (Sublimation & Splitting)

The frozen soil is dumped into a 'Thermal Wader' heated to 150°C. In the vacuum, ice flashes directly to vapor (sublimation), leaving the dust behind. This clean vapor is then electrified (electrolysis) to split it into Hydrogen (fuel) and Oxygen (oxidizer).

3. The Gas Station (Liquefaction)

The gases are cooled to cryogenic temperatures (-253°C for Hydrogen) using massive radiators to dump heat into space. The result is a 'Depot' in orbit, allowing starships to refill their tanks and carry heavier payloads to Mars.

Conclusion

ISRU is the distinct technology that separates a 'Flag and Footprints' mission from a civilization.

If we can mine the Moon, we can refuel the solar system.