Recent Lunar Space Elevator Study for NASA’s NIAC by Jerome Pearson: Lunar Space Elevator
Once the refueling base is established, the next step is the Lunar Space Elevator. Existing materials can’t hoist mass from Earth to Geosynchronous Orbit, but they can lift mass from the Moon to either Lagrange 1 or 2. This would revolutionise the refueling economics, making the Moon the Staging Post for the rest of the Solar System. A solar powered crawler could carry propellant tanks up from the Moon to load waiting space vehicles.
Pearson’s company is here: Star Technology and Research
As well as propellant, the Moon could ultimately supply materials for interplanetary spacecraft. But where will the materials for the Elevator comes from? Does it have to come from Earth? Refueling in Lagrange Part 3