Any launch from the moon would require launch back from earth to retrieve the rocket so it can be put to use again.

Space elevator and orbit launch is an interesting thought. I think it’s a tough sell. In that case we would be launching uncontrolled asteroid-like dumps towards the earth. Sounds like a nightmare waiting to happen. Every city would need a missile defense system 🤣. The resource dumps would have to be big enough to warrant the investment in the space elevator and not burn up in Earth’s atmosphere, or, we would need a space elevator on earth too (which would be the biggest engineering and political feat humans have ever done).

Mass driver. That’s another cool idea. From some research it looks like most metals have a temperature which they stop being magnetic and getting into Earth’s atmosphere would put most metals past that. Having a mass driver on top of a space elevator, or just a giant mass driver, also sounds like a head scratcher if most resources we would want can’t be ‘slowed down’

The problem with all these cool engineering ideas is that they seem to require a united human race. The universal earthling concept is probably lifetimes away or until we face some (un)natural disaster that causes countries to unify. With the way the world is right now, I am having a hard time imagining uniting for ‘progress’.

But then we need to get the resources back to earth… probably multiple launches per week.