[algo_trader]

Incredibly, we mine a lot more than a billionth of a billionth of earth mass !!

Earth ~6x10^24kg, annual human resource extraction is ~10^14kg.

(Could my figures be wrong? Its bizarre!)

[TakeBlaster16]

Mining on earth has the handy benefit of not requiring huge amounts of energy to send payloads through space

[Teever]

The idea is to develop a a self-sufficient industry on the moon so that you can do in-situ production of the manufacturing capacity and have it highly automated or teleoperated from Earth to minimize the number of people travelling to and from.

If it's done right you can produce pretty much everything except for semiconductors directly on the moon.