https://en.wikipedia.org/wiki/Refining_(metallurgy) https://en.wikipedia.org/wiki/Refining_(metallurgy) >The repeated application of such fire-refining process

https://en.wikipedia.org/wiki/Refining_(metallurgy) https://en.wikipedia.org/wiki/Refining_(metallurgy) >The repeated application of such fire-refining processes was capable of producing copper that was 99.25% pure. Copper and iron can be refined reasonably enough using heat. Maybe it's possible to "pitch" metallic ore into very close and highly a eccentric orbit around the sun to help melt it down before "catching" it on the other side. Perhaps acids could be brought up and recycled? https://www.space.com/13247-moon-map-lunar-titanium.html https://www.space.com/13247-moon-map-lunar-titanium.html Titanium might be more difficult. https://titaniumprocessingcenter.com/titanium-extraction-and-refining/ https://titaniumprocessingcenter.com/titanium-extraction-and... Seems like asteroid mining would be pretty straight forward on the surface of the moon. The lack of erosion is capable of showing us exactly where they are. Like I said it might take a hundred years before we can be totally self sufficient on the moon, but I think it's possible long term.