I my earlier posts I've said about how Moon mining is to be done, or at least started off small scale to get materials for larger scale buildings. It's sort of a response to a NASA challenge over a decade ago for lunar oxygen extraction from regolith, mainly anorthite (CaAlSiO4x), or JPL-1 simulant. The process is calcium thermite with just about any silicate dust, then calcium oxide electrolysis in one of 3 ways: 1. room temperature Castner Kellner cell to get calcium amalgam, but the amalgam stripping side lithium ion battery solvents to get metallic calcium. 2. Rhenium (or Iridium is more abundant) anode molten calcium fluoride/oxide electrolysis with calcium cathode under vacuum relative to the normal vapor pressure of calcium. 3. the usual CaCl2 electrolysis with gradually raised cathodes (else the Ca metal dissolves back), then burning the Cl2 to HCl with hydrogen, then reacting the HCL with CaO to get water and CaCl2, and electrolyze the water. The metallic alumino-silicon slag that gets left behind from the thermite reaction has to be high temperature vacuum extracted for Mg, Na, K, then the remainder Si, Al, Fe, Ti needs to get chlorinated and distilled to separate out the individual elements, including ultrapure silicon for solar, aluminum for mirror, and iron and titanium for structural components.