Cerain rare earths in the ALnthanides , are getting more and more desirable and, even though Smarium is more abundant than some metals (like tin), its in a slicate sand mix and requires beneficiation from mixes as low as 3 ppm.
Maybe some planets have a source more easily gotten.
China US, and Brazil are biggest reserves and China is the biggest mining entityy. I believe China will beat us back out into space for such mining and extraction bases.
Asteroids may have crystals with several rare earth lattice concentrations. We all mine about 700 tons per year and most all of it goes into filters and, more importantly, really strong magnets that are mush more resistant to demagnetization than neodymium ones