I am researching the abundances of rare earth elements and rare metals in meteorite samples, because I want to investigate the notion that asteroids represent abundant stocks of rare resources. The literature on space resources speaks volumes about platinum group metals, but little about anything else, so I did my own homework. Unfortunately I have no background in mineralogy, and I cannot find data on the actual abundances (in ppm, percent, or micrograms/gram and so on) of REEs/rare metals in meteorite samples. I figure this is an appropriate place for this question, sorry if I'm wrong.
My understanding is that the abundances of non-volatile elements in CI chondrites represents the primordial abundances at the formation of the Solar system. Therefore, the REE+rare metal content of other types of meteorite, and thus asteroid rock, is generally given by comparison to the CI chondrites -- ie, how much more or less enriched they are.
The problem for me is that the CI abundances seem to be nowhere specified in ppm or any measure relevant to mining, so I have no idea how useful any of these rocks could be for evaluating asteroid ore viability. The literature on economically viable ore grades seems to specify quantities of rare elements between 0.1% and 10% per unit mass, for commercial mining. So what are the abundances of rare elements in different meteorite types in ppm/percent?