I have a world which has a high iron content in its core, like a more extreme version of Mercury, geologically speaking. The system only has this world and a tidally locked hot Jovian (of which the main world in question is a moon), which also has another couple small moons. I might have other planets join them, but they aren't going to be for anything but fluff, so it's a low priority. The idea is that the Jovian happened to capture the iron world (unlikely, but the sun has a low mass, so a close flyby might have gotten lucky, and it's unimportant anyway).
For this world, I did some cursory reading and it seems like what would be more common here are siderophilic elements, which would be platinum group metals, cobalt, iridium, etc. That sounds fun, and provides a nice economic niche for the planet--cobalt for lithium ion batteries, the naturally occurring superconductor covellite, etc. But, and here's my issue, I'm not sure if that's accurate. Would such a world with a high iron-content core have more availability of these more rare elements?
Endstate: I would like for this planet to have an economic reason to have been taken over, since in this setting "planet cracking" is a thing one nation is described to do (well, we can split hairs about ecological stewardship extending to the stability of star systems, but that bit wasn't up to me lol). In the face of that it's questionable why anyone would bother doing conventional mining unless there's a good wrinkle, and I think what I have would be a good one, if it makes sense.