Is it possible to create something like, higher tier radars that reveal "deep" ore which can't be detected from the surface? So not only is the ore invisible, it is truly undetectable. ATM invisible ores can be detected by dragging a miner around.

It would be pretty neat to have late-game ores. You build out your factory only to discover your built it on something terribly valuable!

That's really a larger separate mod concept. This mod was just a simple one made ages back for maps with excess ore on them, i.e. dangOREus.