Oh I see, you mean the entity types. Instead of just using a mining-drill with a large radius, I went with this so I could target specific resources, and there's potential to have a remote search area too - if I decide to add that.
The only way to have a miner target a specific resource is if you modify every single ore and put it in its own category - and then provide a way to have the miners switch categories. At least that I know of. Perchance there is another, simple way, then I would probably just make it a mining-drill type entity, unless I decide I do want to pursue remote targeting afterall.