The last mining tech lets you specialize on resource extraction. It gives an extraction bonus specific to what you are mining.
It should provide bonus to either:
- Antimatter
- Durantium
- Elerium
However, antimatter will always show up, even if not present.
So I can have an antimatter extraction module that generates no bonus because it's sitting on a elerium and durantium mine.
In fact, I have to double check, I think only durantium and antimatter ever show up.