Not mining it, per se, but rather bartering for it from friendly civilizations, etc.
I don’t have the Voyager tech manual, but the TNG one says the Galaxy class ships have an emergency converter that can convert deuterium to antimatter, though it’s quite inefficient and only really useful in emergencies. So I was guessing that Intrepid-class ships have a similar converter, and that it must be efficient enough for normal (re) fueling operations since we only ever see them seeking out deuterium.
Not mining it, per se, but rather bartering for it from friendly civilizations, etc.
I don’t have the Voyager tech manual, but the TNG one says the Galaxy class ships have an emergency converter that can convert deuterium to antimatter, though it’s quite inefficient and only really useful in emergencies. So I was guessing that Intrepid-class ships have a similar converter, and that it must be efficient enough for normal (re) fueling operations since we only ever see them seeking out deuterium.