Hmmm ...could be point to start player's craftingAfter seeing the FC bubble->Colonia & Colonia-bubble shuttle trips dry up on the FCOC (Fleet Carrier Owners Club) discord channel, I've come to the conclusion that limiting the tritium supply to carriers via mining is a bad idea
Read about some actual theoretical studies being done about how to produce large amounts of tritium. The most promising approach seems to be by bombarding lithium pellets with radiation from a fusion reactor.
There has to be a way of incorporating this idea into the game by using lithium pellets as a limiting factor in how fast an FC can generate the tritium it needs for a long journey.
I'm assuming of course that the carriers have built-in fusion reactors. If not, then maybe a fusion based refinery module can be made available to FCs.