You still have the option to tell the Ferryman about the mines despite moving

[Barry]

I contacted the Ferryman over the navcom about the LEMCO mines, told me to get there personally, then I told Aegis about the mines and had them moved because I negotiated safe passage for the laborers with the pirates. I finally go to the Ferryman but I get the option to tell him about the mines I had already gotten moved.

[PhrygianDominant]

Fixed for the next hotfix.