As you see here: http://discoverygc.com/forums/showthread.php?tid=19206
the Congress has been granted permission to ship goods into the Taus from Bretonia. It allows us to ship silver ore mined by the miners at Saltese to Planet Harris, where it can be sold for 15% more then on California. The trip has a risk though, as Tau-31 is controlled and patrolled by the Galic Royal Navy. It is a profitable trip if we ship silver ore to Tau-31, then we bring back MOX from LD-14 to fuel our bases.