Fiax is a large terrestrial planet with a freezing surface and a thin nitrogen-based atmosphere. It presented the turians with the engineering challenge of mining its abundant heavy metals and getting them off the high-gravity planet without burning so much fuel or requiring so much eezo that it killed the profit margin. As a result, mining concerns here were heavily subsidized by the Hierarchy, in return for the government keeping large stores of gold, iridium and niobium for their strategic reserve.
A large Reaper force of capital ships and destroyers can be seen on sensors here, having chased off Fiax's defenders. Interestingly, they seem to have captured several of the orbital stations intact rather than turn them to slag.