Thanks for the response.
I have a few other former Hittite parts which I have been unable to locate the bonding wire. It is most likely that they are all gold, however I would like to verify that. The parts are HMC245AQS16, HMC245AQS16E, HMC361S8G, HMC413QS16G, HMC474SC70, HMC604LP3 and HMC716LP3.
All listed amplifier parts have gold wires.