You might be interested in my answer to a similar question two weeks ago here.

As for gold in particular, not very much. Vikings did not really have an exchange system for gold to the extent that they had it for silver. Gold finds from the Viking age are pretty rare, especially in comparison with silver, and they did not actually loot much gold from either their western or their eastern travels. It is probable that most gold in circulation in 8th-11th century Scandinavia was simply inherited material from previous centuries, locked up (economically) in the jewelry and prestigious items of the super-rich. Gilding, on the other hand, was fairly common, even for relatively lower-class items. It is probable that a significant part of the gold that was in circulation in the Viking age was actually found in the ground in Scandinavia itself, as rediscovered depositions of sacrifices made in the Late Roman and Migration periods, a few centuries earlier. This is why Vikings had lots of legends about buried treasures, and also why in the early medieval period some of the earliest laws we have specify that any gold that is found in the ground belongs automatically to the king, not to either the owner of the land or the finder. This law is still in effect in both Sweden and Denmark (Danefæ). The supply of this buried silver would be particularly abundant during the Viking age, because in this period settlement zones expanded into previously unploughed areas, rooting up soils that had been previously undisturbed.

As for the economic routes of the gold after it had been brought into circulation, it pretty much always flowed from the king as gifts to loyal followers, but not much further than that. This meant gold always had an association with loyalty to the king (after all, it could only come from him) and could not simply be traded away (because if you possess gold and are not a 'friend of the king', you have to give the gold back). So gold basically remained in circulation within a clique of people at the very top of the Viking social hierarchy, completely detached from a more widespread silver economy.