I've spent a few days doing gold runs in the system with Freeport and it paid great dividends.
I would say though its pure luck whether you get a bunch of cannisters, and then more luck for it to be gold. More often than not its Explosives or Cobalt.
The feeling though when you do drop and there are 7 gold cannisters, and you know there is every possibility you have about 30 seconds to collect as many as possible before heat shows up, is pretty exciting. I spent the time constantly switching radar spread so I could better gauge nearest cannister, plus getting best heads up if enemies spawn.
Probably got myself about 200k from the gold (in a Viper), over a few hours for 3 days. Your results may vary.