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Gold drops in different places depending on map, and in nearly every map there is at least one drop point in the center.

So when the mark appears, just drive around for ~15 seconds, then, if you didn't find the spot, try to go on a high place.
Like that, even if you didn't find the drop zone, you will see it fall.
When you see it, rush to the point (don't be afraid to use nitro), and fight your way to it.

If you did find the spot: try to get an advantage of other tankers to catch the gold easier: try to find a high point just above the mark, so you just fall on it when it drops.

But be careful: golds located under a bridge or floor will appear instantly on the ground: try to stay on the mark and under every one: titan helps a lot for that.
That's it!
Upvote if it helped

Happy gold catching,