And way more Tungsten than required.
Just ask the Germans (Gyrsur, are you around?) how long it took to take THEIR gold back to motherland.

EDIT:
Yes, tungsten filled Bullion is a real thing, even for expereinced traders: How A Manhattan Jeweler Wound Up With Gold Bars Filled With Tungsten


EDIT2:
Intreesting read on the topic: How Germany got its gold back