"Zinc Dimes, Tungsten Gold & Lost Interest" by Jim Willie, CB, FSU Editorial xx/xx/2009
In October, the Hong Kong bankers discovered some gold bars shipped from the United States were actually tungsten with gold plating.
The initial discovery was something like four gold bars, which the Hong Kong bankers drilled invasively to test the contents. Reminds me of drilling the earth and measuring how many grams of gold per tonne. The HK bankers hoped to have 99% gold yield in their drill program for the resident bars. They found something like 1% instead and 99% tungsten.
Current estimates among the gold trader community run well past a few hundred thousand 'salted' gold bars, maybe over a million.