Perth Mint sold diluted gold to China, got caught, and tried to cover it up
The $9 billion dirty secret of an Australian gold icon
In a bid to save money, the world's largest processor of newly mined gold started "doping" its bullion. Then its customers started asking questions.

The historic Perth Mint is facing a potential $9 billion recall of gold bars after selling diluted or "doped" bullion to China and then covering it up, according to a leaked internal report.
Hmmm... I'll have to don my scuba gear and see if there are any Perth Mint bars in my stash that is at the bottom of the lake due to that tragic boating accident.