Many ‘banks’ got taken by the gold-plated zinc ‘bars’.
Many of the world bankers are so used to living large that they have raided the kitty way too many times.
It has gone on in the U.S. and around the world. Robbery on an international basis, and by the very people we entrust with our money.
Add to that, the government forcing banks to lend to bad risks. Now, we have to pay the bill. The bank bailouts are how we pay the bill.
Not possible, zinc is much less dense than gold. You are probably thinking of tungsten.