I dont think metals are in a bubble however if all you did was look at this chart you would probably suspect otherwise.
Try looking at charts that show the amount of currency created over the same period, and population growth.
Looked at the above, thought that something was suspect, then I realised that it's a Log scale... Made me feel smart and stupid at the same time.
That chart doesn't make sense In 1980 gold peaked around $800 yet that chart shows it peaking at $2000 Do you have the basis of the numbers being used ?
A little bird told me the magic number is $1377 Whilst I like birds I don't think magic is an exact science