I believe that the 30 year low in that index (the XAU) was something like 47.
You would think that the 47 would be a hard floor. The XAU is currently at 70 (after moving over 200 just a few months ago), dipping to 63 earlier today.
I was actually considering shifting assets to XAU for a hard rebound. I do currently have a small position at Profunds.