Ted Spread Weekly
An important chart to watch in the event you don't have an inverted yield curve to go by is probably the TED Spread. This one has a meaningful moving averages crossover, where gold prices are still waiting for theirs on the weekly chart:
http://scharts.co/1q8R7zw
Fed Funds 30-day JUL 2014/FEB 2016 Spread
Another interesting futures spread, though the charting only goes back so far. Don't have the charting facility to overlay this one with gold prices, or other interest rates:
http://quotes.ino.com/charting/index.html?s=CBOT_ZQ.N15_G16.E&t=&a=&w=&v=dmax
Aug 2014/Dec 2019 Gold Price Spread
http://quotes.ino.com/charting/index.html?s=NYMEX_GC.q14_Z19.E&v=d12&t=l&a=0&w=1
-F6