Found these two graphs in the article below. The premise is that GLD is over valued compared to miners and that GDX is overvalued compared to GDXJ. So either gold falls from here or will the miners, especially the juniors, play catch up soon.

                     

https://seekingalpha.com/article/4094311-will-gold-miners-coiled-spring-ever-released?li_source=LI&li_medium=liftigniter-widget