Looks like that chart doesn't contain information from the 80's. I found this chart where the 1980 price level and crash seems to be pretty significant: https://www.researchgate.net/figure/Historical-rhenium-metal...
https://en.m.wikipedia.org/wiki/Silver_Thursday
Different metals are correlated too. There are charts at the end of
https://www.hwwi.org/fileadmin/hwwi/Publikationen/Research/P...