https://www.youtube.com/watch?v=w5g1PE6QhKM

Discussion of the miners and the inflation-adjusted gold price begins at 9:35.

This at least is one rational explanation for why the miners have done so poorly relative to metal since 1980: gold has surprisingly not yet exceeded its inflation-adjusted high from 1980 (but it is on the brink of doing so now after 40 years!).