To date, relatively few actual _mineral_ resources have been exhaustd. Cryolite was also a bit of a surprise for me, though I think I've run across mention of it before.

The more general trend, that it's been ecosystem resources, especially animal and plant extinctions, sometimes localized, which are more comonly encountered, suggests the risks we're facing are more likely systemic than strictly one of stocks.

I disagree with the general suggestion of your Slate reference that resource consumption is no longer a concern. Though economists specifically are rather divorced from reality.