This doesn't seem to be complete. It's missing the Waste Isolation Pilot Plant, for example, which should be southeast of Carlsbad, NM. It's a underground salt (metal/non-metal) mine, and MSHA definitely regulates it

The state numbers don’t seem to marry up, unless they’re indicative of something else?

WIPP isn't really a mine, right? More like an Amazon warehouse.

as far as MSHA is concerned it is. They take salt out of the ground to make room for the waste.