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It would definitely be beneficial for AC, but electricity is still more expensive in Missouri than a place like Washington state or Montana. You might be better off in a colder climate with cheaper electricity.

Given its central location in the middle of the country, you may have benefits for having low-ish average latency from both coasts, but I'm not sure how close the mine is to any long haul internet backbone.

I suspect that to get to the coasts you'll route through either Chicago or Dallas... neither seems ideal.

Bluebird Network has a datacenter in the Springfield Underground: https://bluebirdnetwork.com/data-center-services/

In the video he mentions that one of the uses is for datacenters.

In general, they use hydro, but it is all over the map. Some are geothermal powered.