I looked at mines in Missouri and the issue is high ground water. The best solution would be the lead mines, they have huge chambers that would allow for large buildings. The fact that most of the pit mines filled with water and all the underground ones did shows just how bad an issue this would be. It would require Prime base to be completely watertight, well forever.
http://dnr.mo.gov/geology/lrp/surfac...ace-mining.htm
http://www.bonneterremine.com/
https://mostateparks.com/park/missou...-historic-site
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Originally Posted by .45cultist
For a Missouri Prime Base could be hidden by reclaiming one or more of the old coal strip pits. Perhaps by making one part under an underground storage rental, one a resort for fishing and hunting, not sure about the third. A couple have been turned into deep lakes, but other wise become brush filled scars.
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