Tunnels, Cement and Wine.
I was digging on the tunnels in Cape Girardeau, Rush Limbaugh's home town. I wanted to know who owned the mines now, so I traced it to Buzzi Unicem company based in Italy. The President of Buzzi Unicem in America is Massimo Toso. Massimo Toso is also part of a wine family in Italy. Mossimo Toso's main office for Buzzi Unicem is headquartered in Indianapolis, Indiana. Notice (Green Castle) in the map? St Louis has been called the "Rome of the West", for a long time. Cape Girardeau has been a main supplier of cement since the 1700s. It sits on the Mississippi, down stream from St. Louis , the main method of transportation for a long time, Nashville is further down the river. There used to be a glass company in Cape Girardeau that operated the mines.
http://www.capecentralhigh.com/
https://www.archstl.org/history/modern-world
https://www.buzziunicem.com/en/united-states-of-america
https://www.internationalbeveragenetwork.com/51479/TOSO-SPA
https://www.worldcement.com/the-americas/09042020/coronavirus-company-updates-buzzi-unicem-usa/