No, not any underground mines in San Antonio - We are on top of old limestone here, and all quarries are open pit.
Fiesta Texas, for example, is built inside an old gravel pit.
This sounds like the opening for a good story.
Actually a limestone quarry. So is "The Quarry" shopping center off 281, and Trinity University also on 281. Trinity is built on several levels of the old quarry. It's a long climb from the parking lot/athletic field level, to the Dorm level and up to the classroom buildings level. My daughter went to a preview day there, before settling on another school, the one where my wife is now a department chair. Good choice, IMO, but Trinity is still a pretty good school.