Maybe-and 100 years from now sea levels are predicted to be higher so better mine lower portions now lol- lowest part of mine ca 77 meters above sea level (not debating the cause of sea level rise-a hot topic and the earth often has built in compensating cyclical macro mechanisms) w some island nations being buried by the sea-just as the island in my comedic post pic used to be larger-they say if greenland ice sheet melts that would raise ocean levels 22 feet alone.

I've seen abandoned mines-Butte copper mine is a famous example-fill w lakes by themselves from groundwater but not usually in a desert-butte copper mines arsenic water would kill a tic. 

Average oil drill depth in U.S. ca 5-6000 feet and I'm aware of oil/gas drill holes 20,000 feet deep -(and w special tech drill in ocean anyway)-oil wells in Long Beach CA close to ocean but they are encased-just dont know enough about it as u can tell from my rambling-but iron?