Who explorers caves or tunnels exposed during boring?

I think you should call the U.S.G.S.( United States Geological Survey ) first.

Figured THEY did, but wondered when a Highway Contractor, or Non USGS business, stumbles on a tunnel, are they forbid to explore, or do they automatically notify the Geological Survey?
And then say it is High Grade Gold vein worth Zillions, Does the discoverer get a percentage?

GOOD LUCK! Who owns the construction company? Who is the landowner? I suggest filling your pockets.

I wish, Its just whenever I see them, I believe there is a high probably of running into one an old cave or tunnel system.
I used to explore Caves and old Mines as a kid in Southern Nevada. I would love a job spending Days or longer in remote areas searching for Outcrops, Lost Caves, Ancient Sites. I still do it for fun in my spare time, would be nice full time and get paid.

I know. I got into climbing and rappelling when I was doing high rise building structural analysis, rappelling down elevator shafts getting measurements. And going down the outside of the buildings with mirror glass was way cool. 25 stories was as high as I got, in downtown Atlanta seeing the reflection of yourself with the city behind you was a huge rush! Anyway the guy who taught me was from Arizona. We got into exploring caves(spelunking)in north Georgia. Not for everyone for sure. Nothing real radical, maybe 60-75 foot drops.We thought we were the first to get there until we found batteries and rolling papers at the bottom. Good luck on the treasure hunts, northern Georgia still has, according to the experts, 90% of it's gold veins. The gold rush in California attracted most of the miners away. Look into it.Georgia's gold is supposed to be really high grade.

Do you have Thomas Terrys Treasure Atlas's, If not, let me know the area you are located(with in 50 miles), I'll give you some locations. Lost Gold, Caves, Minerals, Old Trails, Stage Lines, Very Interesting.