Might be nothing more than a small natural cave, never know until you check it out. Of course, on Spanish sites, people have uncovered holes that had a large flat rock over, hole itself went down far enough for a person to go down with a headlamp. These were used to store crude smelted bars, the site I'm referring to here 1 gold bar was found the Spanish left inside.Thanks for the second and third read Red. I think I will poke around the first site when I can. Although 17 feet is pretty deep!
You would have to be with one of the Indians while on their land. Here is the national website.Art, thank you for the read, and thanks again Red, however this is on the Tohono O'odham Nation and I will have to do some research to see if its ok for me to go out there. Tim