Thanks guys!
I'm not sure what it is tgates? Some metal vent type contraption left over from an old mining operation.
JonK...thanks! That's a huge compliment and means a lot!
JM, yep it's on the ground. I got inside of it and tried to get some more sky, but you kinda lose the perspective from inside. I can't say for sure, but I'm guessing it weighs a few hundred pounds. It's about 15 ft long and 6 ft high and the large end, then it tapers down to a small opening.