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Cal, I don't know much about caves, but the west is full of mines, many of the tunnels go back for thousands of feet, and they are dry and stay a constant temperature, I forget
if it is 68 degrees of 58 degrees year around.

I can think of one in the Yuma area that was mined before 1900, the tunnel is over 7,000 feet, this is according to
the Arizona mining records, no, can't remember the name, but we spent 3 days there.

The King of Arizona mine tunnel I have been in, I don't recall how far it had been dug, but it saw more than about
a half mile, as I was there with the owner Dr. Burdick of Yuma.

It was cool and dry.

But across the canyon, they hit water and it poured out of all the cracks in the mountain, once they broke thru the rock and released the underground water.

Law has asked the owners to put Iron doors on the mines and some have been there for a hundred years. If you can see
in, you will see the old equipment still there.

Arizona lost all but the largest copper mines during WW2, as the draft board said if your health allowed you to be a miner, then you were needed in the Army.

the equipment was sold for scrap metal to fight the war with and when the men did come home, there was never enough money to get started again.

I would look for anything to be stored in a mine shaft or tunnel.