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Dang it Jim I wasn't going to start crowing but yes Beth and I did find a very old mine which is rich in gold, and it has a
natural arch right in sight of the mine. There are what looks like old foundations of a two-room stone cabin or shelter also in sight of the mine. That said, it does have gold but it isn't THAT rich so that a guy would get rich quick, and there is no evidence of any adobe building. So it may not be "the" Arch mine. Even so, you would not believe how many people have asked for the exact coordinates, so anyone reading this who may be thinking of asking, don't ask!
There is gold in those hills, a careful searcher might just get lucky and find the mine!
Good luck and good hunting amigos, I hope you find the treasures that you seek.
Roy