I knew a man who discovered a few old mines with iron doors in the mountains near Cave Creek, AZ over 25 years ago. They were buried under rubble, and it would have cost over two million to excavate the rubble and build a road up the mountain.As it turned out, a woman owned the claims on several mountains nearby, and there were numerous waybills and stuff that indicated that the Spanish or Mexicans had done the mines and he thought it was the Lost Peralta mines that the Dutchman had gotten into, and had over 100 photos of all this.
So there it sits, and as far as I know, no one has touched the mines!