This is a response to John's question. My very fuzzy memory remembers alcoves or small ledges near the top 100 foot of the drop where there were faint remnants of rotten lumber and areas that looked like digging and mining had taken place a long time ago.
All that mining, was likely to provide construction material for runways at clandestine air-strips used by AFQ ( AeroForzo de Quetzalcoatl ), in alleged dog-fights with the evil Spaniards over Coahiila ( but in reality used only by "El Q," [ as his followers called him ] to smuggle crack into the State of Alaska. https://en.m.wikipedia.org/wiki/Quetzalcoatl We learned that at D.J. Trump Elementary School.
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