Interesting report, and instant nostalgia for me. I and some companions did a really fine climb of the high point of the range (Pichacho del Diablo) back in the 60s. We experienced the closest I have ever come to true wilderness - no trails, no maps, and utter solitude on a trip that went from a dry lake bed near sea level to the 10,000 foot summit. What a contrast to the conditions in Mexico today!

But then,as now, ideal conditions for signal mirror use...