The word is that this is a copper mine.  If you look closely, there is a dump truck somewhere in the upper half of the pic, probably a white dot.  I am reminded of the Charlize Theron movie about the woman who drove heavy machinery in a mining community and the hazards therein.  A killer hill awaited me after this photo opp.  We all have different climbing speeds, mine being slow.  My average speed of 9mph for the entire day yesterday was boosted by a couple of hair raising speedy downhills.  I am amazed at some of my colleagues who seem to fly up these steep inclines.