I was way too generous on that estimation of elevation for Thacker Pass:

"Thacker Pass Information

Coordinates: 41.6998969°N, -118.0729281°W
Approx. Elevation: 4,938 feet (1,505 meters)
USGS Topo Map Quad: Thacker Pass"

I live at about 4,500 feet elevation.. as does most of Reno and Sparks, Nevada.. so working up at Thacker Pass would not begin to put the strain on the respiratory system that workers endure every day that they are up at Cauchari-Olaroz.     Okiedo