Part of a guided tour of the Salar de Uyuni and Lipez in Bolivia : our truck driver took us almost to 5400 m level on an old sulphur-mining road. (Uturuncu is a volcano) Hiked up from there. Cold and windy at summit. GPS reading (6068 m) was higher than nominal 6008 m . Found a geo-cache near the summit. Corrected date is April 17, 2016 (typo in my original report)