Cerro Huiluco, Quimsa Cruz. Because of icy winds and snow during the “dry” Bolivian winter, traveling alone from mid June to early July, I was only able to make the second ascent of Chiar Huyo on July 2 and the first ascent of Cerro Huiluco on July 8. Chiar Huyo (5500 meters, 18,045 feet), north of Cerro Santa Rosa on the official military map, had a cairn built by mining surveyors. Huiluco (5200 meters, 17,061 feet) is the sharp, dark rock cone in the upper Atoroma valley, west of Cerro Yaipuri. I climbed the west face on good, steep rock and loose snow.