Nuevo Mundo represents the youngest activity from the vast Frailes plateau, and as such may represent the waning stages of the last caldera cycle or the initiation of a new cycle.
Nuevo Mundo, which with a basal elevation of 5,100 m forms the highest points on the Frailes plateau, consists of two small dacitic coulées overlain by ash and pumice cones. Emplacement of the coulées, which were erupted along a N-S trending fault and overlie moraines in the northwest, was associated with minor block and ash flows to the east. No other evidence for early explosive activity has yet been found. Sometime after the coulée eruptions, a plinian pyroclastic eruption with a dominantly easterly distribution took place. Accumulation of dense clasts occurs proximally in the form of two half cones and several ash dunes on top of the coulées. Young ash still blankets much of the countryside between Nuevo Mundo and Potosi - a distance of ~200 km, however no records of the eruption are known and it must pre-date the Spanish colonisation in 1533. Nuevo Mundo is considered to be of late Pleistocene or Holocene age.
de Silva, S.L., and Francis, P.W., 1991. Volcanoes of the Central Andes. Berlin: Springer-Verlag, 216 p.