South face of Rasac, July 2010
|Elevation||6,017 m (19,741 ft)|
|Easiest route||glacier/snow/ice climb|
Rasac (hispanicized spelling) or Rasaq (Quechua for toad) is a mountain of the Waywash mountain range in west central Peru, part of the Andes. It has a summit elevation of 6,017 metres (19,741 ft) (other sources: 6,040 m/19,816 ft) high. Rasac is a long, relatively squat mountain on the western edge of the Waywash range, across the glacier from the tallest peak in the range, Yerupaja. Although it´s a 6,000 metre mountain, Rasac´s broad profile is dwarfed by Yerupaja.
As the rest of the Waywash, Rasac is made mainly of limestone, interbedded with sandstone and shale. These sediments were originally laid down on the ocean floor and have been pushed up and folded due to the convergence started about 90 million years ago when the Nazca oceanic plate started to slide under the South American continental plate. The limestone has a coarse, sharp texture and is light to dark grey in colour (although sometimes a slight bluish tint can occur). Marine fossils (bivalves and ammonites) may be found within some of the limestone beds. Some volcanic activity has also influenced the geology of the Huayhuash.
Rasac is considered to be the easiest 6,000–metre peak in the Waywash range, but it is still a challenging climb. The long, snowy West Face is divided by a series of buttresses, most of which have routes in the D range according to the International French Adjectival System. The Right Buttress is still unclimbed. The East Face is almost all rock, most of which seems in the condition not to be climbed. There is allegedly a snow route of moderate difficulty (considered to be the normal route and rated around AD) up a gulley on this face that looked in the summer of 2007 to be totally out of condition.
Even if Rasac is overall the most climbed peak of the Waywash range, it remains a mountain climbed very rarely (less than a climb per year). The mountain lies in a remote and wild setting. Expeditions willing to climb in this area have to be fully self-sufficient in case of an accident or emergency.
- Page 83 of John Biggar - The Andes - A guide for Climbers (2nd edition) - Andes - 1999
- "Geology of Cordillera Huayhuash". Andeanexlorer.com. Retrieved 2012-03-17.
- Pages 107-108 and 173 of Jeremy Frimer - Climbs and Treks in the Cordillera Huayhuash of Peru - Elaho Publishing Corporation, Squamish BC - 2005