Sillajhuay
| Sillajhuay | |
|---|---|
| Alto Toroni, Sillajguay | |
Sillajhuay seen from the west | |
| Highest point | |
| Elevation | 5,982 m (19,626 ft) |
| Prominence | 1,733 m (5,686 ft) |
| Parent peak | Nevado Sajama |
| Listing | Ultra, |
| Coordinates | 19°44′32″S 68°41′26″W / 19.74222°S 68.69056°W |
| Geography | |
| Location | Bolivia–Chile border;Oruro, Arica y Parinacota |
| Parent range | Andes |
| Geology | |
| Rock age | Pliocene-recent |
| Mountain type | Volcano |
| Volcanic arc/belt | Central Volcanic Zone |
| Climbing | |
| First ascent | pre columbian but first recorded ascent 1926 - Friedrich Adolf Ernest Ahlfeld (Germany) |
Sillajhuay (also known as Sillajguay or Alto Toroni) is a volcano on the border between Bolivia and Chile. It is part of a volcanic chain that stretches across the border between Bolivia and Chile and forms a mountain massif that is in part covered by ice; whether this ice should be considered a glacier is debatable but it has been retreating in recent decades.
The volcano has developed on top of older ignimbrites. The volcano was active within the last one million years, but not within recent times considering the heavy glacial erosion of the mountain and the widespread periglacial modifications. Non-eruptive activity however occurs in the form of surface deformation and earthquake activity.