Tseax Cone

Tseax Cone
Tseax Cone in September 2013
Highest point
Elevation	610 m (2,000 ft)
Coordinates	55°06′39″N 128°53′56″W / 55.11083°N 128.89889°W / 55.11083; -128.89889
Geography
Location	British Columbia, Canada
Parent range	Nass Ranges
Topo map	NTS 103J/2
Geology
Age of rock	Historical
Mountain type	Cinder cone
Volcanic arc/belt	Northern Cordilleran Volcanic Province
Last eruption	1690 ± 150 years (15th deadliest eruption of all time)
Climbing
Easiest route	drive

The Tseax Cone (/ˈsiːæks/ SEE-aks), also called the Tseax River Cone or the Aiyansh Volcano, is a young cinder cone and adjacent lava flows associated with the Nass Ranges and the Northern Cordilleran Volcanic Province. It is located east of Crater Creek at outlet of Melita Lake, southeast of Gitlakdamix and 60 kilometres (37 mi) north of Terrace, British Columbia, Canada.

The volcano is in a valley above and east of the Tseax River, about 20 kilometres (12 mi) south of the river's junction with the larger Nass River. The Tseax Cone is one of the most accessible volcanic centres in British Columbia.

The Tseax Cone is in the southern part of the Northern Cordilleran Volcanic Province and is therefore part of the Ring of Fire. It has been the site of some of the youngest volcanic eruptions in Canada. It has been active at least twice in the past few hundred years and other remnants of lava flows exist in the area. It is 290 m (951 ft) in diameter at its base and rests on the remnants of an earlier and somewhat larger, dissected, 460 m (1,509 ft) diameter cone. The volcano is made of volcanic bombs and cinders with a crater at its summit where a churning lava lake poured and overflowed its rim during the 18th century.