The last eruption may have preceded 1600 by several centuries, based on the presence of volcanic ejecta buried under soil. Native people reportedly offered sacrifices to the mountain such as birds, personal clothing and sheep, although it is known that non-volcanic mountains were also offered sacrifices in southern Peru. There have been no eruptions since 1600; a report of an eruption in 1667 is unsubstantiated and unclear owing to the sparse historical information and probably reflects an eruption at Ubinas instead.