If the Tseax Cone were to erupt, its effects would be felt throughout the interior of British Columbia. There may be a repeat of the poisonous gas disaster that happened to the Nisga'a people during the last eruption. If the lava flows are voluminous enough, they could spark forest fires and dam local rivers, crippling the local ecosystem. This would have disastrous short-term consequences for the important salmon fisheries found along the Nass River system.