The explosive nature of past eruptions at Silverthrone Caldera suggests that this volcano poses a significant long-distance threat to communities across Canada. A large explosive eruption can produce large amounts of ash that could significantly affect communities across Canada. Ash columns could rise to several hundred meters above the volcano which would make this a hazard for air traffic along the coastal airway between Vancouver and Alaska. Volcanic ash reduces visibility and can cause jet engine failure as well as damage to other aircraft systems. In addition, pyroclastic fall could also have a deleterious effect on the Ha-Iltzuk Icefield surrounding the volcano. Melting of glacial ice could cause lahars or debris flows. This in turn could endanger water supplies on the Machmell River and other local water sources.