Terrain: The Ha-Iltzuk is the largest icefield in the southern half of the Coast Mountains. It lies west of the Klinaklini River, west of the Waddington Range. The peaks tend to be quite a bit more straightforward than the peaks in the Monarch Icefield, immediately north of it.
Silverthrone and adjacent peaks are volcanoes; this is the next link in the Ring of Fire north of the Meager Group. The distance between Silverthrone and Meager is attributable to offshore tectonic plate dynamics.
Don Munday called Silverthrone "home of the snows". It has notoriously wet weather. This is why the Klinaklini Gl. descends to only about 300m above sea level. Take extensive rest day reading material if planning a traverse here.
History: The first mountaineering visit was by the famous pioneering climbing couple of Don and Phillis Munday in the 1930s who made the first ascent of Mount Silverthrone by walking up the Klinaklini Glacier from the head of Knight Inlet (CAJ 1936). The Mundays, of course, are best known for their discovery of Mount Waddington. The next visit was by John Clarke in 1973, who was dropped off via air at the north end, traversed south through the Tumult Range and exited at Sim Creek. (CAJ 1974). The area has been traversed several times since then. There is little developed technical climbing in the area. Most of the obvious challenges are not in the central, icefield portion, but rather on the lower granite spires which border the icecap to south and west.