Geology of Colorado Creek (115J/10), Selwyn River (115J/9) & Prospector Mountain (115I/5) Map Areas, Western Dawson Range, West Central Yukon

The project area includes Colorado Creek (115J/10), Selwyn River (115J/9), and Prospector Mountain (115I/5). Most of the area is in the Dawson Range subdivision of the Yukon Plateau in west-central Yukon Territory. The oldest rocks in the region are metamorphosed Proterozoic to Paleozoic(?) sedimentary and igneous rocks of the Yukon Metamorphic Complex. They are intruded by batholiths and plutons of hornblende and (or) biotite granodiorite, monzonite, and quartz monzonite of three Mesozoic suites. The older two, which show penetrative metamorphic textures, are the Triassic(?) Klotassin Suite and the Jurassic(?) Big Creek Suite. The third is the unmetamorphosed Dawson Range Suite of Middle Cretaceous age. Slightly younger igneous units consist of felsic to intermediate volcanic and subvolcanic rocks of the Mount Nansen Suite. Early Tertiary igneous rocks include extrusive andesite, basalt, and minor rhyodacite of the Carmacks Suite, and the slightly younger monzonite to quartz monzonite of the Prospector Mountain Suite. The district contains numerous mineral deposits and occurrences of economic interest. Copper and molybdenum deposits are associated with felsic plutons of at least…

Publisher

Government of Yukon

Resources

3

Catalogue metadata updated

2026-08-26