Geology, Mount Nansen - Nisling River area, Yukon

The Mount Nansen–Nisling River area is underlain dominantly by Paleozoic rocks of Yukon Tanana terrane, and Triassic to Paleogene successor rocks. Rocks to the east are dominated by the Mississippian Simpson Range suite that is intruded by the voluminous Early Jurassic Long Lakes suite. The western geology is dominated by metasedimentary rocks of the Snowcap assemblage and Stevenson Ridge schist, and lesser Finlayson assemblage metavolcanic and metasedimetary rocks. Permian Sulphur Creek suite forms sparse intrusions of K-feldsparaugen granite. The northern geology is dominated by the mid-Cretaceous Whitehorse plutonic suite and Mount Nansen Group volcanic rocks, that locally host Cu-Au porphyry and Au mineralization. Late Cretaceous Casino suite hypabyssal rocks are present sparsely across much of the area with and have known porphyry and epithermal mineral potential (e.g. Klaza). Paleogene volcanic and hypabyssal rocks are sporadically across the map, and are more prevalent to the southwest.