Plutonic rocks of Early and mid-Cretaceous age are associated with tungsten-molybdenum porphyry and skarn-style mineralization in the Logtung area (Yukon MINFILE 105B 039, Deklerk and Traynor, 2005) in southwestern Wolf Lake map area (105B), and with tin-tungsten (-copper, lead, zinc) skarn mineralization at the Mindy and Ork occurrences (Yukon MINFILE 105C 038 and 054, respectively, Deklerk and Traynor, 2005) in the Thirtymile Range in eastern Teslin map area (105C). We have determined laser ablation U-Pb zircon ages of 109.4 ± 0.9 Ma and 110.5 ± 0.8 Ma for two samples of a biotite monzogranite stock that is inferred to be comagmatic with the felsic dyke system that partially hosts the Logtung mineralization. The latter sample is from the same locality from which a U-Pb zircon age of ~58 Ma was previously reported for zircons inferred to be hydrothermal in origin. Two separate phases of the Thirtymile Stock gave U-Pb ages of 102.7 ± 1.1 Ma and 100.9 ± 1.4 Ma.
