Geological map (1:50,000 scale) of the Hopkins Lake area, southwestern Yukon (NTS 115H/7) including geological cross sections, mineral occurrences and isotopic age determinations.

Geological map (1:50,000 scale) of the Hopkins Lake area, southwestern Yukon (NTS 115H/7) including geological cross sections and mineral occurrences.

Paleozoic and older metamorphic rocks in the Aishihik Lake and Hopkins Lake map areas (115 H/6 and 7) comprise the Aishihik Metamorphic Suite (AMS) and form a north-northwest-trending panel of rock that dips regionally to the east. The suite is divisible into a lower feldspathic quartz micaschist and marble package with a minor component of metaigneous rock and an upper package that includes black and brown quartzite, marble, metabasite and orthogneiss. Igneous rocks of three plutonic suites and one volcanic suite are present in the study area. Foliated hornblende granodiorite of the Aishihik Batholith, part of the Aishihik Plutonic Suite (APS), intruded in the Early Jurassic resulting in upper amphibolite grade metamorphism of the AMS. Relatively mafic APS plutonism evolved rapidly into more leucocratic quartz monzonite of the Early to Middle Jurassic Long Lake Plutonic Suite (LLPS). The Ruby Range Plutonic Suite (RRPS), including the Ruby Range Batholith and isolated stocks and tear-shaped plugs north of the batholith, intruded in the Late Cretaceous to Early Tertiary resulting in contact metamorphism and potassic metasomatism of the AMS. Sub-volcanic dykes and plugs that intrude the AMS are spatially associated with, and are thought to be genetically related to, Eocene strata of the Mount Creedon Volcanic Suite (MCVS). MCVS strata unconformably overlie all other rocks in the study area. Potential exploration targets include:: massive sulphide deposits associated with black quartzite of the AMS; Cu skarn and porphyry deposits related to isolated stocks and tear shaped plutons of the RRPS; Cu-Au porphyry deposits associated with sub-volcanic plugs related to the MCVS; and mineralized east-trending quartz veins which may be related to a buried intrusion, possibly of the RRPS.

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This map is a Yukon Geological Survey contribution to the Geological Survey of Canada Geo-mapping for Energy and Minerals (GEM) program, Multiple Metals Northwest Canadian Cordillera (MMNCC) project.

Geological map (1:50,000 scale) of Tiny Island Lake map area, central Yukon (NTS 105M/16) including mineral occurrences, geological cross sections, structural relations, mesoscopic fabric data and descriptive notes on stratigraphy, intrusive rocks, structure, metamorphism and guide to mineral exploration.

Bedrock mapping, during the summer of 2013, within the Granite Lake area was completed as part of the first year of a multi-year project to investigate the geological relationships in southwest Yukon. Several different tectonostratigraphic elements were identified including rocks of the Yukon-Tanana terrane, the Kluane schist, and the Bear Creek assemblage. These were tectonically juxtaposed into a northeast dipping structural stack with the Yukon-Tanana terrane occupying the highest structural level, followed by the Kluane schist and the Bear Creek assemblage. Two plutonic phases of probable mid-Cretaceous and Late Cretaceous age were identified to intrude the Kluane schist and the Yukon-Tanana terrane respectively. A large Paleocene aged batholithic intrusive suite, the Ruby Range suite, intrudes across all tectonic boundaries.Tectonic and stratigraphic relationships observed in southwest Yukon are strikingly similar to those found in southeast Alaska, near Juneau. These similarities increase the potential for Juneau gold-belt type mineralizing systems extending into southwest Yukon.

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