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Mineral Assessment of the Northern Kluane Wildlife Sanctuary, Yukon
The mineral potential of the Northern Kluane Wildlife Sanctuary (KWS) is rated as HIGH. Within the KWS, rocks of the Wrangellia Terrane rate the highest as they include two mineral deposits with proven reserves, one past producer, favorable stratigraphy for a variety of mineral deposits with production history and proven reserves elsewhere in the Cordillera as well as over 45 mineral occurrences within the boundaries of the KWS. Ultramafic hosted Ni-Cu-PGE; Fe, Cu, Au skarn, replacement or basaltic copper, VMS and polymetallic vein deposits are hosted in this belt of extremely high mineral potential. Pennsylvanian and post-accretionnary Cretaceous and Tertiary plutons are also of high potential for a variety of mineral deposit types including porphyry copper, epithermal gold and silver, skarns and polymetallic veins. Sedimentary and volcanic rocks of the Gravina-Nutzotin belt are host to VMS, skarn, and gold and polymetallic vein occurrences. The lower part of the Alexander Terrane, which is exposed within the KWS, contains few mineral occurrences locally but, at a regional scale, contains numerous important and varied mineral deposits. The Triassic succession of Alexander Terrane is not known to outcrop within the KWS although similar Triassic rocks of the Karmutsen Assemblage do. The Alexandrian portion of the KWS occupies the most remote and ice covered corner of the study area. The mineral potential of the Wrangell lavas and related plutons is not well understood. More mapping is needed in order to define the extent of the reported but undocumented felsic end member of this suite. A sliver of Coast Plutonic Metamorphic Complex and Kluane Schist occurs within the KWS. The Amphitheater assemblage and the Quaternary cover are the lowest rating units. Geological map coverage is very poor for the area between the White and Donjek Rivers and needs to be upgraded in order to determine the extent of high potential rocks in that part of Wrangellia.
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Bedrock Geology and Mineralization of the Klondike Area (West), 115O/14, 15 and 116B/2, 3
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Geological map (1:50,000 scale) of the West Klondike area, central Yukon (NTS 115O/14,15 and 116B/2,3) including marginal notes on mineral occurrences.
Bedrock Geology and Mineralization of the Klondike Area (East), 115O/9,10,11,14, 15,16 and 116B/2, Yukon
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Geological map (1:50,000 scale) of the East Klondike area, central Yukon (NTS 115O/9,10,11,14,15,16 and 116B/2) including marginal notes on geologic history, economic geology and mineral occurrences.
New insights into the geology and mineral potential of the Coast Belt in southwestern Yukon.
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The southwestern Yukon Coast Belt mapping project is a joint Yukon Geological Survey/Geological Survey of Canada initiative operated under Natural Resources Canada’s GEM (Geomapping for Energy and Minerals) program. This project is aimed at investigating the geological relationships and mineral potential of the Kluane Schist, the Ruby Range batholith and the Yukon-Tanana terrane in southwestern Yukon. Bedrock mapping at 1:50 000-scale followed a 400 m line-spaced aeromagnetic survey flown in the winter of 2010. Preliminary results indicate the presence of a northeast-dipping structural stack through an ~40 km-thick crustal section, whereby the Kluane Schist occupies the lowest structural level and the Yukon-Tanana terrane the highest. The Ruby Range batholith intruded along the contact between the Kluane Schist and the Yukon-Tanana terrane, and was emplaced late in the deformation history. An orthogneiss/paragneiss unit of unknown tectonic affinity was mapped structurally between the Ruby Range and the Kluane Schist. Detrital zircon analyses from two samples of Kluane Schist indicate that the onset of deposition for this metasedimentary sequence occurred after ca. 94 Ma. Two significant metamorphic events, dated at 82 and 70 Ma, affected the Kluane Schist. This indicates that original structural juxtaposition between the Kluane Schist and the Yukon-Tanana terrane pre-dated intrusion of the Ruby Range batholith. Mineral potential in the Coast Belt area is significant and includes porphyry Cu-Mo-Au, epithermal Au-Ag and orogenic Au occurrences. The upper level of the Ruby Range batholith is most prospective for porphyry and epithermal mineralization, while the Kluane Schist is most prospective for orogenic Au mineralization.
Klaza project: An expanding high-grade Au and Ag resource in the Mount Nansen gold camp
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Kluane Ranges bedrock geology, White River area (Parts of NTS 115F/9, 15 and 16; 115G/12 and 115K/1, 2)
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The Kluane Ranges, located in southwest Yukon, are underlain by Late Paleozoic to Late Triassic volcanic and sedimentary rocks assigned to Wrangellia. Bedrock mapping completed within the White River area indicates Wrangellian rocks underwent several phases of deformation between Late Triassic and Miocene time. Middle Triassic marine, fine-grained sedimentary rocks are preserved in grabens where they are overlain by basal conglomerates and breccias of the Nikolai formation. The grabens are related to uplift associated with the deposition of Nikolai formation flood basalts and intrusion of ultramafic bodies. Late Jurassic to Early Cretaceous compression resulted in structural stacking of older rocks and northeast- and southwest-verging overturned folds. Latest (?) Cretaceous to Miocene dextral strike-slip along the Denali fault system led to the formation of steeply dipping faults, extensional and compressional basins and refolding of older regional scale folds. Reactivation of Jura-Cretaceous faults also occurred at this time. An enigmatic pre-Middle Triassic deformation event is believed to be preserved locally in rocks of the Hasen Creek Formation.
Windy McKinley terrane, Stevenson Ridge area (115JK), western Yukon: composition and proposed correlations, with implications for mineral potential.
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Recent mapping in the ‘Windy McKinley’ terrane of Stevenson Ridge area of western Yukon defined two subdivisions of the terrane, an imbricated ophiolite and a succession of predominantly fine-grained, variably carbonaceous and calcareous clastic rocks extensively intruded by Middle Triassic gabbro. Further work in 2007 has revealed a third subdivision of felsic metavolcanic and carbonaceous clastic rocks, also spatially associated with voluminous gabbro. The two subdivisions of the terrane containing gabbro are reminiscent of the two subdivisions of the Delta district of Alaska, and gabbroic rocks from the two areas are coeval and geochemically similar. If the Stevenson Ridge successions correlate with those of the Alaska Range, the mineral potential of the Stevenson Ridge area would be appropriately increased.
Geology, mineralization and sampling results from the Kalzas tungsten property, central Yukon
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Kalzas, in central Yukon, is a porphyry-style stockwork and sheeted-vein wolframite deposit. Alteration includes a potassic core, a quartz-tourmaline-sericite zone and an outer quartz-sericite-pyrite zone, the latter in excess of 2 km in diameter. Wolframite is confined to the inner two zones, in an oval area 1500 m by 800 m. The wolframite is disseminated within the quartz-tourmaline stockwork and also occurs as coarse crystals in sheeted veins. Mineralization occurs within Neoproterozoic to Early Cambrian Hyland Group quartzites and phyllites, which are likely intruded at depth by a pluton, possibly of the Cretaceous Tombstone Suite. From 1981 to 1984, Union Carbide carried out mapping, soil and rock geochemistry, an airborne magnetometer survey, road building, trenching and drilling of two diamond drill holes. Results from Copper Ridge's 2001 sample program range from 0.3% WO3 to 0.5% WO3 over widths up to 70 m. They demonstrate the potential to define a signifi cant resource of surface-mineable tungsten mineralization at a grade of 0.4% WO3 or better. Drilling is required to confirm grade continuity at depth and along strike.
New data on the geology and mineralization of the Skukum Creek gold-silver deposit, southern Yukon (NTS 105D/3).
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Detailed exploration conducted during 2006 in the western part of the Skukum Creek deposit has revealed new structural, mineralogical and geochemical features. The deposit incorporates a number of (at least six or seven) sub- parallel narrow mineralized zones, coincident with andesite-dacite-rhyolite dyke swarms extending for at least 1 km along strike and for hundreds of metres down-dip. Various mineralized zones differ in size, structural setting, intensity and composition of mineralization, and, in total, form a large mineralized package more than 200 m wide, corresponding to a property- to district-scale fault zone extending for over 10 km and traced by a dyke belt. Significant potential exists for the exploration of these structures along strike and down-dip. The diamond drilling intersected numerous high-grade intercepts of gold and silver mineralization corresponding to the low-sulphidation sub-type of epithermal gold-silver deposits. However, strong enrichment in base metals (up to 25% of combined Zn+Pb+Cu) and arsenic suggests essential differences from typical epithermal mineralized systems.
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