AndreaBozzo/ceres-open-data-index huggingface dataset:
Preliminary results on the Middle Triassic-Middle Jurassic stratigraphy and structure of the Teslin Mountain area, southern Yukon

Stratigraphic and structural relationships within Stikinia, and overlap assemblages of the Whitehorse trough, are investigated in the Teslin Mountain area, southern Yukon. The Middle Triassic Joe Mountain Formation is dominated by a thick sequence of aphyric basalt produced by subaqueous volcanism. The Upper Triassic Lewes River Group displays complex lateral and vertical lithological and facies changes. It illustrates synvolcanic terrane exhumation, with erosion of the volcanic upland leading to deposition of thick volcaniclastic sequences, in parallel with ongoing clastic and carbonate sedimentation in marginal basins. Unravelling the Lewes River Group stratigraphy is critical in understanding the latest stages of Stikinia arc volcanism and the onset of Whitehorse trough marine sedimentation in the Early-Middle Jurassic. Further mapping and analytical work will focus at characterizing the Joe Mountain Formation and Lewes River Group, to determine how Stikinia evolved prior to final amalgamation of the Intermontane terranes with North America.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of the Mount Brenner Stock near Dawson City, Yukon Territory

The Mount Brenner stock has intruded folded sedimentary and meta sedimentary rock that lie 40 miles northeast of Dawson City, Yukon. The stock consists of four major concentric zones: (l) an outer zone of fine to medium-grained augite-biotite monzonite; (2) a zone of very coarse-grained monzonite porphyry; (3) an intermediate zone of porphyritic horn blende monzonite; and (4) a central zone of coarse-grained pink quartz monzonite porphyry. Except for the outer zone, all rock types are porphyritic and the alignment of feldspar phenocrysts gives the rocks a primary flow structure which conforms to steeply outward dipping gradational internal contacts. All external contacts are sharp. The regional structural trend is modified in the vicinity of the stock so that beds are generally conformable with the intrusive contact. From structural evidence, it is concluded that at the present level of erosion, the stock was emplaced by forceful injection. The different rock zones of the stock can be accounted for by differentiation of an augite-biotite monzonite magma by a combination of crystal fractionation, volatile and alkali diffusion, and multiple intrusion.

This thesis is available online at https://open.library.ubc.ca/cIRcle/collections/ubctheses/831/items/1.0053527. A copy of this thesis is available from the EMR library – QE195 L35.

Organization: Government of Yukon | Gouvernement du Yukon
Soft sediment textures in clasts in Wernecke Breccia: Reconstruction of an eroded late Paleoproterozoic succession in northern Yukon

The 1.60 Ga hydrothermal Wernecke Breccia are hosted within metasedimentary rocks of the Wernecke Supergroup and exposed in the Wernecke, Ogilvie and southern Richardson Mountains of northern Yukon. Breccia clasts with soft sediment deformation textures were previously identified and interpreted as fragments of the Wernecke Supergroup that were torn off and carried upward during mud volcanism. This model was subsequently discounted because field relations and geochronology indicated that the Wernecke Supergroup was lithified and metamorphosed prior to brecciation. Our recent work confirms the presence of soft sediment within zones of Wernecke Breccia and demonstrates the need for an unlithified sediment source. Two types of soft sediment materials have been identified: red mudstone to sandstone, and green mudstone. These unlithified sediments were likely derived from late Paleoproterozoic water-saturated sediments. During breccia formation, the surface was breached and fragments of the unlithified sediments foundered into the breccia zones, mixing with clasts of lithified wallrock. The sediments descended to depths of at least 4 km where they were lithified and encased by hydrothermal cement. Subsequent erosion removed the source beds and exposed the breccia zones.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Digital Geology

Geographic Information Systems (GIS) spatial database of bedrock geology, surficial geology, mineral deposits, paleontology and geochronology for the Yukon Territory. It also contains a portfolio of georeferenced regional aeromagnetic images.

All spatial database files are provided in two projections. The UTM coordinate system (disc 2) is commonly used at detailed scales. Albers equal area projection (disc 1) is provided to allow viewing or querying of larger areas that cross UTM zone boundaries. The datafiles are provided in various formats including an ARC/INFO coverage library, ARC/INFO interchange format (*.e00) and shapefile format (*.shp).

Organization: Government of Yukon | Gouvernement du Yukon
Geology of the Division Mountain Coal Deposit of Cash Resources Ltd.

The Division Mountain coal deposit lies within the Tanglefoot Formation which is interpreted as a complex fluvial-deltaic system, probably of Middle Jurassic age. Drilling has outlined undiluted mineable reserves of 31.7 million tonnes of High Volatile Bituminous "B" coal with a strip ratio of 3.36 bank m3/tonne.

Organization: Government of Yukon | Gouvernement du Yukon
Mineral Industry Report 1969 - 70

This report is a summary of activity by the mineral industry in the Yukon Territory and the southwestern District of Mackenzie during 1969 and 1970, by the Northern Economic Development Branch of the Department of Indian Affairs and Northern Development. The information was obtained from visits to properties, correspondence with company personnel, technical reports of companies, newspapers and trade journals and from the reports of the Mining Recorders of the Dawson, Mayo, Watson Lake and Whitehorse Mining Districts.

Organization: Government of Yukon | Gouvernement du Yukon
Blende property, central Yukon

The Blende is a large epigenetic zinc-lead-silver deposit hosted by brecciated middle Proterozoic dolomite. Mineralization occurs intermittently along a zone about 6 km long and up to 200 m wide. Based on 1990 drilling, reserves are estimated at 11.4 million tonnes grading 2.2% Zn, 3.0% Pb and 50.1 g/t Ag.

Organization: Government of Yukon | Gouvernement du Yukon
Geochronometric study of a Tertiary lamprophyre, MacMillan Pass, Yukon Territory

During 1977, Archer, Cathro and Associates Limited noted a number of conformable or paraconformable sills, at least 30 cm thick, of locally vesicular porphyritic augite-hornblende-biotite lamprophyre. Potassium argon analyses of biotite and hornblende indicate a concordant Upper Eocene age. Rubidium strontium isotopic data indicates a 87 Sr/86 Sr ratio of 0.7066. The calculated initial ratio, using a 40.3 Ma age, is 0.7065. This initial ratio is not unreasonable for alkalic igneous rocks in anorogenic settings.

Organization: Government of Yukon | Gouvernement du Yukon
Ag-Pb-Zn Mineralization in the MM Deposit and associated Mississippian felsic volcanic rocks in the St. Cyr Range, Pelly Mountains

A sequence of Mississippian felsic volcanic rocks up to 600 m thick occurs in the St. Cyr Range of the Pelly Mountains. The volcanic rocks occur in a belt 80 km long and up to 25 km wide. This belt lies within the Pelly-Cassiar Platform which is bounded to the southwest by the Yukon Crystalline Terrane and to the northeast by the Selwyn Basin. Chemical analyses indicate that most of the volcanic rocks of the Seagull Creek volcanic belt are alkali rich and potassic.

Silver, lead and zinc in the form of argentiferous galena and sphalerite and barium in barite constitute most of the mineralization associated with the volcanic rocks. Two main styles of mineralization occur:: stratabound-tpe and vein-type.

A model of origin for the deposit is speculative, but at this preliminary stage, two classes of stratiform mineralization are proposed for this area, both related to exhalative centres. The first type is local (proximal) and consists of more massive and thicker layered sulphide units interbedded with the regional clastic and exhalite horizons. The second type of mineralization is regional (distal) in extent and consists of barite and chert horizons with minor to negligible amounts of disseminated and/or thinly layered sulphide.

Organization: Government of Yukon | Gouvernement du Yukon
Active-layer detachments following the summer 2004 forest fires near Dawson City, Yukon

Numerous active-layer detachments occurred in watersheds surrounding Dawson City following forest fires that burned the area during the summer of 2004. The distribution of these shallow landslides was mapped in the Mickey Creek, Steele Creek and Fifty Mile Creek watersheds. Selected slope failures were surveyed in detail to describe their geometry and geomorphological settings in order to investigate the mechanisms of failure, and to assess the effects of the forest fires on local permafrost conditions. The failures generally initiated on moderate convex slopes at shallow depths (< 65 cm ) in silty colluvium; frost tables were close to 1 m in depth. Most active-layer detachments
were on the order of 5-20 m wide and 10-100 m long and occurred on slopes with a variety of aspects; however, the detachments occurred only where permafrost was present. In some cases, they developed on gentle slopes (as low as 10°) and traveled several hundred metres, depositing sediment directly into creeks, or across access trails. Their cumulative effects may significantly impact sediment transport within the watersheds. Potential concerns for fish habitat and implications for placer mining water quality regulations have consequently been raised.

Organization: Government of Yukon | Gouvernement du Yukon
Intrusive-breccia-hosted gold mineralization associated with ca. 92 Ma Tombstone Plutonic Suite magmatism: An example from the Bear Paw breccia zone, Clear Creek, Tintina gold belt, Yukon

The Bear Paw breccia zone is located at the Clear Creek property in the Tintina gold belt, central Yukon Territory. Gold mineralization occurs in hydrothermal breccias with stockwork quartz + potassium-feldspar + sulphide veins that overprint earlier intrusive and tectonic breccias. Grades of up to 2.3 g/t gold over 31.8 m have been intersected in recent drilling. The Bear Paw breccia zone is 1.5 km from any significant-sized granitoid stock and thus is indicative of the high potential for gold mineralization outboard of Tombstone Plutonic Suite stocks.

Organization: Government of Yukon | Gouvernement du Yukon
Substance Use Surveillance Reports

This report highlights the impact of substance use on the health and well-being of Yukoners. It uses data from Emergency Medical Services, Yukon hospitals, and the Chief Coroner to show how substance use affects people in the territory, identify populations who may benefit from support, support action by health systems and governments, and build public awareness. The report will be updated quarterly.

Organization: Government of Yukon | Gouvernement du Yukon
Bedrock geology of southwest McQuesten (NTS 115P) and part of northern Carmacks (NTS 115I) map area

The Southwest McQuesten-northern Carmacks area is primarily underlain by rocks of the Yukon-Tanana terrane which is divided into two distinct belts separated by the Willow Creek fault: 1) a central belt of polydeformed, upper greenschist-amphibolite facies metasedimentary and metaplutonic rocks of Permian and older ages; and 2) a northeastern belt of generally undeformed and unmetamorphosed volcano-plutonic rocks of the Early Mississippian Reid Lakes complex. The southern part of the area is underlain mainly by rocks of Quesnellia and Stikinia, including: 1) Paleozoic retrogressed metamorphic rocks of the Boswell assemblage; 2) Upper Triassic augite-phyric volcanic rocks; and 3) Early Jurassic granitoids of the Aishihik plutonic suite. These rocks are dissected by a series of dextral strike-slip faults, probably related to the Teslin fault system. Post-accretion rocks include: 1) mid-Cretaceous biotite monzogranite plutons; 2) dacite and minor basalt of the Upper Cretaceous Carmacks Group; and 3) Quaternary basalt of the Selkirk volcanics. The southwest McQuesten-northern Carmacks area is under-explored, but shares many geological attributes with nearby, highly prospective districts such as the Dawson Range mineral belt, the recently discovered White Gold area and the producing Minto Mine.

Organization: Government of Yukon | Gouvernement du Yukon
Brewery Creek gold deposit, central Yukon

The Brewery Creek mine is a bulk tonnage gold deposit located 57 km east of Dawson City, in central Yukon, within the foothills of the Ogilvie Mountains along the northeastern boundary of the Tintina Trench. High-level fracture-controlled gold mineralization is hosted within Cretaceous monzonite sills and Devonian Earn Group siliciclastic rocks of the Selwyn Basin. Structural controls include northeast and southeast sub-vertical shears bounded by moderately south-dipping, southeasterly-extending listric normal faults; listric faulting and sill emplacements are localized along pre-existing graphitic thrust faults. Gold occurs as sub-micron particles in solid solution with pyrite and arsenopyrite as growth bands around larger sulphide grains that are disseminated within fine quartz veinlets. The open-pit heap leach operation produces 75,000 - 80,000 ounces annually, with a stripping ratio of 1.5:1 and a cash cost of US$200/oz or less. The mineable reserves at the end of 1997 stood at 13.3 MT @ 1.44 gpt (613,000 oz).

Organization: Government of Yukon | Gouvernement du Yukon
Surficial geology investigations in Wellesley basin and Nisling Range, southwest Yukon.

Results of surficial geology investigations in Wellesley basin and the Nisling Range can be summarized into four main highlights, which have implications for exploration, development and infrastructure in the region: 1) in contrast to previous glacial-limit mapping for the St. Elias Mountains lobe, no evidence for the late Pliocene/early Pleistocene pre-Reid glacial limits was found in the study area; 2) placer potential was identified along the Reid glacial limit where a significant drainage diversion occurred for Grayling Creek; 3) widespread permafrost was encountered in the study area including near-continuous veneers of sheet-wash; and 4) a monitoring program was initiated at a recently active landslide which has potential to develop into a catastrophic failure that could damage the White River bridge on the Alaska Highway.

Organization: Government of Yukon | Gouvernement du Yukon
Surficial geology of Rhyolite Creek (115G/16), Yukon (1: 50 000 scale)

The Rhyolite Creek map area is on the northeastern side of the Nisling Range. Summits and ridges in this part of the Nisling Range are between 1400 m and 1800 m above sea level. Much of the upland surface is treeless and is covered with weathered bedrock colluvium. Upland surficial deposits are affected by active periglacial processes such as cryoturbation, nivation and solifluction.

Organization: Government of Yukon | Gouvernement du Yukon
Georeferenced Bedrock Geology 250k maps

These georeferenced pdf maps contain the most current bedrock geology information in Yukon. They are intended for use in software such as Avenza PDF Maps. The geological data used to create these maps can be downloaded at https://data.geology.gov.yk.ca/Compilation/3. 

These maps are subject to periodic updates. The Yukon Geological Survey welcomes any revisions or new geological information. Any questions or comments can be directed to geology@gov.yk.ca.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Exploration and Geology Overview 2024

Yukon Exploration and Geology (YEG) papers and the Yukon Exploration and Geology Overview are two of the main publications of the Yukon Geological Survey (YGS; Energy, Mines and Resources, Government of Yukon). Individual YEG papers, with colour images, are available in digital format only. The YEG Overview is available in digital format and in a limited colour print run. All YGS publications can be downloaded from our website, https://data.geology.gov.yk.ca/.

Yukon Exploration and Geology 2024 contains up-to-date information on mining and mineral exploration activity, studies by industry and results of recent geological field studies. Information in this volume comes from prospectors, exploration and government geologists, mining companies and students, all of whom are willing to contribute to public geoscience for the benefit of the scientific community, the public and the mineral industry of the Yukon. Their work is appreciated.

Organization: Government of Yukon | Gouvernement du Yukon
Bedrock Geology of NTS 106B/04, Eastern Rackla Belt

The NTS 106B/04 map area straddles the upper reaches of the Stewart River in east-central Yukon. The area north of the Stewart River is underlain by Ediacaran clastic and carbonate continental slope deposits of the uppermost Windermere Supergroup, and by Ediacaran-Cambrian rocks of the Hyland Group (Selwyn basin). The area south of the Stewart River is dominated by the Cambrian Gull Lake Formation and Cambrian (-Silurian?) volcanic rocks of the Old Cabin Formation. The main structures in 106B/04 define an arcuate pattern; they are oriented NW-SE in most of the area, but are approximately E-W in the westernmost part of the map area. These structures include upright, gently-plunging folds and steeply-dipping, axial-planar cleavage. Folding was locally accompanied by thrusting. Late structures include a steeply-dipping sinistral fault that transects the central part of the map area and a number of NW-WNW-striking normal (± dextral) faults. Stratigraphic relationships suggest correlation of the upper Yusezyu, Algae, and Narchilla formations of the Hyland Group (Selwyn basin) with the upper Blueflower, Risky, and Ingta formations of the Windermere Supergroup (Ogilvie and Mackenzie platforms). Gold mineralization has recently been discovered in the Algae Formation, which has also been explored for Mississippi Valley-type lead-zinc-silver mineralization elsewhere in the area.

Organization: Government of Yukon | Gouvernement du Yukon
Beneficiation of Barite Ore

High grade, bedded barite deposits occur in upper Paleozoic sedimentary rocks of the Earn Group in south-eastern Niddery Lake map area. Following discovery and initial exploration of the TEA claims, the present owners have carried the property to the production stage through the construction, machine assembly and test operation of a beneficiation mill at Ross River.

The following conclusions were made by this study:
1) A bedded barite deposit has been identified on the TEA property in the Selwyn Mountains of the Yukon. It is of suitable tonnage to support any likely scale of production (5000 to 10,000 tonnes per year) for at least 25 years.

2) The barite is of suitable grade such that with moderate beneficiation (from a mine run grade of approximately 4.15 S.G., to drilling mud grade of 4.20) it should find a market in both northern Canada or Alaska, enjoying a transportation cost advantage over materials presently brought from Nevada.

3) The ore is amenable to beneficiation, based both on the preliminary laboratory work by Lakefield Research of Ontario and on the production scale test runs By H. Coyne and Sons Ltd., with the Mill at Ross River.

4) Laboratory equipment techniques of types approved by the American Petroleum Institute are being used for quality control of product at the Ross River mill. A barite standard of known and accepted specific gravity is used to check the calibrations and performance of this quality control system.

5) A determined market analysis has been conducted. The requested production samples are being provided to prospective purchasers in Alaska.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of the Quartet Mountain lamprophyre suite, Wernecke Mountains, Yukon

The Early Cambrian Quartet Mountain lamprophyres are volatile-rich ultramafic alkaline dikes that crosscut the Wernecke and Mackenzie mountains supergroups in the Wernecke Mountains of northern Yukon. Their emplacement may have been triggered by Early Paleozoic extension of the Cordilleran miogeocline. Numerous small-volume alkalic igneous rocks that range in age from Cambrian to Devonian occur elsewhere in the miogeocline and may reflect a similar tectonic setting.
The Quartet Mountain lamprophyres contain phenocrysts of phlogopite ± diopside ± olivine within a dark-grey aphanitic groundmass and were likely generated by low-percentage melting of mantle at depths >90 km. One of the lamprophyres contains abundant pseudomorphed olivine xenocrysts and xenoliths of inferred crustal and mantle affinities. Although this dike resembles kimberlite because of its abundance of mantle xenoliths and xenocrysts and its ultramafic composition, it differs from kimberlite in its abundance of phlogopite phenocrysts. It is best described as an ultramafic lamprophyre with kimberlitic affinity. The lamprophyres have modest potential to host diamonds.

Organization: Government of Yukon | Gouvernement du Yukon
Shaded Magnetic First Vertical Derivative, Yukon Territory/Northwest Territories; NTS 106K/NW-NE

This map was compiled from data obtained as a result of an aeromagnetic survey carried out by Fugro Airborne Surveys using a Cessna Caravan aircraft. A 0.005 nT sensitivity split-beam cesium vapour magnetometer was mounted in the tail boom of the survey aircraft. 
The survey operations were carried out from March 7 to May1, 2003. The nominal traverse line spacing was 800 m with control lies at 2.4 km spacing at a nominal terrain clearance of 200 m. A preplanned flight surface was calculated for this survey to minimize the control line and traverse line altitude differences. Flight path was recovered using a post flight differential Globa Positioning System, combined with a vertically mounted video camera.
After editing the survey data, the intersections of the control and traverse lines were established and differences in the magnetic values were computer analysed and manually checked to obtain the level network. The levelled total field values were then interpolated to a 200 m grid. The International Geomagnetic Reference Field has not been removed from the magnetic total field.

Organization: Government of Yukon | Gouvernement du Yukon