AndreaBozzo/ceres-open-data-index huggingface dataset:
Geology and U-Pb zircon geochronology and Pb isotope geochemistry of mid-Cretaceous plutonic rocks in the Mount Nansen map area (NTS 115I/3 and part of 115I/2)

The geology in the Mount Nansen area, of the Dawson Range, comprises a metamorphic basement overlain and intruded by mid and Late Cretaceous magmatic rocks. Mid-Cretaceous epithermal deposits are recognized in the Brown-McDade cluster in the south, and Late Cretaceous porphyry and epithermal occurrences in the centrally located Klaza cluster. Here we report eight new U-Pb zircon crystallization ages, two CA-TIMS and six LA-ICPMS, and Pb isotopic data for igneous feldspar from six samples. A 199.06 ± 0.96 Ma crystallization age demonstrates the host rock to the Brown-McDade deposit is the Late Triassic to Early Jurassic Minto suite. We report crystallization ages of 111 ± 1.8 Ma for the Dickson Hill porphyry, 107.96 ± 0.03 and 107.86 ± 0.03 Ma for the central and border phases of the Bow Creek granite, respectively, and 107.0 ± 0.72, 107.0 ± 0.78 and 107.5 ± 0.67 Ma for equigranular and porphyritic phases of the Dawson Range granodiorite. These ages confirm a mid-Cretaceous Whitehorse suite affinity for these rocks with porphyritic textures suggesting high-level emplacement. Feldspar Pb isotopic data of igneous rocks in the Mount Nansen area become more radiogenic with time and are distinct for Late Triassic to Early Jurassic plutonic rocks versus Cretaceous rocks. Cretaceous feldspar isotopic data broadly overlaps Pb isotopic values of galena from deposits throughout the Dawson Range suggesting coeval magmatic rocks are a significant source of metals.

Organization: Government of Yukon | Gouvernement du Yukon
Brewery Creek: From assessment and permitting through producation to post closure: A post closure analysis of a northern heap leach mine

This study was first conceived as an attempt to document the processes undertaken for the Brewery Creek Mine (referred to as Brewery Creek in this report) in the Yukon Territory and provide a description of the lessons learned from this process. The hope is that this report will be used in the future as a tool for regulatory authorities, assessors, resource development companies, and First Nations for analyzing and planning resource development projects. This report provides an analysis of some of the aspects of the first heap leach mine north of 600 from planning through to post-closure monitoring, start to finish by comparing expectations and predictions versus reality and the lessons learned through the entire process.

Organization: Government of Yukon | Gouvernement du Yukon
Paleomagnetic study of the Late Cretaceous Seymour Creek stock, Yukon: Minimal geotectonic motion of the Yukon-Tanana Terrane

Paleomagnetic results are presented for 154 specimens from 16 sites in the Late Cretaceous Seymour Creek stock, a small granodioritic intrusion emplaced into Paleozoic gneisses and schists of the Yukon-Tanana Terrane (YTT), west-central Yukon. Stepwise demagnetization of the specimens revealed steep characteristic remanent magnetization directions in 2 normal- and 14 reversed-polarity sites with a mean direction of declination D=65.0°, inclination I =-83.6° (alpha 95 = 4.3°, k =73.8). Geological relations suggest that the stock has not been tilted since its emplacement at 68.5 ± 0.2 Ma. The paleopole for the Seymour Creek stock at 55.2°N, 202.5°E (dp =8.3°, dm=8.5°), plots south of the North American apparent polar wander path. This suggests that the YTT has experienced a net 79° ± 36° counter-clockwise rotation, and a nonsignificant 2.4° ± 7.5° anti-poleward translation relative to North America since 68.5 Ma. This result does not agree with the previously reported large poleward translation and minimal rotation estimated for the YTT from paleomagnetism of the coeval Carmacks Group volcanic rocks.

Organization: Government of Yukon | Gouvernement du Yukon
The Early Tertiary Sifton Range volcanic complex, southwestern Yukon

The early Tertiary magmatic episode in the northern Canadian Cordillera is linked to the restructuring of the Kula-North American plate system from orthogonal to oblique convergence. Resultant volcanism was widespread, and remnant successions outcrop along the eastern margin of the Coast Plutonic Complex (CPC). The Sifton Range volcanic complex of southwestern Yukon is a member of the Paleogene Sloko-Skukum Group, and comprises a 900-m thick, shallow-dipping, volcanic succession dominated by intermediate to evolved lava and pyroclastic rocks deposited in a northwesterly trending half-graben. Locally, the volcanic sequence is intruded by alkali-feldspar granites of the CPCs Nisling Plutonic Suite dated at 57.5 Ma. Felsite sills radiate from the main intrusive body, and together with numerous basaltic to dacitic dykes traverse the volcanic package. Both the felsic volcanic rocks and epizonal granitoids exhibit anomalous enrichments in large-ion lithophile elements indicating crustal contributions during the late-stage petrogenesis of the complex. In addition, the Sifton Range intrusive rocks exhibit modal mineralogy reflective of lower ambient pressures relative to the compositionally similar Annie Ned granites along the Alaska Highway between Stony Creek and Mendenhall, 20 km south of the complex. The amount of post-Eocene uplift (ca. 30 m/Ma) that exposed the contact between the intrusive and corresponding volcanic rocks is constrained by the presence of a calc-silicate bed at an elevation of 1830 m within the upper volcanic stratigraphy.

Organization: Government of Yukon | Gouvernement du Yukon
Follow-up Monitoring: Shrub Trial Plots at Brewery Creek Mine and Bioengineering Trials at Noname Creek

Two MERG-sponsored mine reclamation projects were surveyed during the summer of 2002. These included the Brewery Creek Mine where local shrubs were planted in large open areas at the mine site in 2000, and Noname Creek near Big Creek west of Carmacks where, in 2001, live willow cuttings were used at an abandoned placer mine to stabilize an eroding gully in permafrost. Because the effectiveness of reclamation projects such as these can only be determined after several year of observation, the two mine sites were revisited in 2002 to record the successes and failures of the experimental work and to make suggestions on where improvements can be made.

Organization: Government of Yukon | Gouvernement du Yukon
2021 Wildland fire management bulletins

Archived wildfire bulletins from 2021. See [current wildfire bulletins on Yukon.ca](https://yukon.ca/blogs/wildfire-bulletins).

Visit the Yukon's [Wildfires hub](https://wildfires.service.yukon.ca/) or the [text-only updates page](https://yukon.ca/en/emergencies-and-safety/wildfires/get-text-only-wildfire-updates) to get more information about current wildfire conditions in the Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Summary of Rock-Eval data for the Whitehorse trough, Yukon: implications concerning the hydrocarbon potential of a frontier basin

Whitehorse Trough is a frontier basin in south-central Yukon that is thought to contain gas and possibly oil. Over 400 samples from the Whitehorse Trough have been analysed by programmed pyrolysis and combustion, which together with coal rank, vitrinite reflectance, and the colour of microfossils indicate the following: the Povoas formation has no source rock potential; the Aksala formation is a poor source rock, probably gas-prone and postmature; the Richthofen formation is a poor to fair source rock, gas-prone and postmature; the Nordenskiold formation has no source rock potential; and the Tanglefoot and Tantalus formations are potentially good to very good source rocks, mainly gas-prone with a possibility of oil and mature. The Aksala and Richthofen formations are interpreted as spent source rocks, whereas the Tanglefoot and Tantalus formations are interpreted as potential source rocks and possibly effective source rocks. The most prospective
areas for hydrocarbon exploration are Division Mountain, Tantalus Butte and Five Finger Rapids.

Organization: Government of Yukon | Gouvernement du Yukon
Isotope dating of lead-zinc occurrences in the Bonnet Plume area, Preliminary report

The Proterozoic to Cambrian carbonate rocks of the Bonnet Plume area are hosts to many lead-zinc occurrences. Some are classified as Mississippi-Valley-type deposits (MVTs) while others are thought to be veins. Six of the showings were sampled during the summer of 2000 for isotopic age dating (Pb/Pb) in order to help clarify classification and shed light on the timing of the different mineralization sources and processes.

Preliminary results show that some occurrences previously described as MVTs contain surprisingly high amounts of silver or antimony, elements usually indicative of higher temperatures than those usually associated with MVT deposits; while some evidence of stratigraphic replacement is observed in "vein" occurrences.

Organization: Government of Yukon | Gouvernement du Yukon
Evidence for a late-McConnell readvance of the Cassiar Lobe in Seagull Creek, Pelly Mountains, central Yukon

Drift prospecting in high relief areas of the Cordillera requires consideration of paleo-ice-flow reversals. This means rethinking the manner and degree to which glacial ice eroded, transported and deposited surficial sediments. The regional context, geomorphic landforms and sediment stratigraphy identified in the Seagull Creek valley suggest that late-glacial up-valley ice flow, although relatively short in duration, may have been the controlling process for glacial transport and deposition in this area. This interpretation has important implications for mineral exploration programs that utilize glacially transported materials for various forms of geochemical analysis. Geomorphic landforms and glacial dynamics responsible for reverse (up-valley) ice flow in Seagull Creek valley have important implications for mineral exploration on the Ross River Minerals Tay LP gold-copper property.

Organization: Government of Yukon | Gouvernement du Yukon
Surface velocity measurements on the Kaskawulsh Glacier, Yukon Territory, Canada

Positions of 24 markers on the upper north arm of the Kaskawulsh Glacier were determined between July and August, 1964. Surface velocities over four time periods were computed from the position determinations and compared to mean seasonal velocities. Differences from mean seasonal values are randomly distributed.

Organization: Government of Yukon | Gouvernement du Yukon
Surficial geology, 115J/06, Yukon

The 115J/06 map area is located at the confluence of the Nisling and Donjek rivers. The main physiographic feature in the map area is the Nisling River valley that separates the Nisling and Dawson ranges. Uplands on either side of the Nisling River valley reach elevations of 1066 m and are unglaciated with exception to the southwest corner. The Nisling River valley reaches 5 km in width.

Organization: Government of Yukon | Gouvernement du Yukon
A preliminary report on Hart River (116 A/10) - A Proterozoic massive sulphide deposit

In 1966, a conspicuous orange red gossan south of Hart River in the Wernecke Mountains was prospected and staked. The gossan is developed over a stratiform massive sulphide body of Proterozoic age. The massive sulphide body is completely enclosed in black argillite of the Gillespie Lake Group. It has the shape of a vertical to moderately dipping southward facing tabular pod and has been traced from an elevation of 4,150 feet to 3,700 feet.

Pyrite and pyrrhotite are the most common sulphide minerals and along with minor amounts of sphalerite, chalcopyrite, galena and rare tetrahedrite, form about 90% of the massive sulphide.The deposit is interepreted to be synsedimentary with proximal exhalative features.

Exploration work was conducted for several years up until 1971. By this time a deposit of 0.5 to 0.6 million tons grading 0.04 oz/ton Au, 1.45 oz/ton Ag, 1.45% Cu, 0.87% Pb and 3.65% Zn had been proven.

Organization: Government of Yukon | Gouvernement du Yukon
Stratabound Barite and Lead-Zinc Deposits in Eastern Selwyn Basin, Yukon

The Macmillan Pass area, in east-central Yukon Territory, contains what promises to be some of the most valuable mineral deposits yet discovered in the Territory. In addition to the TOM and JASON stratiform lead-zinc-silver-barite deposits, the area contains one of North America's largest tungsten deposits (Mactung deposit) as well as a relatively large tonnage stratiform barite deposit (TEA deposit) presently being exploited for use as oil well drilling mud. This report specifically deals with the TOM and JASON deposits, based on field investigations carried out by the writer during July and August.

This report is accompanied by a 1:111 111-scale bedrock geology map of the TOM and JASON claims, Macmillan Pass area, east-central Yukon Territory (NTS 105 O/1 east half).

Organization: Government of Yukon | Gouvernement du Yukon
Multisensor airborne geophysical survey, Stewart River area, 115O/14

Data were acquired during an airborne geophysical survey (gamma ray spectrometer, magnetometer and VLF-EM) carried out by Fugro. Funding was provided by the Government of Yukon. The survey was completed between July 29 and September 21, 2000.

Organization: Government of Yukon | Gouvernement du Yukon
Paleoproterozoic deformation of the Racklan Orogeny, Slats Creek (106D/16) and Fairchild Lake (106C/13) map areas, Wernecke Mountains, Yukon

Three events of Paleoproterozoic deformation are recognized in schist of the Fairchild Lake Group (Wernecke Supergroup) in the Wernecke Mountains. The first event produced a chloritoid ± garnet and opaque porphyroblastic, chloritoid-chlorite-muscovite-quartz schist. Pressure-temperature conditions have been estimated to lie between 3-6 kbar and 450-550°C. The second event produced a crenulation, and the third generated kink bands. All of these features are crosscut by 1.60 Ga Wernecke Breccia. These events are regarded as products of the Racklan Orogeny, a Paleoproterozoic interval of orogenesis, which favourably correlates with the Fifteenmile Orogeny in the Ogilvie Mountains of western Yukon and the Forward Orogeny in the Northwest Territories.

Organization: Government of Yukon | Gouvernement du Yukon
Sedimentology of a high level terrace placer gold deposit, Klondike Valley, Yukon

Significant economic concentrations of placer gold were first recognized in an intermediate level terrace near Dawson City in the late 1980's Regional surficial mapping has shown the distribution of many high level terraces of pre-Reid, Reid and McConnell age in central Yukon, but the relationship between economic gold concentration and terraces is not well understood.

Sedimentological study of an intermediate level terrace near Dawson City suggests two river types have been dominant:: the first, a 'wandering gravel bed river' is characterized by moderate sinuosity, later accretion deposits, limited sand facies, and generally fine gravel; the second, 'proximal braided river' is characterized by multiple channels, very thick and crudely imbricate gravel, low bed relief, and a maximum particle size greater than the underlying wandering gravel bed river deposits.

The gold-bearing 'wandering gravel bed river' assemblage is typical of present-day conditions with river processes dominated by lateral migration and high gravel transport rates through the system, conducive to heavy mineral concentration during an interglacial period. The 'proximal braided river' is characteristic of nearby glacial ice and rapid sedimentation resulting in poor heavy mineral concentration. The transition from a wandering gravel bed river to a proximal braided river is suggested to mark the onset of a pre-Reid glaciation in the Southern Ogilvie Mountains. The sedimentology of the intermediate terrace gravels suggests a geomorphic model which may be used for exploration of terrace placer deposits in central Yukon with a similar pattern of regional glaciation influencing terrace formation.

Organization: Government of Yukon | Gouvernement du Yukon
2019–20 Supplementary estimates no. 1

Supplementary estimates no. 1 for the Government of Yukon 2019–20 Budget. 
This document was prepared by the Department of Finance under the direction of Management Board for the 2nd Session of the 34th Legislature, Yukon Legislative Assembly. October 2019, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Geology and mineralization of the AurMac metasediment-hosted gold deposits, central Yukon (NTS 105M/13)

The AurMac property, located 35 km north of Mayo in central Yukon, includes two metasedimentary rock-hosted gold deposits: the 6158 koz Au Powerline deposit and the 845 koz Au Airstrip deposit. Mineralization at the Powerline and Airstrip deposits is characterized by gold in sheeted quartz veins and mineralized skarn horizons, respectively. The AurMac deposits straddle the Robert Service thrust fault whereby the Powerline deposit is hosted in the Late Proterozoic to Cambrian Hyland Group hanging wall, and the Airstrip deposit is hosted in the Mississippian Sourdough Hill Member of the Keno Hill Quartzite footwall. Host rocks comprise siliciclastic metasedimentary rocks, variably calc-silicate–altered calcareous metasedimentary rocks and magmatic rocks. Magmatic rocks in the Powerline zone consist of foliated mafic horizons that are geochemically similar to Cambro-Ordovician magmatic rocks found in Hyland Group metasedimentary rocks in the McQuesten, Mayo, Clark Lakes and Hart River map areas. In the Airstrip zone, magmatic rocks include a steeply south-dipping, unfoliated, aplite dike. Evidence for intrusion-related gold mineralization at AurMac includes sheeted vein and skarn mineralization similar to the intrusionhosted, intrusion-related gold deposits at Dublin Gulch, as well as the presence of metamorphic porphyroblast assemblages that suggest contact metamorphism. These findings suggest potential for further discovery of mineralized intrusion-hosted zones on the AurMac property and sedimenthosted, intrusion-related gold deposits elsewhere in the region.

Organization: Government of Yukon | Gouvernement du Yukon
Application of placer and lode gold geochemistry to gold exploration in western Yukon

Placer gold is widely distributed throughout the western Yukon; however, lode sources for most of these deposits remain unknown. Previous studies of gold compositions in this region using scanning electron microscope (SEM) and electron microprobe (EMP) methods showed 1) that there are consistent differences in average composition (although with considerable overlap) between gold from different styles of lode gold mineralization; and 2) the composition(s) of placer gold can be matched with specific lode sources, or the most likely style of lode source can be identified. In the current study we employ SEM and EMP methods together with laser ablation ICP-MS trace element analysis and study of the micro-inclusion suite(s) to more completely characterize the major, minor and trace element composition of the gold as well as the mineralogy of the lode sources themselves. We also report new data for placer and lode gold, mainly from the Klondike District.

Organization: Government of Yukon | Gouvernement du Yukon
Surficial Geology of Watson Lake (NTS 105A/2), Yukon (1:50 000 scale)

This map was produced as part of a biophysical mapping pilot project study carried out in the Watson Lake (NTS 105A/2) area in 2004. Biophysical mapping (also known as ecological land classification) is an integral system of mapping describing terrain conditions (surficial geology, slope, landscape position, drainage and permafrost conditions) as well as ecological values (vegetation community and structure, and soil moisture and nutrient regimes). At a local (1:50 000) scale, biophysical maps are an essential tool for facilitating stewardship and sustainable development of energy, mineral and land resources.

Organization: Government of Yukon | Gouvernement du Yukon
Orogen-perpendicular magnetic segmentation of the western Yukon and eastern Alaska cordilleran hinterland: Implications for structural control of mineralization

This contribution focuses on the analysis, characterization, and mineralization control of northeast-southwest oriented, magnetic heterogeneities of the allochthonous to parautochthonous Intermontane terranes of the North American Cordillera of western Yukon and eastern Alaska. Our interpretation of publically available magnetic datasets proposes sixteen zones of linear discontinuities oriented semi-perpendicular to the northwest-southeast Cordilleran deformation front and mid-Cretaceous Dawson Range magmatic arc. These magnetite-destructive corridors are interpreted as steeply dipping, brittle fault zones and fracture arrays of extensional, oblique-extensional, and strike-slip kinematics responsible for localized structural damage. Their spatial correlation with known mid to Late Cretaceous magmatic-hydrothermal mineralization suggests a first-order structural control in eastern Alaska, while a secondary role is interpreted for Yukon’s Dawson Range.

Organization: Government of Yukon | Gouvernement du Yukon
Utilizing spectral induced polarization to identify the ice core of a pingo: A case study in Haines Junction, Yukon, Canada

This paper presents a field study conducted in Haines Junction, Yukon, utilizing Spectral Induced Polarization (SIP) to investigate the subsurface properties of a pingo site and specifically identify its ice core. The effectiveness of SIP analysis was demonstrated using a FUCHS frequency domain instrument, which measured electrical impedance magnitude and phase shift angle at multiple frequencies (1.46 Hz–40 kHz). The main focus of the analysis centered on the results obtained from electrical impedance magnitude and phase shift angle inversion at 40 kHz and 1.46 Hz. The inversion results revealed the presence of high resistivity layers within the subsurface, similar to results that would be expected with electrical resistivity tomography (ERT). Additionally, the SIP data revealed that some areas with high resistivity also had negative phase shift angle values, suggesting the presence of materials with polarizing properties. The analysis of the imaginary part of electrical impedance at 40 kHz for these areas highlighted the contribution of polarization, indicating the presence of ice. Furthermore, the electrical impedance magnitude at
1.46 Hz exhibited similarities to the 40 kHz analysis, but with higher resistivity. This pattern is another indicator of the presence of ice within the subsurface of the study area and was expressed using the Resistivity Frequency Effect (RFE) equation. The RFE analysis and the patterns of polarization confirmed the presence of the pingo ice core and identified its distinctive signature compared to other layers. Subsequent drilling confirmed the presence of interbedded ice and clay from 2.4–3.6 m depth and massive ice from 3.6–8.3 m depth.

Organization: Government of Yukon | Gouvernement du Yukon
2023 Wildland fire management bulletins

Archived wildfire bulletins from 2023. See [current wildfire bulletins on Yukon.ca](https://yukon.ca/blogs/wildfire-bulletins).

Visit the Yukon's [Wildfires hub](https://wildfires.service.yukon.ca/) or the [text-only updates page](https://yukon.ca/en/emergencies-and-safety/wildfires/get-text-only-wildfire-updates) to get more information about current wildfire conditions in the Yukon.

Organization: Government of Yukon | Gouvernement du Yukon