AndreaBozzo/ceres-open-data-index huggingface dataset:
Total field magnetic, Wernecke Mountain Aeromagnetic Survey, NTS 106D (north half), Yukon

This map of the magnetic total field was derived from data acquired during an aeromagnetic survey carried out by Fugro Airborne Surveys during the period April 17, 2006 to August 26, 2007. The data were recorded using a split-beam cesium vapour magnetometer (sensitivity = 0.005 nT) mounted in the tail boom of a Cessna Caravan aircraft. The nominal traverse and control line spacings were, respectively, 800 m and 2600 m, and the aircraft flew at a nominal terrain clearance of 250 m. Traverse lines were oriented N30 degrees E with orthogonal control lines. The flight path was recovered following post-flight differential corrections to the raw Global Positioning System data and inspection of ground images recorded by a vertically-mounted video camera. The survey was flown on a pre-determined flight surface to minimize differences in magnetic values at the intersections of control and traverse lines. These differences were computer-analysed to obtain a mutually levelled set of flight-line magnetic data. The levelled values were then interpolated to a 200 m grid. The International Geomagnetic Reference Field was not removed from the magnetic total field.

Organization: Government of Yukon | Gouvernement du Yukon
The Tectonic Setting of the Aishihik Batholith, SW Yukon

The Aishihik Batholith is comprised of foliated and lineated, equigranular hornblende granodiorite and crystallized at about 216 Ma. The batholith is in contact to the west with a metamorphic terrane of continental affinity. However this contact lacks intrusive features common to the margins of most granitic batholiths. In addition, rocks adjacent to the contact are mylonitized and ductiley deformed. These relationships suggest that the Aishihik Batholith does not intrude the adjacent metamorphic terrane, but is allochthonous above it. Kinematic indicators are consistent with the Middle Jurassic quartz monzonite plutons cutting the detachment implying that tectonism occurred during, or prior to the Early Jurassic. The significance and regional extent of this detachment remains a matter of conjecture. The batholith, part of the Stikine volcanic arc, may have originally intruded the metamorphic terrane. Tectonic modification of this relationship could have occurred during collision of Stikinia with North America. Alternatively, Stikinia may be far travelled with respect to the batholith.

Organization: Government of Yukon | Gouvernement du Yukon
The gossan of a lead deposit in limestone, Yukon Territory

The interpretation of leached outcrops as guides to the specific minerals from which they were formed has been developed to a rather high degree by earlier workers, among whom Boswell and Blanchard deserve particular mention. In the present work, a gossan that led to the discovery of a lead deposit is described. Since many hand specimens of the limonite from this gossan lack the characteristic boxwork structures described by the authors above, microscopic investigations of thin and polished sections were carried out. However, the gossan is classified into six types mainly on the basis of its physical properties. At least three of these are correlated with types described by Boswell and Blanchard, one of pyrite derivation and the others from galena. The relative solubility of different limonite types in dilute HC1 was not found to be of as much value as some writers have indicated. The mineral deposits to which the limonite pointed the way have not been sufficiently exposed to allow detailed study, but the presence of tremolite and phlogopite in an area of disseminated mineralization indicates that this portion at least may be of contact metamorphic origin.

Organization: Government of Yukon | Gouvernement du Yukon
Post-glacial vegetation history of the Aishihik Basin and its vicinity, southwest Yukon Territory, Canada; a palynological perspective

Nine pollen profiles were obtained along a broad latitudinal transect extending from the Upper Nisling Valley to the Ittlemit Lake and Bear Lakes areas in the southwest Yukon Territory. Radiocarbon dated fossil pollen records from these profiles provided evidence for the reconstruction of postglacial environmental history of the area. Surficial samples combined to aid the interpretation of the fossil data. Records of these sequences suggest that the post-glacial vegetation in the area exhibited a successional development. Immediately after the deglaciation, the area was covered by a sparse herb dominated tundra assemblage. Betula glandulosa invaded the area at about 10,000 yr BP, which initiated the replacement of herbaceous tundra by a dwarf birch shrub-tundra. Picea glauca invaded the Upper Nisling Valley in the northern part of the study area and the Ittlemit Lake Basin in the south at least around 9,000 yr BP, while 8,600 yr BP in the central Aishihik Basin, marked the establishment of forest-tundra environment in the area. Significant rise of Picea pollen at 7,500-8,000 yr BP in the north-central part of the study area indicate the establishment of a modern boreal forest, which is approximately 1,500-2,000 years earlier than that indicated by the Antifreeze Pond pollen diagram from the Snag area of the southwest Yukon. It is notable that the pollen spectra of two lacustrine sediments suggest a phase change of lakes into marsh occurring around 5,000-6,000 yr BP in the area, and change of bog conditions has also been recorded at almost the same time in the area. These events occurred simultaneously in the area and probably reflect the change of climatic conditions, which might have led to the development of permafrost in the region. The development of early post-glacial vegetation in the area exhibited an unstable pattern. This instability was primarily related to the sequential invasion and migration of taxa from late-glacial refugia. Stable vegetation associations were established in the area as a result of migrators reaching their limit of climatic tolerance during the middle Holocene. Post-glacial vegetation history in the Ittlemit Lake Basin area seems to have exhibited a different pattern.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of the Jakes Corner Geophysical Survey Area, Southern Yukon (105C/12, 105D/8 and 9)

Interpretive geology of the Jakes Corner geophysical survey, southern Yukon, (NTS 105C/5 and 105D/8,9) including one 1:50,000-scale map and an interpretive report.

The accompanying geological map is designed to be overlain upon the 1:50,000 geophysical maps of Open File 1994-10(G). It incorporates published geological information which has been modified to accord with constraints provided by the geophysical data as well as from publicly available assessment reports and limited field checking. The map is highly interpretive, except for the eastern portions which benefit from mapping by Gordey and Stevens (1994b). Elsewhere, mapping concentrated on defining blocks with a uniform geophysical expression which could represent a particular rock unit. Sharp magnetic gradients between units are considered to represent faults, or where applicable, intrusive contacts. Structural relations between units are generally interpretive and may not be consistent throughout the map area. This report describes the rock units that occur in the survey area and elaborates on the mineral deposit types that might occur there.

Organization: Government of Yukon | Gouvernement du Yukon
The Fer property: A plutonic-related gold property in southeastern Yukon

The Fer gold property lies only 5 kilometres southwest of the Nahanni Range Road (Highway 10) in southeastern Yukon. It is underlain by a broadly folded sequence of coarse siliciclastic, calcareous and phyllitic, continental margin sedimentary rocks of the Neoproterozoic to Lower Cambrian Hyland Group. The extensive belt of Hyland Group rocks hosts gold mineralization in numerous occurrences from southeastern Yukon to the Dawson City area and is part of the Tintina gold belt.

The Fer property was originally staked in 1996 to cover the largest cluster of gold anomalies (>90th percentile for gold) in a regional fine-stream-sediment sampling program. Soil geochemistry on the property has outlined an area of about 2000 by 500 metres in the Southern Grid area with anomalous gold and arsenic values (>25 ppb Au, >125 ppm As). These values range up to 1870 ppb Au and 5430 ppm As. As well, a 500 by 200 metre Au-As anomaly is present in the Northeast Grid.

Mineralization is largely controlled by structure and host rock lithology, and is spatially associated with the most intense zones of silicification and quartz vein stockwork. Gold correlates best with As, Ag, Pb, and Sb. Values up to 2.3 g/t Au have been found in select rock samples in the mineralized areas. The Fer property mineralization likely represents a distal end-member of the plutonic-related gold deposits in the Tintina gold belt.

Organization: Government of Yukon | Gouvernement du Yukon
Pilot Scale Erosion Control Using Bioengineering Techniques at Gold Run Creek, 2005.

Disturbance of frozen ground, through placer mining activities, may lead to slope failure. A stockpile of frozen overburden has recently begun eroding from the formation of a runoff channel. A large cut, approximately 300 m long and up to 50 m deep has been created adjacent to Gold Run Creek, a heavily mined area southeast of Dawson City. 

This stockpiled overburden has been in place for several years and has revegetated with several species of mature willows (age dated to 15 years). Either due to heavy rainfall or climate change, melting has commenced in the stockpile resulting in the formation of a runoff channel. This has increased in size and slope failure continues to enlarge the cut. 

Laberge Environmental Services conducted a reconnaissance survey of the site in July 2003, to assess the site with the purpose of exploring ways of halting the slope failure and stabilizing the disturbed section of overburden. In the fall of 2005, several bioengineering structures were installed to assist in controlling the erosion. Retaining walls were installed on the side walls and the face of the cut, and a live willow flume was built to direct and reduce the velocity of the water entering the cut.

Organization: Government of Yukon | Gouvernement du Yukon
Geology at the contact between Yukon-Tanana and Cassiar terranes, southeast of Little Salmon Lake (105L/1), south-central Yukon

Paleozoic platformal and basinal strata of Cassiar Terrane are separated from rocks of Yukon-Tanana Terrane to the west by an unexposed fault in southeast Glenlyon map area. Quartzite, marble, phyllite, and amphibolite are grouped in Cassiar Terrane, and no rocks of Slide Mountain Terrane are recognized. The mid-Cretaceous Glenlyon batholith contains pendants of Cassiar Terrane and is intruded by at least five andesite dykes. West of the fault, the Yukon-Tanana Terrane includes: (1) mafic volcaniclastic rocks with preserved primary textures; (2) coarse-grained quartz-feldspar grit; and (3) metasiltstone and semi-pelitic schist. The grit is intruded by foliated hornblende granodiorite, likely of early Mississippian age. Small outcrops of tectonized serpentinite were tectonically emplaced into Yukon-Tanana Terrane, and a positive magnetic anomaly parallel to the fault suggests an unexposed extension to the southwest. Two mylonite localities and evidence of brittle cataclasis up to 1 km on either side of the presumed buried fault suggest a complex structural history along this terrane boundary.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary double-difference relocation earthquake catalogue for southwestern Yukon centred along the Denali fault zone

Southwestern Yukon is a seismically active zone of crustal deformation including multiple large, dextral strike-slip fault systems with overlapping activity. In this study, we perform double-difference relocation to the USGS earthquake catalogue for this region to produce a relocated catalogue of 5536 seismic events above magnitude 1.5 from 2010–2021. The relocated catalogue demonstrates better spatial resolution of linear features and the removal of grid location artifacts in depth. The relocated catalogue has smaller travel time residuals and smaller residual standard deviations showing that the new catalogue has improved absolute locations. From bootstrapping, we estimate the location uncertainties for the relocated events to be on the order of 1.2–2.4 km in the horizontal direction and 1.5–2.1 km in the vertical direction. From the relocated events, we interpret new faults including a fault connecting the Totschunda and Denali faults, a connector fault between the Totschunda-Duke River fault system and the Fairweather fault, and multiple smaller faults connecting the Fairweather and Denali faults. The significantly reduced uncertainty in depth also permits constraining the seismicity predominantly to the uppermost 10 km of the crust.

Organization: Government of Yukon | Gouvernement du Yukon
A Celebration of Swans posters

Every year, the Government of Yukon, with support from Yukon Energy, produces a collectible poster featuring an art piece celebrating spring and the arrival of swans. 

Posters are distributed across the Yukon to raise awareness about [A Celebration of Swans](https://yukon.ca/swans). This is annual festival takes place during the month of April at the Swan Haven Interpretive Centre.

Organization: Government of Yukon | Gouvernement du Yukon
The geology and ore deposits of the Howards Pass area, Yukon and Northwest Territories: The origin of basinal sedimentary stratiform sulphide deposits

A copy of this thesis is available at the EMR library – QE471 M67 1981.
This thesis is available online at https://open.library.ubc.ca/cIRcle/collections/ubctheses/831/items/1.0052838.

Organization: Government of Yukon | Gouvernement du Yukon
Selected excerpts from placer gold recovery research

The highest percentage gold recoveries occurred at mines which screened their feed to minus one inch, used both expanded metal and angle iron riffles on top of nomad matting for every sluice run and fed their runs at recommended feed and water rates. Expanded metal riffles are efficient at recovering placer gold particles finer than 1 mm while angle iron riffles are more efficient at recovering those greater than 1 mm. Slick plates allow gold particles to segregate to the bottom of the pay gravel slurry where they are more readily available for recovery by the riffles.

Additional field testing of existing placer operations should be conducted to expand the knowledge of gold recovery at a greater variety of deposit types and recovery equipment such as hydraulic riffles.

Organization: Government of Yukon | Gouvernement du Yukon
2014–15 Supplementary estimates no. 2

Supplementary estimates no. 2 for the Government of Yukon 2014–15 Budget. 
This document was prepared by the Department of Finance under the direction of Management Board for the 1st Session of the 33rd Legislature, Yukon Legislative Assembly. April 2015, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Multisensor airborne geophysical survey, Stewart River area, 115N, 115O, 116B (parts of)

Data were acquired during the second phase of an airborne geophysical survey (gamma ray spectrometer, magnetometer) carried out by Fugro. Funding was provided by Natural Resources Canada's Targeted Geoscience Initiative. The survey was completed between July 18 and September 28, 2001.

Organization: Government of Yukon | Gouvernement du Yukon
Geological map of the southern Campbell Range (NTS 105H/3 SW), southeastern Yukon

Schematic fold style, interpreted from fold geometry in outcrop and in thin section, rather than mapped structures. Jules Creek fault - possibly an Early Permian strikeslip fault (Murphy, 2004) reactivated with east-directed thrust motion in the Jurassic (Inconnuage). King Arctic Upper Quarry. Metasomatic replacement of chert granule to pebble conglomerate by tremolite is visible in outcrop over an interval of 5 m. The rocks across the contact from bottom to top are: serpentinite, nephrite, semi-nephrite, partly replaced conglomerate, and nonmetasomatized metaconglomerate. Nephrite formation resulted from metasomatic replacement of metasedimentary rocks (King Arctic formation green chert pebble conglomerate and lithic arenite and White Lake group Whitefish limestone) and/or serpentinite by serpentinite-derived fluids along D3 thrust faults interpreted to have Early Jurassic motion.

Organization: Government of Yukon | Gouvernement du Yukon
First vertical derivative of the magnetic field, Wernecke Mountain Aeromagnetic Survey, NTS 106C (south half), Yukon

This map of the first vertical derivative of the magnetic field was derived from data acquired during an aeromagnetic survey carried out by Fugro Airborne Surveys during the period April 17, 2006 to August 26, 2007. The data were recorded using a split-beam cesium vapour magnetometer (sensitivity = 0.005 nT) mounted in the tail boom of a Cessna Caravan aircraft. The nominal traverse and control line spacings were, respectively, 800 m and 2 600 m, and the aircraft flew at a nominal terrain clearance of 250 m. Traverse lines were oriented N30degreesE with orthogonal control lines. The flight path was recovered following post-flight differential corrections to the raw Global Positioning System data and inspection of ground images recorded by a vertically-mounted video camera. The survey was flown on a pre-determined flight surface to minimize differences in magnetic values at the intersections of control and traverse lines. These differences were computer-analysed to obtain a mutually levelled set of flight-line magnetic data. The levelled values were then interpolated to a 200 m grid. The International Geomagnetic Reference Field was not removed from the magnetic total field.

The first vertical derivative of the magnetic field is the rate of change of the magnetic field in the vertical direction. Computation of the first vertical derivative removes long-wavelength features of the magnetic field and significantly improves the resolution of closely spaced and superposed anomalies. A property of first vertical derivative maps is the coincidence of the zero-value contour with vertical contacts at high magnetic latitudes (Hood, 1965).

Organization: Government of Yukon | Gouvernement du Yukon
Physical and chemical zonation in the Emerald Lake Pluton, Yukon Territory

The Emerald Lake pluton, of the mid-Cretaceous Tombstone plutonic suite in Yukon is concentrically-zoned, and comprises four distinct mapped phases: augite syenite, hornblende quartz syenite, hornblende quartz monzonite, and biotite granite. U-Pb and Ar-Ar dates on major intrusive phases return statistically identical ages (93.1 Ma). The intrusion is also characterized by large miarolitic cavities distributed along the southern margin of the intrusion.

A copy of this thesis is available at the EMR library – QE195 D86 1999.
This thesis is available online at https://circle.ubc.ca/handle/2429/9367.

Organization: Government of Yukon | Gouvernement du Yukon
Hydrothermal alteration, mineralization and exploration potential of the Mars alkalic copper-gold-molybdenum porphyry occurrence, Laberge map area (105E/7), Yukon

The Mars property occurs on the southwestern margin of the Teslin Crossing pluton, a composite intrusion of intermediate, alkalic composition that was emplaced into sedimentary rocks of the Middle Jurassic Tanglefoot formation at about 175 Ma. Exposed alteration and mineralization define a northwest-trending zone 2.8 by 1.5 km. New field and petrographic data document a core zone dominated by sodic and magnetite-rich alteration, surrounded by more extensive calc-potassic alteration; each assemblage contains disseminated and fracture-hosted copper-gold mineralization. Subzones of younger quartz veins with strong copper-molybdenum±gold mineralization are widely distributed. Sericitic and propylitic alteration is minor and weakly mineralized. The system has low sulphide mineral content with a high ratio of chalcopyrite to pyrite. Hornfels in the Tanglefoot formation has stronger pyrite-pyrrhotite and also carries copper-gold mineralization. The Mars system is a silica-oversaturated alkalic copper-gold-molybdenum porphyry deposit with strong similarities to the Cadia and Goonumbla deposits in Australia.

Organization: Government of Yukon | Gouvernement du Yukon
Trace ammonium in granites of the southern Yukon and its petrogenetic significance

This reconnaissance study compares the ammonium content of some granites from the southern Yukon with granites in other regions. Analyses show a slight variation in ammonium content between individual intrusions, but there appears to be no correlation between NH4 content and granite type.

All analysed specimens showed low ammonium contents when compared with granites from other regions. This ammonium deficiency in the original magma is taken as evidence that magma was uncontaminated by sedimentary wall rocks at the level of emplacement.

Organization: Government of Yukon | Gouvernement du Yukon
Copper-gold ± silver mineralization at the Stu occurrence, central Yukon (Yukon MINFILE 115I 011)

The Stu copper-gold±silver occurrence (Yukon MINFILE 115I 011) is located midway between the Minto and Carmacks Copper deposits in the eastern, Minto suite portion of the Granite Mountain batholith. The best known mineralization at Stu is in Zone A, where at least four foliated and mineralized bodies strike northwest and dip moderately to steeply to the northeast. These bodies grade 0.2 to 0.6% total Cu, though the best historic diamond drill intersection contains 3.5% Cu over 13.5 m. In plan and cross section view, the foliated and mineralized granodioritic orthogneiss bodies pinch and swell, appearing as lenses surrounded by unfoliated K-feldspar porphyritic granodiorite. Copper mineralization occurs as both fine-grained hypogene bornite and chalcopyrite, and supergene malachite, azurite, tenorite and chrysocolla. This study suggests that Stu mineralization is similar to that at the Carmacks Copper and Minto deposits as it is primarily hosted in multiple, discrete bodies of foliated granodioritic rock. In terms of ore body orientation, the moderate to steeply dipping nature at Stu is more reminiscent of Carmacks Copper than Minto, which likely explains the presence of significant supergene copper mineralization.

Organization: Government of Yukon | Gouvernement du Yukon
Chieftain Hill property (Morning, Evening, Ocean), south Yukon

Chieftain Hill, near Skukum Creek gold deposit, is underlain by numerous spectacular orange, yellow and red goassans. Stibnite-quartz veins discovered on Chieftain Hill are small and were originally considered to be unrelated to the gossans but exploration in the mid-1980's led to the discovery of quartz-sulphide veins on the lower part of the hill, indicating that the gossanous alteration zones may be related to the mineralization.

Organization: Government of Yukon | Gouvernement du Yukon
Seismicity near the eastern Denali fault from temporary and long-term seismic recordings

We studied earthquakes near Burwash Landing, Yukon. Using data from temporary and permanent seismic stations, we enhanced the understanding of both regional and local earthquakes. The study used deep learning and template matching to effectively detect earthquakes, even from noisy data. Following detection, seismic parameters, earthquake location, and magnitude were estimated and refined. The analysis revealed 103 local earthquakes, with 28 located in an area of geothermal resource potential. Notable small-magnitude earthquakes were observed near Bock’s Creek fault. No earthquakes were observed on the Denali fault during the study period. The existence of active faults strike-parallel to the Denali fault suggests that local permeable structures may exist in the area. Regional observations detected 46 432 regional earthquakes in 13 years, but none along a section of the Denali fault near Burwash Landing, Yukon, which we interpret as a seismic gap.

Organization: Government of Yukon | Gouvernement du Yukon