AndreaBozzo/ceres-open-data-index huggingface dataset:
Are mafic dykes in the Nor and Hart River areas of the Yukon correlative to the Bonnet Plume River Intrusions? Constraints from geochemistry.

Samples of mafic to intermediate dikes were collected from the Nor and Hart River areas of the Yukon in regions underlain by metasedimentary rocks and breccia that have been correlated to Wernecke Supergroup and/or Wernecke Breccia. The samples were analysed for whole-rock and trace-element geochemistry and the results compared to those for intrusive suites in the northern Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of pyrite-sphalerite-galena concentrations in Proterozoic quartzite at Quartz Lake, southeastern Yukon

The Quartz Lake sedimentary hosted lead-zinc occurrence is 70 km northeast of Watson Lake. Proterozoic rocks of the area are divided into three groups of argillite, quartzite and limestone which are, in stratigraphic succession from oldest to youngest, the Range Group, the Mine Group and the Ridge Group. There are two principal lead-zinc occurrences in rocks of the Mine Group where pyrite, sphalerite and galena occur in tabular bodies, lenses and disseminations in a predominantly quartzite host rock.

Organization: Government of Yukon | Gouvernement du Yukon
Geophysical and borehole investigations of permafrost conditions associated with compromised infrastructure in Dawson and Ross River, Yukon.

The effects of permafrost degradation in Yukon have serious negative implications for the structural integrity of vertical infrastructure. This is especially pertinent for critical buildings such as hospitals, schools, etc., in small communities that are situated on top of warm, ice-rich permafrost. Projections of mean annual air temperature over the next few decades, based on regional climatic models, indicate that air temperature will rise, hastening the thaw of permafrost. The combination of rising of air temperatures and buildings situated on warm permafrost has prompted this investigation into the vulnerability of Yukon Government vertical infrastructure. The application of DC resistivity and ground penetrating radar in conjunction with borehole drilling indicates that in Dawson there is warm ice-rich permafrost beneath the Palace Grand Theatre; the Old Territorial Administration building is underlain by primarily unfrozen sediment; and permafrost under the St. Andrew’s Church is characterized by high variability. A deep active layer was observed at Ross River School and geophysical surveys indicate that warm water drainage from the roof is contributing to the thaw of the underlying permafrost.

Organization: Government of Yukon | Gouvernement du Yukon
Volcanic evidence for a compositional contrast in the lithospheric upper mantle across the Tintina Trench, southeastern Yukon, Canada

In the southeastern Yukon Territory, Quaternary continental alkaline basalts have erupted across an important crustal suture, the Tintina Trench, which separates the accreted terranes of the Canadian Cordillera from the ancestral North American craton. The lavas from the Rancheria region from the west side of the Tintina Trench are basanites (BASAN), alkaline olivine basalts (AOB), and hypersthene-normative basalts (HYN). They display fractionated rare earth element (REE) profiles and are enriched in light rare earth elements (LREE) and high field strength elements (HFSE). The compositional spectra of the Rancheria alkaline magmas appears to represent the progressive melting of an amphibole-bearing garnet lherzolite. The involvement of amphibole in the petrogenesis of the Rancheria alkaline magmas indicates that these magmas were generated within the lithosphere. At the eastern end of the Rancheria suite, on the east side of the Tintina Trench, the AOB from Watson Lake have higher Zr contents than Rancheria AOB to the west of the Trench. The high Zr contents of the Watson Lake AOB are similar to those observed in the Hoole Eocene tholeiitic basalts, on the east side of the Tintina Trench, further to the north. The Eocene basalts from the Hoole River region are olivine tholeiites which have experienced closed-system crystal fractionation of olivine at low pressure. The estimated primary magma for these Eocene basalts appears to have been derived by partial melting of an incompatible-element enriched lithospheric mantle source, during which garnet was not a residual phase. The Nb-Zr systematics of the Watson Lake basalts indicate that they may be derived by mixing between melts produced by melting of an amphibole-bearing residue and a lithospheric mantle similar in composition to that of the Hoole basalts. Therefore, these compositional differences in the alkaline basalts across the Tintina Trench appear to reflect the juxtaposition of chemically distinct continental lithospheric mantles, indicating that the Tintina Fault is a steep lithospheric suture.

Organization: Government of Yukon | Gouvernement du Yukon
Surficial geology, Dawson Region, Yukon, parts of NTS 115O/14 & 15 and 116B/1, 2, 3, & 4

Local-scale surficial geology mapping was completed as part of a community hazards mapping program coordinated by the Northern Climate ExChange (Yukon Research Centre, Yukon College). This program assesses potential landscape hazards under changing future conditions by incorporating a variety of data sets, including surficial geology, topography (slope and aspect), permafrost distribution, site-specific permafrost data (e.g. ground penetrating radar, electrical resistivity tomography and borehole data), analyses of past hydrological and climatological trends, and future climate projections. The surficial geology map describes surface landscape features, sediment texture, genetic material, surface expression and geomorphological processes. Detailed descriptions of local surficial geology and hazard analysis methodology are presented in the accompanying report. The accompanying landscape hazard classification map identifies existing and potential geological hazards such as landslides, permafrost stability and flooding; the hazard map is presented in stoplight colours to provide an intuitive tool for community decision makers aiming to incorporate an adaptation planning framework into existing land use management practices.

Organization: Government of Yukon | Gouvernement du Yukon
The Tsa da Glisza (Regal Ridge) emerald occurrence, Finlayson Lake district (NTS 105G/7), Yukon: New results and implications for continued regional exploration

Emerald at the Tsa da Glisza property in southeast Yukon is associated with abundant quartztourmaline veins within chromium-rich mafic metavolcanic rocks. A genetic model for the emerald mineralization has been formulated: vein fluids were mixtures of fluids from both magmatic and metamorphic sources. Beryllium derived from an adjacent Cretaceous granite pluton travelled as both hydroxide and fluoride complexes within dominantly magmatic fluids. Emerald crystallized during cooling, after the magmatic fluids mixed with hydrothermal fluids that had scavenged chromium from the surrounding mafic schist. Property-scale exploration targets the permeable, highchromium mafic schists as potential hosts (rather than nearby chromium-rich, but impermeable, serpentinized ultramafic rocks). Soil geochemistry, drilling and prospecting are used to locate emerald mineralization. Based on the genetic model, further exploration in the Finlayson Lake region should focus on areas where permeable, high-chromium host rock (schist, rather than serpentinized ultramafic) is in close proximity to evolved felsic intrusive rocks.

Organization: Government of Yukon | Gouvernement du Yukon
Upper Fifteenmile Group in the Ogilvie Mountains and correlations of early Neoproterozoic strata in the northern Cordillera

An ~2-km-thick stratigraphic section measured through three consecutive shale-carbonate sequences documents the previously undescribed upper Fifteenmile Group in the Coal Creek inlier. These descriptions provide the basis for correlation with Proterozoic strata of adjacent inliers in eastern Alaska, as well as in the eastern Ogilvie Mountains.
The lowest unit contains interbedded limestone and mudstone with distinctive maroon-weathering layers. Similar strata are present in unit D of the Pinguicula Group exposed in the Hart River inlier. In that area however, the middle sequence containing massive dolostone, that is the most prominent unit of the upper Fifteenmile Group, is missing beneath an angular unconformity. The Callison Lake dolostone is above this surface and is lithologically indistinguishable from the uppermost, stromatolitic carbonate of the upper Fifteenmile Group. Both the middle and upper dolostone units are preceded by black shale, indicating abrupt transgressions. In contrast, the carbonate units contain abundant evidence of shallow water and periodic emergence. We interpret the upper Fifteenmile Group to comprise three shallowing-upward cycles in this area.

Organization: Government of Yukon | Gouvernement du Yukon
Crustal depth of emplacement of the Early Jurassic Aishihik and Tatchun batholiths, west-central Yukon

Early Jurassic plutons in west-central Yukon were emplaced during accretion of the Intermontane terranes onto the western North American margin, and their exhumation is recorded in the sedimentological and geochronological record. Here the aluminum-in-hornblende geothermobarometer is applied to the 200-197 Ma Tatchun batholith and the 188-180 Ma Aishihik batholith, to estimate crystallization depths and exhumation rates. The Tatchun batholith crystallized at 6.4-7.2 kbar (23-26 km), whereas the Aishihik batholith was emplaced at 3.4-4.2 kbar (12-15 km). The Tatchun batholith exhumed at a rate of ~1.2-2.0 mm/a after crystallization, and was likely exposed at surface by the Middle Jurassic. Although subvolcanic equivalents of the Tatchun batholith have been lost to erosion, it could be prospective for deformed copper deposits such as Minto and Carmacks Copper. Hypabyssal and water-saturated phases of the Aishihik batholith suggest that portions of the batholith could be at, or just below, an appropriate crustal level for magmatic-hydrothermal mineralization.

Organization: Government of Yukon | Gouvernement du Yukon
Regional stream sediment geochemical data, Glenlyon area, central Yukon (NTS 105K & L)

This data package contains results for parts of the Glenlyon survey area (NTS 105K west and 105L). This information has been provided in a variety of digital formats. PDF files include survey descriptions and details regarding methods, analytical data listings and summary statistics. Raw digital data of original field and analytical information plus new reanalysis results are included in Microsoft®Excel (XLS) format.

NGR surveys were originally conducted in the Glenlyon map area in 1988 and covered parts of NTS map sheets 105K and L (Friske and Hornbrook, 1989). Stream sediment and water samples were collected from a total of 1378 sample sites. The work was undertaken by the GSC in conjunction with the Department of Indian Affairs and Northern Development, and the Government of Yukon under the Canada-Yukon Mineral Development Agreement (1985-1989).

As part of the 2011 Yukon Database Upgrade Project, original material collected from 1096 sample sites were selected for reanalysis. In 2014, material from the remaining 282 samples sites was selected for reanalysis. Representative 2 gram splits were successfully recovered from a total of 1460 samples. Due to a deficiency of available material, 1 sample was not recovered. The samples were delivered to Bureau Veritas Commodities Canada Ltd. (Vancouver) and were analyzed by an ultra-trace aqua-regia digestion ICP-MS package for 53 elements.

Organization: Government of Yukon | Gouvernement du Yukon
The Whitehorse Copper Belt: Mining, Exploration & Geology 1967 - 1980

This report on the Whitehorse Copper Belt is written by a geologist who was actively involved in mining and exploration in the district during the decade of the seventies. It includes a review of earlier data and compiles recent work, mining practice, geological concepts and constraints and problems in development and mining. Earlier reports on the district by McConnell and Kindle emphsized geology; this report concentrates on mining and development. The report was written when mining in the district was at its peak; it will be useful to those contemplating future development in the Copper Belt and for comparing the district to others. Mining in the Copper Belt may cease soon and the report was solicited by D.I.A.N.D. from Whitehorse Copper Mines as a record of mining practice and geological concepts.

Organization: Government of Yukon | Gouvernement du Yukon
Aeromagnetic Total Field, Yukon Territory/Northwest Territories, 116P/SW-SE

This map was compiled from data obtained as a result of an aeromagnetic survey carried out by Goldak Airborne Surveys using two Piper Navajo aircraft.The survey operations were carried out from July 18 to September 2, 2003. 
A 0.005 nT sensitivity split-beam cesium vapour magnetometer was mounted in the tail boom of each survey aircraft. 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
2007–08 Supplementary estimates no. 1

Supplementary estimates no. 1 for the Government of Yukon 2007–08 Budget. 
This document was prepared by the Department of Finance under the direction of Management Board for the 1st Session of the 32nd Legislature, Yukon Legislative Assembly. October 2007, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Climatic conditions in the western and northern Cordillera during the last glaciation; paleoecological evidence

In the southern Cordillera, paleoecological evidence suggests that climate was variable, from cooler than present by up to 3°C, to possibly similar to modern during the Olympia non-glacial interval (> 59 TO 25-29 ka). The development of open subalpine parkland vegetation in lowlands after 25 ka reflects slow cooling to glacial conditions. Assumptions about continuously cold and dry glacial conditions are tested and disputed. Between 18-19 ka, pollen, plant macrofossil and beetle evidence suggest relatively warm and moist conditions in the Fraser/Puget Lowlands. A tentative correlation can be inferred with the recently defined "Hanging Lake thermal event" around 18-22 ka in the unglaciated Yukon. Further work should be done to test this inference. Paleobotanical data suggest that increasing moisture, rather than increased cooling, was responsible for the late Vashon ice advance in the southwestern Cordillera. The controversy regarding the nature of the vegetation cover in eastern Beringia, north of the main Cordilleran ice sheet, is not yet settled, although evidence to date favours a complex mosaic of tundra and "steppe-tundra" plant communities supporting a greater diversity of grazing large mammals than exist in the area today.

Organization: Government of Yukon | Gouvernement du Yukon
Geological overview of Clear Creek map area (NTS 115P/14), western Selwyn Basin

Clear Creek map area of central Yukon is underlain by deformed and metamorphosed Proterozoic and Paleozoic rocks of western Selwyn Basin (Hyland Group, unnamed carbonate unit, Road River and Earn groups) and mid-Cretaceous felsic intrusions. Metasedimentary rocks are disposed in a warped northwest to northeast-dipping structural panel with younger, structurally shallow rocks in the north and older, structurally deeper rocks in the south. Younger rocks in the north are deformed into Lost Horses syncline, a southwest-overturned tight to isoclinal syncline with an axial surface trace extending across the northern part of the area. Older rocks at deeper structural levels in the south are deformed by a suite of fabric elements that probably post-date Lost Horses syncline, indicate a top-to-the-northwest sense of tectonic transport, and are probably related to Early Cretaceous displacement on the Tombstone thrust. Subsequent deformation warped the panel into its current orientation. All structures are intruded by mid-Cretaceous felsic intrusions including hornblende-biotite (rare muscovite) granite, quartz monzonite, granodiorite, syenite, and quartz syenite. Mineral occurrences are mainly precious metal, tin, and/or tungsten bearing vein, skarn, and breccias associated with felsic intrusions. Bedded barite occurs in Earn Group strata. New analyses of mineralized samples confirm earlier data reporting significant gold values in veins cutting felsic intrusions and nearby country rock, and correlation of anomalous gold with anomalous bismuth in some veins.

Organization: Government of Yukon | Gouvernement du Yukon
Very Fine Stream Sediment Sampling for Gold

In theory, very fine sediment sampling (<53 microns) has the potential to improve the usefulness of stream sediment data for gold. The key theoretical advantages over traditional techniques are less local sample site variation, improved reproducibility, and the potential to preferentially define anomalies associated with significant bedrock mineralization. An orientation survey is required to test the actual effectiveness of these techniques and to establish practical sampling and processing procedures.

Organization: Government of Yukon | Gouvernement du Yukon
Field investigations of the Upper Devonian to Lower Carboniferous Tuttle Formation, eastern Richardson Mountains, Yukon.

The Upper Devonian to Lower Carboniferous Tuttle Formation was an exploration target for oil and gas in the Peel Plateau and Eagle Plain in the 1960s and 1970s. To date, seven minor gas shows have been identified in the Tuttle Formation in the Peel region. This study is part of a long-term project to investigate the sedimentology, stratigraphy and hydrocarbon potential of this unit in the Peel region.
The Tuttle Formation forms the upper part of a siliciclastic wedge that was deposited in the foreland basin of the Yukon and Ellesmerian fold belts. In the eastern Richardson Mountains, on Trail and Road rivers, it occurs as alternating packages of resistant and recessive intervals. Resistant intervals, 23 to 54 m thick, comprise five lithofacies including fining-upward sandstone, massive sandstone, siltstone, conglomerate and diamictite. Recessive intervals, 55 and 144 m thick, consist of siltstone and shale and are mostly covered.

Organization: Government of Yukon | Gouvernement du Yukon
Placer depositional settings and their ages along Dominion Creek, Klondike area, Yukon

Dominion Creek and its tributaries (Sulphur and Gold Run creeks) are one of the largest placer gold producing areas in North America. The placer gravel is divided into: (1) Pliocene White Channel gravel, (2) Pleistocene terraces, (3) early Pleistocene incised-valley gravel (Ross gravel), (4) Pleistocene Dominion Creek gravel, and (5) creek and gulch deposits.

Paleomagnetically, the White Channel gravel is normally magnetized at one site, suggesting a pre-Brunhes normal chron (likely recording the Gauss chron, or an earlier sub-chron older than 2.6 million years). These results are broadly similar to those paleomagnetic investigations of the White Channel gravel in the Klondike River drainage. The Ross gravel is magnetically reversed and may be correlated to the Matuyama reversed chron (older than 780,000 years). Furthermore, the Ross gravel has a younger normally magnetized alteration overprint presumably of Brunhes age (younger than 780,000 years). Dominion Creek gravel overlies the Ross gravel in lower Dominion, Sulphur and Gold Run creeks, and at all sites sampled revealed normal polarity, presumably of Brunhes age (younger than 780,000 years). Radiocarbon ages from the Dominion Creek gravel range from older than 47,000 years BP to 6000 years BP, and likely represent a composite unit of fluvial activity over the last several hundred thousand years.

The oldest and volumetrically largest placer deposits are associated with the Ross gravel, and little gold appears to have been subsequently mobilized from bedrock sources during the last 800,000 years. Gold within Dominion Creek deposits is largely flat, rounded and well travelled,suggesting the main source was likely near King Solomon Dome in the headwaters of the basin.

Organization: Government of Yukon | Gouvernement du Yukon
Geology and jade prospects of the northern St. Cyr klippe (NTS 105F/6), Yukon

Nephritic jade deposits have been found along faulted contacts between serpentinite and siliceous units at the King Arctic mine in southeastern Yukon. In the St. Cyr klippe near Quiet Lake south-central Yukon, serpentinite units of the Slide Mountain oceanic assemblage are thrust above phyllite units of the Cassiar terrane. This contact has the potential to contain jade deposits similar to the ones found at the King Arctic mine. However, bedrock mapping during the summer of 2013 failed to identify large jade deposits within the field area, but smaller jade deposits may have been overlooked. The absence of jade mineralization could be due to the lack of fluid migration through faults, but is more likely due to the low silica content of the phyllite.

Organization: Government of Yukon | Gouvernement du Yukon
Regional stream sediment geochemical data, Lake Laberge area, southern Yukon (NTS 105E)

This data package contains results for parts of the Lake Laberge survey area (NTS 105E). This information has been provided in a variety of digital formats. PDF files include survey descriptions and details regarding methods, analytical data listings and summary statistics. Raw digital data of original field and analytical information plus new reanalysis results are included in Microsoft®Excel (XLS) format.

NGR surveys were originally conducted in the Lake Laberge map area in 1988 and covered parts of NTS map sheet 105E (Hornbrook and Friske, 1989). Stream sediment and water samples were collected from a total of 877 sample sites. The work was undertaken by the Geological Survey of Canada in conjunction with the Department of Indian Affairs and Northern Development, and the Government of Yukon under the Canada –Yukon Mineral Development Agreement (1985 - 1989). 

As part of the 2014 Yukon Database Upgrade Project, original material collected from the 908 sample sites were selected for reanalysis. Representative 2 gram splits were successfully recovered from a total of 962 samples. The samples were delivered to Bureau Veritas Commodities Canada Ltd. (Vancouver) and were analyzed by an ultra-trace aqua-regia digestion ICP-MS package for 53 elements.

Organization: Government of Yukon | Gouvernement du Yukon