AndreaBozzo/ceres-open-data-index huggingface dataset:
Pre-Reid surficial geology investigations in southwest McQuesten map area (115P)

Recent field investigations have improved our knowledge of the Quaternary surficial geology, stratigraphy and glacial limits in the McQuesten map area. This information has important applications to surficial geochemical and placer exploration. The Quaternary geology of this area is unique because it encompasses early to middle Pleistocene (pre-Reid) glacial surfaces that are preserved beyond the limit of the Illinoian (Reid) glacial limit. These pre-Reid surfaces have been exposed to long periods of weathering and erosion, which have diminished their original distribution and expression. Stratigraphic exposures examined in the map area provide new evidence for a large glacial lake(s) in the Lake Creek basin (‘glacial lake Coldspring’); the lake developed when pre-Reid ice dammed outlets in the Willow Hills and lower Lake Creek. In addition, there is evidence that another large glacial lake (‘glacial lake Rosebud’) formed on the west side of the White Mountains when a pre-Reid glacier dammed Rosebud Creek. Fieldwork in the White Mountains and on Australia Mountain allowed us to delineate the pre-Reid glacial limit at approximately 1000 m (3300-3400 ft) a.s.l. This elevation is lower than the pre-Reid glacial limit previously mapped for the area by Duk-Rodkin (1999) and is consistent with mapping performed in the adjacent Stewart River map sheet by Bostock (1964), Jackson (2005a,b) and Froese and Jackson (2005).

Organization: Government of Yukon | Gouvernement du Yukon
Minor elements in sphalerite from carbonate-hosted zinc-lead deposits, Yukon Territory and adjacent District of Mackenzie, Northwest Territories

Minor element concentrations in sphalerite from carbonate-hosted zinc-lead deposits in the Northern Cordillera have been determined to define the metallogeny of this remote region. Concentrations of Ag, Cd, Co, Cu, Fe, Mn, Ni, Pb and Hg, were analyzed in 166 specimens from 48 deposits; an additional 13 elements were investigated at a qualitative level. Analytical data is reported here. Analyses of variance indicate that minor element variations within single hand specimens, and analytical variations, are insignificant relative to between deposit variations. Furthermore, within deposit variations are small relative to between deposit variations; therefore, each deposit can be characterized by the minor elements in the sphalerite.

Probability graph analysis of all minor element contents define bi-modal distributions consisting of relatively 'high' and 'low' populations for most elements. Proterozoic and Lower Cambrain rocks host sphalerite 'high' in minor elements. Sphalerite 'low' in minor elements occurs mainly in Ordovician to Devonian hosts. These patterns are explained best by two ages of regional metallogeny, possibly reflecting two different mineralizing processes. A major shale basin, dewatering to produce metal-rich brines, is associated only with the younger hosts. Major unconformities and paleophysiography suggestive of karst environments are associated with the older host rocks. A model of two metallogenic events, one during Middle to Late Cambrian and another during late Devonian or later is proposed.

Organization: Government of Yukon | Gouvernement du Yukon
Structural settings and geochemistry of the Myschka gold prospect, Tintina Gold Belt, Mt. Selous area (105K/16, 105N/1), Yukon

The Myschka property overlies a large mineralized area within and adjacent to a 1200 m by 600 m Cretaceous Tombstone Suite granodioritic intrusion. Mineralization is controlled by at least four wide east-west-trending lensoid zones of faulting, brecciation and hydrothermal alteration. Just north of the intrusion, the zones were followed for a distance of 1500 m; widths of individual zones vary from 20 to 100 m. The zones tend to coalesce into much wider (up to 200 m) brecciated packages that dip steeply (70-85°) to the south and apparently crosscut the intrusive. A network of northerly dipping fault and alteration zones crosscut these breccias.
The breccias include intensive quartz stockwork and thicker quartz-filled shear zones containing disseminated gold-bearing sulphide (pyrite, arsenopyrite) mineralization. Rock samples returned numerous strongly anomalous gold values ranging from 200 ppb to 1.05 g/t throughout the extent of the breccia zones. Larger quartz veins locally exhibit much stronger sulphide enrichment, resulting in higher Ag, Bi, Sb, Pb, Zn and Cu values influencing property-scale geochemical zonation. A distinctive gold and pathfinder element soil anomaly is coincident with the breccia packages.
During the 2002 exploration program, the prospect was advanced to drill-ready stage. Proposed drilling will test subsurface continuation of gold-bearing fault/breccia and alteration zones into the intrusive rock.

Organization: Government of Yukon | Gouvernement du Yukon
Geology, Petrology and Geochronology of the Late Cretaceous Klaza Epithermal Deposit: A Window into the Petrogenesis of an Emerging Porphyry Belt in the Dawson Range, Yukon, Canada

Geologic understanding of the richly mineralized Dawson Range gold belt (DRGB) in the central Yukon, Canada is hindered by: (1) limited outcrop exposure due to thick soil cover; and (2) low resolution age-constraints despite a long history of porphyry Cu–Au–Mo deposit (PCD) exploration. Here, the well-preserved Klaza Au–Ag–Pb–Zn porphyry–epithermal deposit is used as a type-example of Late Cretaceous magmatic–hydrothermal mineralization to address the complex metallogeny of the DRGB. U–Pb zircon dating defines four magmatic pulses of Late Triassic to Late Cretaceous ages with the latter consisting of the Casino (80–72 Ma) and Prospector Mt. (72–65 Ma) suites. The Casino suite has five phases of intermediate-to-felsic calc-alkaline composition, correspond with older (77 Ma) porphyry mineralization, and displays evidence of magma mingling. The intermediate-to-mafic, slightly alkalic Prospector Mt. suite shows evidence of mingling with the youngest Casino suite phases, correlates with younger (71 Ma), intermediate-sulfidation epithermal and porphyry-type mineralization, and shoshonitic basalts of the Carmacks Group. Zircon trace element data suggest a common melt source for these suites; however, the younger suite records features (e.g., high La/Yb) that indicate a higher pressure melt source. The results from this study highlight the Prospector Mt. suite as a historically overlooked causative magma event linked to Au-rich PCDs in the DRGB and extends the temporal window of PCD prospectivity in this area. The transition from mid-Cretaceous Whitehorse suite magmas to Late Cretaceous Casino-Prospector Mt. suite magmas is proposed to reflect a transition from subduction to localized extension, which is becoming more recognized as a common characteristic of productive porphyry belts globally.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary geology of the Pool Creek map area (95C/5), southeastern Yukon

Fieldwork in the northwest corner of Pool Creek map area (NTS 95C/5) during the summer of 2000 distinguished North and South areas with distinct stratigraphies and deformation histories. The South area is underlain mainly by siliciclastic sedimentary rocks (1100 m total thickness in three units) of uncertain age (Proterozoic?). North area stratigraphy (1800 m total thickness in seven units) ranges in age from Ordovician to Mississippian and consists of an interbedded succession of carbonates,sandstones, siltstones,and shales.Major shale units in the succession are correlated with Road River and Earn groups.

Strata in both areas have been intruded by a north-trending, unfoliated, Eocene (?) syenite. The syenite has a thin contact metamorphic aureole consisting of skarn, gossan, and biotite hornfels. Deformation in the South area is characterized by broad, northeast-trending, subhorizontal folds, which are likely coeval with syenite intrusion. Units in the North area are deformed into tight, overturned, north-plunging, east-verging folds with a well developed, axial planar, slaty cleavage in the hinge zones. North area deformation probably predates syenite intrusion. Our fieldwork confirmed previously reported U-Th-REE prospects associated with the syenite and favourable stratigraphy for
sedimentary-exhalative targets in the North area.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary investigation into the geologic relationships in the Granite Lake area, parts of NTS 115A/10, 11, 14, and 15, southwest Yukon

Bedrock mapping, during the summer of 2013, within the Granite Lake area was completed as part of the first year of a multi-year project to investigate the geological relationships in southwest Yukon. Several different tectonostratigraphic elements were identified including rocks of the Yukon-Tanana terrane, the Kluane schist, and the Bear Creek assemblage. These were tectonically juxtaposed into a northeast dipping structural stack with the Yukon-Tanana terrane occupying the highest structural level, followed by the Kluane schist and the Bear Creek assemblage. Two plutonic phases of probable mid-Cretaceous and Late Cretaceous age were identified to intrude the Kluane schist and the Yukon-Tanana terrane respectively. A large Paleocene aged batholithic intrusive suite, the Ruby Range suite, intrudes across all tectonic boundaries.Tectonic and stratigraphic relationships observed in southwest Yukon are strikingly similar to those found in southeast Alaska, near Juneau. These similarities increase the potential for Juneau gold-belt type mineralizing systems extending into southwest Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of the McQuesten River Region, Northern McQuesten and Mayo Map Areas, Yukon Territory (115P/14, 15, 16; 105M/13, 14)

The McQuesten River region in the northern part of the McQuesten and Mayo map areas (scale 1:250 000) is underlain by Upper Proterozoic to Mississippian rocks that were deposited in an offshelf setting during the formation of the northern Cordilleran continental margin, deformed during the Mesozoic, and intruded by pre and post-kinematic intrusions. The Selwyn Basin phase of evolution of the continental margin is represented by rock units that correlate with units defined in the eastern part of Selwyn Basin. Dark clastic and rare felsic metavolcanic rocks of the Deconian-Mississippian Earn Group unconformably overlie rocks of the Selwyn Basin phase and are overlain conformably by the Mississippian Keno Hill quartzite. Dark, fine-grained metaclastic rocks of unknown age locally overlie Keno Hill quartzite.
Four episodes of plutonism can be distinguished in the area, the earliest probably Early Paleozoic in age, another mid-Triassic in age, and two phases of Cretaceous granitic magmatism. Early Paleozoic bodies are typically metre-scale, fine-grained diabasic dikes and sills intruding rocks of the Hyland Group. Mid-Triassic diorite to gabbro occurs in discontinuous pods of various sizes, primarily in the Tombstone Thrust sheet where they intrude Devonian and Mississippian rocks. The most voluminous and widespread granitic rocks are the early Late Cretaceous Tombstone intrusions (92 ± 2 Ma). Typical Tombstone intrusions are weakly porphyritic, medium-grained hornblende-biotite granite to granodiorite, but they range from syenite to granodiorite and are locally peraluminous. The latest episode of granitic magmatism, the 65 ± 3 Ma McQuesten intrustions, is not yet fully delineated but includes five stocks of peroluminous potassium feldspar megocrystic granite.
Paleozoic and Mesozoic structures occur in the region. The Sprague Creek Fault, a pre-Late Cambrian normal fault, is inferred from stratigraphic relationships. A possibly Jurassic phase of shortening is represented by west-northwest-trending, south-vergent folds that pre-date Jura-Cretaceous structures. The most pervasive and important phase of deformation is Jura-Cretaceous in age and kinematically complex. The Robert Service and Tombstone thrusts and Tombstone Strain Zone formed between the Late Jurassic and early Late Cretaceous during northward and northwestward displacement of more southerly hanging wall rocks.
The McQuesten River region has numerous mineral occurrences, a long history of mining and mineral exploration and good potential for further discoveries.

Organization: Government of Yukon | Gouvernement du Yukon
Petrology and geochemistry of tin and tungsten mineralized plutons, McQuesten River Region, Central Yukon

Mid-Cretaceous plutons in the McQuesten River region intrude Upper Proterozoic to Mississippian miogeoclinal metasedimentary rocks of Selwyn Basin. They form a belt trending east from the Tintina Trench which can be roughly subdivided into two parallel belts. Plutonic rocks fall into three main groups: 1) biotite-muscovite (two-mica) granite in the southernmost belt which follows the trend of the McQuesten Anticline; 2) biotite-hornblende quartz monzonite, granite and granodiorite in the northern belt which follows the thrust faulted contact of the Hyland Group (Grit Unit) with the Road River Formation; and 3) hornblende-biotite syenite and associated quartz syenite, quartz monzonite, granite and tourmaline-orbicular granite along the north edge of the northern belt.

Tin-silver breccia veins and skarns are spatially associated with the two-mica granites, while tungsten-gold skarns and sheeted veins are associated with biotite-hornblende granite, quartz monzonite and granodiorite. The concentrically zoned syenite intrusion in the northern belt (ZETA) includes all the plutonic phases (two-mica granite, biotite-hornblende granitoids, and hornblende-biotite syenitoids), and links them cogenetically through the fractional crystallization process. The ZETA tin-silver veins are associated with the tourmaline orbicular granite, which is the most evolved phase of the concentrically zoned ZETA syenite intrusion.

Plutons in the McQuesten region resemble those of the Selwyn and Tombstone Plutonic Suites. They are post to syntectonic, roughly circular in shape, and intrude miogeoclinal metasedimentary rocks of ancient North America. They show a concentric zonation and are surrounded by contact aureoles. The intrusive suite is bimodal, with a southern belt consisting of evolved two-mica granites and a northern belt consisting of less evolved biotite-hornblende granites. Lavas associated with the plutons are believed to be coeval.

Organization: Government of Yukon | Gouvernement du Yukon
New geochronological and geochemical data for Permian rocks of the western Yukon-Tanana terrane, Klondike district, Yukon

New U-Pb zircon dates from Permian rocks of the Yukon-Tanana terrane in the Klondike district of western Yukon provide new constraints on timing of intrusions and deposition. The new data shows that significant Pb-loss affected zircon in metamorphic rocks of the Yukon-Tanana terrane. The new, high-precision CA-TIMS dating shows that all intrusions in the region are ca. 261 Ma and eliminate previous constraints on the Klondike orogeny. A review of lithogeochemical data and new Lu-Hf isotope data for zircon support development of the Klondike assemblage in back-arc to continental arc settings. New 40Ar/39Ar data for Permian metaplutonic rocks indicates cooling below 300-350°C in the Early Jurassic.

Organization: Government of Yukon | Gouvernement du Yukon
Census 2011 (Semi-custom Profile of Yukon Territory and Selected Regions)

Datasource: Statistics Canada. 2012. Census Profile - Age, Sex, Marital Status, Families, Households, Dwellings and Language for Canada, Provinces, Territories, Census Divisions and Census Subdivisions, 2011 Census. Statistics Canada Catalogue http://www12.statcan.gc.ca/census-recensement/2011/dp-pd/prof/details/page.cfm?Lang=E&Geo1=CD&Code1=6001&Geo2=PR&Code2=01&Data=Count&SearchText=Yukon&SearchType=Begins&SearchPR=01&B1=All&GeoLevel=PR&GeoCode=6001&TABID=1 98-314-XCB2011006 Ottawa. Accessed November 23, 2012. 

Statistics Canada. 2012. 2011 Semi-custom Profile of Yukon Territory and Selected Regions, 2011 Census. CRO0130687_SP.1. Ottawa. November 20, 2012.

Footnotes: A value of 0 in any given cell represents one of the following: 1) value is actually zero; 2) value may be random rounded to zero; or 3) value is more than zero but is suppressed for confidentiality reasons. Private household size and private household type are based on . 

Values have been subjected to a confidentiality procedure known as random rounding.

For Statistics Canada's definition of terms, http://www12.statcan.ca/english/census06/reference/dictionary/atoz.cfm.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Exploration and Geology 2001

Yukon Exploration and Geology (YEG) is the main publication of the Yukon Geology Program (Indian and Northern Affairs Canada and Yukon Government). This is the 24th volume of the YEG series. It 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 who are willing to collectively benefit the Yukon's mineral industry.

The 2001 volume has four parts. The fi rst - Mineral Industry - includes overviews of Mining and Exploration in the Territory. The second part - Government - outlines the activities and organization of the Yukon Geology Program. This section also includes updates on the Mineral Resource Assessments, the Yukon Mining Incentives Program, and announcements of the third Mining Land Use Reclamation Awards, the Robert E. Leckie Awards. The third part - Geological Fieldwork - contains reports describing regional mapping, and more detailed geological, geochemical, geophysical, geochronological, paleontological, paleomagnetic and placer deposit studies. The last part - Property Descriptions - is a collection of geological reports of mineral occurrences with recent exploration advances or detailed studies, and is authored by industry and government geologists, as well as university students.

Organization: Government of Yukon | Gouvernement du Yukon
Exploring Keno Hill - Stories of a Silver Deposit

Nestled in the mountains in central Yukon, the Keno Hill area was once host to one of the world's richest silver deposits. The many tracks and trails, no longer used for mining, are here now for experienced hikers, mountain bikers and winter sports enthusiasts. High (1,848 m) and exposed, the top of Keno Hill stayed above the glaciers in the last ice age. Descendants of plants and insects (including butterflies) that were here during the ice ages remain in the meadows. Visit in late spring or early summer and take advantage of the long hours of sunlight to hike late into the evening. Listen for the birds singing after the sun disappears

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary results from a diamond drill hole study to assess shale gas potential of Devonian strata, Eagle Plain, Yukon.

An evaluation of hydrocarbon resource potential in Eagle Plain is one aspect of the Yukon Sedimentary Basins Project, a five-year (2008-2013), collaborative Geo-Mapping for Energy and Minerals (GEM) Program of the Geological Survey of Canada (GSC), in partnership with the territorial governments and universities. As part of this project, Yukon Geological Survey (YGS) and Northern Cross (Yukon) Limited (NCY) are collaborating with the GSC to assess shale gas potential of Devonian shale at Eagle Plain.

Diamond drill core was retrieved from mineral exploration properties to evaluate shale gas potential of Devonian shale of Road River Group and Canol and Imperial formations. Diamond drill core from four holes, located on the Rich property east of Eagle Plain Hotel, were examined and sampled. The core was systematically sampled and analysed by Rock-Eval pyrolysis, optical microscopy, X-ray diffraction (XRD) mineralogy, and palynology.

The results indicate that the succession is thermally overmature with respect to hydrocarbon generation. Due to the high levels of thermal maturity, the Rock-Eval data are unreliable. However, high amounts of residual organic carbon suggest that the Canol Formation has the potential to be an important source rock in the region, under favourable burial conditions. The very high level of thermal maturity of the strata also resulted in very few identifiable Palynomorphs; however, Canol and Imperial formation samples yielded dates of Middle to Late Devonian and Frasnian to Famennian, respectively. XRD analyses indicate Canol Formation shale is highly siliceous whereas Road River Group shale and silty shale of the Imperial Formation are less siliceous and exhibit a more varied lithology. This study suggests that the Canol Formation is more prospective for shale gas than strata of the Imperial Formation or Road River Group.

Organization: Government of Yukon | Gouvernement du Yukon
Geology of Ogilvie Mountains Breccias, Coal Creek Inlier (116B/11, 13, 14) Yukon Territory

Geological map (1:50,000 scale) of the Ogilvie Mountains Breccias, Coal Creek Inlier, central Yukon (NTS 116B/11, 13, 14) including geological cross sections and mineral occurrences, as well as marginal notes on regional setting and decription and classification of Ogilvie Mountains Breccias.

Organization: Government of Yukon | Gouvernement du Yukon
Geophysical transect of the Eagle Plains foldbelt and Richardson Mountains anticlinorium, northern Yukon and western Northwest Territories, Canada

A 250 km long east-west geological and geophysical transect has been constructed at about 66 degrees 40'N latitude, from near the Yukon-Alaska border, across the Eagle Plains and Richardson Mountains Anticlinorium (RMA), to the Interior Platform in northwestern Canada. It includes reprocessed industry seismic reflection profiles, regional gravity data and drill hole information. The north trending RMA is interpreted as a contractional (pop-up) structure, bounded on the east and west by post-Carboniferous, pre- or syn-Cretaceous thrust faults, that is cored by lower Paleozoic and Proterozoic rocks. The location of the pop-up may have been controlled by a pre-existing west-facing crustal scale ramp at the top of the crystalline basement, because horizontal displacement required to accommodate the pop-up, about 33 km, probably occurred above regional detachment(s) which project westward beneath the Eagle Plains. Contractional deformation in the Eagle Plain fold belt is probably the same age.

Organization: Government of Yukon | Gouvernement du Yukon
Particle-size distribution of gold within the Sulphur and Dominion creek drainages, Klondike District, Yukon, and implications for gold winning and the formation of distal placers containing fine gold

A reduced efficiency of gold recovery with decreasing particle size using a sluice box raises the possibility of a very fine gold resource within the Klondike. The grade of fine gold within gravel recovered from the southern Klondike was assessed using a combination of screening and bulk leaching by cyanidation. This approach eliminates the nugget effect and size ranges selected correspond to particle sizes exploitable by different metallurgical methods: <53 µm (cyanidation), 53-125 µm (‘enhanced g’ concentrators), 125-500 µm (sluice boxes). Colluvium, virgin gravel and tailings from various mining operations were collected from a relatively long drainage where accumulation of fine gold could feasibly occur. In all samples, gold <125 µm was negligible. Despite this negative result, this approach to resource evaluation is straightforward and could be applied advantageously in other areas where source mineralization contains fine gold. A distinction should be made between placer gold grains of fine but equant nature derived from proximal mineralization and gold rendered fine and flaky by fluvial transport.

Organization: Government of Yukon | Gouvernement du Yukon