AndreaBozzo/ceres-open-data-index huggingface dataset:
Geology of the Mayo Map Area, Yukon Territory (NTS 105M)

Late Proterozoic to Triassic, moderately to highly strained sedimentary rocks are exposed in two overlapping thrust sheets in the Mayo map area. The more southerly Robert Service Thrust sheet contains Hyland Group (Late Proterozoic to Cambrian) sandstone and grit with rare limestone and minor maroon argillite, overlain by a Cambrian to Middle Devonian succession of dark coloured siltstone, limestone and chert in the southern quarter of the map area. These strata, a component of the regional Selwyn Basin, are unconformably overlain by Upper Devonian Earn Group argillite, chert and chert pebble conglomerate. The latter succession contains widespread indications of stratiform Pb-Zn-barite mineralization. 
To the north the Tombstone Thrust sheet consists of highly strained Earn Group (formerly ¿Lower Schist¿) carbonaceous phyllite, felsic meta-tuff and metaclastic rocks, succeeded by Carboniferous Keno Hill quartzite, that is thickened by internal recumbent folds or thrusts in the north central part of the map area. These units host the Ag-Pb-Zn veins of the Elsa-Keno Hill camp, and contemporaneous meta-tuff that contains a volcanogenic massive sulphide deposit immediately northeast of the map area.
Jurassic (?) and Cretaceous contraction produced regionally developed penetrative fabrics and folds of various scales as well as thrust faulting. A domain of intensely developed foliation and lineation underlies the northern half of the map area, imparted during two or more phases of movement on the Tombstone Thrust.
Granitic intrusions of the 91-94 Ma Tombstone Suite crosscut regional structure. The McArther batholith parallels the Tintina Trench and is associated with copper skarns. Other stocks throughout the map area are notable for vein-tungsten and tin, and were the probable heat source for epi- and meso-thermal veins of the Elsa-Keno Hill mining camp. In neighbouring regions, Tombstone intrusions are the focus of exploration for disseminated vein-gold similar to deposits north of Fairbanks, Alaska and east of Dawson, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary report on early Tertiary clastics, west-central Yukon

Examination of Early Tertiary clastic rocks in the Indian and Sixty Mile River areas has revealed that: 1) sediments are arranged in fining-upward sequences and are dominated by sandstone and to a lesser extent conglomerate; 2) the clastic sequence in the Indian River area is thicker than previously thought; and 3) conglomerate beds consist mainly of white vein quartz, Nasina Quartzite, Klondike Schist and chert pebbles. The metamorphic clasts were probably locally derived and the chert pebbles were eroded from the Ogilvie Mountains. These clastic rocks are interpreted as being deposited in separate, but coeval, continental basins that were mainly fed by southward flowing braided-rivers.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary results and structural interpretations from drone lidar surveys over the Eastern Denali fault, Yukon

The Yukon Geological Survey and Kluane First Nation intend to drill a temperature gradient well near Burwash Landing, YT, to evaluate the geothermal energy potential of the area. The preferred drill site is located immediately southwest of the Eastern Denali fault (EDF), which has ruptured multiple times in the Holocene. The kinematics and recent activity of the fault are important factors to consider when developing a geothermal resource, for two purposes: 1. identifying zones of enhanced permeability due to local fault geometry and 2. assessing the seismic hazard of drilling and developing a geothermal system along an active fault. Here, we present new lidar data collected from a drone platform, which enabled the production of 30 cm spatial resolution bare-earth Digital Terrain Models (DTMs) over several segments of the EDF. These products offer a considerable increase in both spatial resolution and canopy penetration compared to existing spaceborne and airborne photogrammetric Digital Surface Models (DSMs) and DTMs of the area. We use hillshades to map segments of the EDF surface trace in detail, and we make preliminary interpretations about the structure and kinematics of the fault. Offset stream channels and hill slopes that cross the fault at high angles indicate dextral offsets ranging between 5 and 75 m. Vertical separation ranges between 0 and 20 m, varying between northeast and southwest-side up. We confirm previous interpretations that the geothermal drill site is located at a minor releasing bend in the fault. Previous fault maps based on ArcticDEM data showed multiple fault splays parallel to the EDF at the geothermal drill site, whereas the lidar data indicate strain is concentrated to a singular fault plane in this area. The EDF is characterized by a series of sediment mounds that we interpret to be positive flower structures. The higher spatial resolution achieved by the drone reveals possible compressional structures (fault tips or folds) consistent with dextral transpression on the surface of these mounds. We recommend additional drone lidar acquisition, field studies, geophysical analysis, and kinematic modeling to be carried out over the coming year.

Organization: Government of Yukon | Gouvernement du Yukon
An alpine peridotite in the Dawson Range, Yukon-Tanana Terrane: Preliminary results and interpretations

This report summarizes the results of geological mapping and preliminary petrological studies of an exposure of ultramafic rocks, the Buffalo Pitts Peridotite (BPP), in the eastern Dawson Range, central Yukon. The BPP is characterized by fresh spinel peridotite. Plagioclase mantles on spinel grains are interpreted to have developed during decompressive metamorphism during exhumation from sub-crustal depths to mid- to upper-crustal depths. The peridotite body forms a foliaform lens 580 m by 100 m that is enclosed in and intruded by leucocratic, biotite-garnet-corundum blue orthogneiss.The peridotite and blue corundum orthogneiss are in turn hosted in a north-dipping panel of amphibolite-grade metamorphic rocks that are included in the pericratonic Devono-Mississippian Wolverine Creek metamorphic suite, part of the Yukon-Tanana Terrane. Quartzite, quartz-mica schist and amphibolite with minor marble and calc-silicate units occur largely south of, and structurally beneath the peridotite body. Leucocratic tonalite gneiss, part of the ~357 Ma Selwyn Gneiss, occurs north of, and structurally above the BPP. Tonalite veins intrude the blue corundum orthogneiss and are interpreted as marginal intrusions of the Selwyn orthogneiss. Intrusion of dykes derived from the Selwyn Gneiss requires exhumation and emplacement of the BPP and the enclosing blue corundum orthogneiss in or prior to the earliest Mississippian.

Organization: Government of Yukon | Gouvernement du Yukon
Model of mineralization related to cauldron facies syenite in the Pelly Mountains

The Mississippian volcanic rocks and associated mineralization in the Pelly Mountains were studied by J. Morin during 1979 and 1980. Alkaline and calc-alkaline Mississippian volcanic rocks lie above Paleozoic platform strata of carbonate, volcanic and minor fine-grained clastic rocks. The volcanic belt can be divided into four facies designated by lithology. A model is proposed here that relates cauldron facies geology to the associated mineralization.

Organization: Government of Yukon | Gouvernement du Yukon
An Evaluation of Ground Penetrating Radar as a Tool in Placer Exploration

A test of ground penetrating radar (GPR) was conducted on 10 placer deposits throughout the Yukon in March 1993. At each site, profile surveys were conducted near known depths to bedrock (drill holes, shafts or excavations), overburden GPR velocities were measured with common mid-point (CMP) velocity surveys and overburden resistivity was measured with horizontal loop electromagnetic (HLEM) resistivity soundings. Survey sites were located in frozen deposits in unglaciated terrain, in thawed deposits in glaciated terrain and in frozen deposits in glaciated terrain.

In frozen unglaciated deposits in the Klondike and Moosehorn areas, GPR penetration varied from 10-28 m and averaged 19 m. Signal attenuation in thawed black muck and scattering within boulder layers limited penetration at two sites to about 10 m. The weathering of phyllitic and schistose rocks to clay enhances bedrock reflections; weak bedrock reflections were recorded due to a lack of dielectric contrast in deposits underlain by resistant bedrock. GPR performance is enhanced by surveying during winter or late spring when the zone of seasonal thawing is thoroughly frozen. Under optimum conditions, strong continuous bedrock reflections were recorded over distances of several hundred metres and accurate bedrock mapping was possible with a minimum of confirmatory drill holes.

Organization: Government of Yukon | Gouvernement du Yukon
Structural evolution and controls on gold mineralization at Clear Creek, Yukon

Gold mineralization in the Clear Creek area is associated with ca. 92 Ma Tombstone Plutonic Suite intrusions (TPS) emplaced into metasedimentary rocks of the Neoproterozoic to Early Cambrian Hyland Group. Hyland Group rocks have undergone four ductile deformations (D1-D4 ) in the structurally thick (>10 km) Jura-Cretaceous Tombstone high strain zone. Kinematic features indicate overall top-to-the-northwest movement on shallow shear planes. Four different types of quartz veins developed during ductile deformation and are associated with a progression from ductile to brittle-ductile behaviour. Three major brittle structural trends postdate ductile deformation. A set of sinistral ~165° striking faults developed and are crosscut by secondary east-west fracture zones in Hyland Group rocks. The Tombstone Plutonic Suite was then emplaced in a broadly east-west oriented belt, with some local control exerted by the ~165° oriented faults. Continued development of the east-west fracture set after the Tombstone
Plutonic Suite intrusion, resulted in an extensive system of gold-bearing sheeted quartz veins. Finally, sinistral reactivation and associated quartz-tourmaline veining occurred on ~165° oriented structures.

Preliminary analysis of fault geometry and connectivity suggests the most favourable sites for mineralization are east-west fracture zones connected to ~165° oriented faults. Other favourable structural sites include misoriented segments of ~165° faults and possibly northeast-striking structures connected to ~165° faults. Mapping has delineated a large area of contact metamorphism suggesting extensive shallowly buried intrusions. The highest priority in any exploration program should be given to sites that are coincident with shallowly buried, or that are near Tombstone Plutonic Suite intrusions and have the above fault/fracture geometries.

Organization: Government of Yukon | Gouvernement du Yukon
Geologic setting and petrology of the Proterozoic Ogilvie Mountains breccia of the Coal Creek inlier, southern Ogilvie Mountains, Yukon Territory

Ogilvie Mountains breccia (OMB) is in Early (?) to Late Proterozoic rocks of the Coal Creek Inlier, southern Ogilvie Mountains, Yukon. Host rocks are the Wernecke Supergroup (Fairchild Lake, Quartet and Gillespie Lake groups) and lower Fifteenmile group. Ogilvie Mountains breccia crops out discontinuously along two east-trending belts called the Northern Breccia Belt (NBB) and the Southern Breccia Belt (SBB). Individual bodies of OMB vary from dike and sill-like to pod-like. The NBB coincides with a north side down reverse fault—an inferred ruptured anticline—called the Monster fault. The SBB coincides with a north side down fault called the Fifteenmile fault. The age of OMB is constrained by field relationships and galena lead isotope data. The age of OMB formation is between 1.45 and 0.90 Ga.

Hydrothermal alteration has locally overprinted OMB and introduced silica, hematite and sulphide minerals. Rare earth element chemistry reflects a lack of mantle or deep-seated igneous process in the formation of OMB. However, this may be only an apparent lack because flooding by a large volume of sedimentary material could obscure a REE pattern indicative of another source.

This thesis is available online at https://open.library.ubc.ca/cIRcle/collections/ubctheses/831/items/1.0052352. This thesis is available at the EMR library – QE446.Y8 L36.

Organization: Government of Yukon | Gouvernement du Yukon
Potential heat production from the Seagull and Teslin plutonic suites, southern Yukon: Geochemistry, geochronology, rock physical properties, and 3D geophysical inversion of Bouguer gravity data

Cretaceous granitoid plutons of the Seagull and Teslin plutonic suites, east of Teslin, are evaluated for their potential radiogenic heat production. The Seagull suite comprises ultra-fractionated, A-type granites dated at ca. 103–101 Ma that have anomalous average heat production values (A) of 7.9 to 9.9 µW/m3. The Teslin suite is older (ca. 121–109 Ma) and characterized by more intermediate granodiorite compositions that mostly have average A values of 2.0 µW/m3, closer to global averages. Locally, anomalous A values of 4.5 to 11.4 µW/m3 are associated with younger (ca. 110–108 Ma), more evolved granitic phases of the Teslin suite. The 3D inversion of Bouguer gravity data provides models that constrain the subsurface density character and extents of the Hake and Seagull batholiths, and estimated volumes of ~4624 and 2744 km3, respectively. The combination of these results suggests that potential heat energy of ~36.5 MWt may be contained in the Hake batholith, and as much as 27.2 MWt in the Seagull batholith.

Organization: Government of Yukon | Gouvernement du Yukon
Mineral Industry Report 1971 - 72

This report is a review of the Yukon mineral industry for 1971 and 1972 by the Northern Economic Development Branch of the Department of Indian Affairs and Northern Development. The information in this report was obtained from property visits, communication with company personnel, technical reports of companies, trade journals and reports of the Mining Recorders of the Dawson, Mayo, Watson Lake and Whitehorse Mining districts.

Organization: Government of Yukon | Gouvernement du Yukon
Mamu-Bravo-Kulan claims: A VHMS exploration target based on geochmical and geophysical anomalies in Mississippian volcanics within Cassiar Platform, NTS 105-F/7, 8, 9, & 10

The Mamu-Bravo-Kulan property is situated within the Cassiar Platform which is composed mainly of moderately faulted and folded Paleozoic miogeoclinal clastic and carbonate sedimentary rocks. The Mamu property covers a package of Mississippian volcanics and Devonian sedimentary rocks intruded by or in faulted contact with a Mississippian intrusive complex.

Preliminary exploration work was undertaken in 1995 and 1996. Coincident multi-element (Pb, Zn, Cu, Fe, and Cd) soil geochemical anomalies associated with total field magnetic anomalies indicated that the property may host VMS style mineralization associated with Mississippian felsic and intermediate volcanic rocks.

Organization: Government of Yukon | Gouvernement du Yukon
Regional stream sediment and water geochemical data, Eastern Yukon and Western Northwest Territories (NTS 105I)

Archived Content Notice: This publication is provided for reference, research or recordkeeping purposes. It is not subject to the Government of Canada Web Standards and has not been altered or updated since it was archived.

This is the second in a series of re-formatted Yukon National Geochemical Reconnaissance Open Files. Data were originally released in 1982 as GSC Open File 868. Re-analysis by INAA was carried out and released in 1999 as GSC Open File D3772. This is a CD-ROM of stream sediment and water geochemistry data for the Nahanni Map area. The following analyses were completed on stream sediments: Ag, As, Au, Ba, Br, Cd, Ce, Co, Cr, Cs, Cu, Eu, F, Fe, Hf, Hg, La, Loss-on-ignition, Lu, Mn, Mo, Na, Ni, P2O5, Pb, Rb, Sb, Sc, Sm, Ta, Tb, Th, U, V,W, Yb, and Zn. Stream waters were analyzed for: total alkalinity, Ca, Cl, F, Fe, K, Mg, Mn, Na, Nitrate, pH, phosphate, sulphate, U, and Zn.

The full publication details and metadata can be found on the GSC website here:
https://geochem.nrcan.gc.ca/cdogs/content/pub/pub00399_e.htm

Organization: Government of Yukon | Gouvernement du Yukon
Structure and Stratigraphy of the MacMillan Fold Belt: Evidence for Devonian Faulting

This study describes the structural and stratigraphic setting of Devonian bedded barite and sedimentary exhalative lead-zinc-silver-barite deposits near MacMillan Pass in eastern Yukon. It shows that the deposits occur within MacMillan Fold Belt, an anomalous west-trending feature made up of three parallel elongate domains called the North, Central and South Blocks. Each is characterized by distinctive styles of deformation and Devonian strata.
The North Block is characterized by a thick Early and Middle Devonian chert and shale sequence included in the Lower Earn Group and by an intricate array of southerly directed thrust faults. The Central Block includes unusually thick Early and Middle Devonian silty limestone intercalated with volcanic and volcaniclastic rocks within the upper part of the Road River Group. The Tom and Jason sedimentary exhalative zinc-lead-silver-barite deposits are associated with a thick sequence of coarse clastic rocks thought to belong to a submarine fan complex within the Lower Earn Group. Tight, upright folds, high angle reverse faults and irregularly oriented faults are characteristic.

In the South Block, the Lower Earn Group comprises a thin Devonian shale sequence. Open upright folds and few faults are the structural style. The differences in Devonian strata and contrasting style of deformation between blocks may reflect older (Devonian?) fault control to depositional patterns, but structures of that age have not been identified.

This report is accompanied by three 1:50 000-scale geological base maps of the MacMillan fold belt, east-central Yukon Territory (NTS map sheets 105 O/1,2,7,8 and parts of NTS map sheets 105 P/4,5 ).

Organization: Government of Yukon | Gouvernement du Yukon
Update on the bedrock geology of the Rusty Mountain and Bonnet Plume Pass (west half) areas

The Rusty Mountain and Bonnet Plume Pass areas are underlain by sedimentary strata of the Paleoproterozoic Gillespie Lake Group, Mesoproterozoic Pinguicula Group, Neoproterozoic Hematite Creek Group and Windermere Supergroup, and Paleozoic Bouvette Formation. Gabbro and diorite of the ca. 1.38 Ga Hart River sills intrude the Gillespie Lake Group. A swarm of east-west striking, mafic dikes intrude strata as young as the Tonian Hematite Creek Group. The main structures in the area include a steeply dipping axial-planar cleavage and upright, gently plunging folds. The northwestern part of the map area is dominated by northeast-southwest oriented structures that affected the ca. 1 Ga Hematite Creek Group, but predate deposition of the ca. 780 Ma Callison Lake Formation (Windermere Supergroup). In the southern and northeastern parts of the map area, the structures are parallel to and likely related to younger Mesozoic–Cenozoic structures.

Organization: Government of Yukon | Gouvernement du Yukon
2004–05 Supplementary estimates no. 1

Supplementary estimates no. 1 for the Government of Yukon 2004–05 Budget. 
This document was prepared by the Department of Finance under the direction of Management Board for the 1st Session of the 31st Legislature, Yukon Legislative Assembly. October 2004, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Morphology and geochemistry of soils formed on colluviated weathered bedrock: Case studies from unglaciated upland slopes in west-central Yukon

Soil morphology and geochemistry were studied at three mineral properties (gold; lead-zinc; copper-gold) in the unglaciated terrain of west-central Yukon. The purpose of this work was to describe soil and parent material properties, and to assess the effects of soil development and slope processes on element distribution in soils derived primarily from colluvium and weathered bedrock. At each property, soils were examined on slopes with opposing aspects. These results provide baseline pedological and soil-geomorphological descriptions for the Klondike Plateau, which will assist future biophysical mapping and contribute to our understanding of landscape evolution. Results pertaining to soil geochemistry provide landscape related
guidelines for mineral exploration. For example, the stratigraphic distribution of loess within soil profiles is described according to slope aspect. This allows the explorationist to design sampling procedures that are more likely to detect geochemical anomalies in the underlying bedrock. Soil geochemical variations in colluvium are shown to reflect upslope variations in bedrock lithology. Results of the soil particle size fraction geochemistry indicate that for base metal elements such as copper, lead and zinc, the -80 mesh component was generally the most responsive in either the B or C horizon. For gold, the -80 mesh fraction worked well in the B horizon, whereas the -230 mesh contained the highest concentration in the C horizon.

Organization: Government of Yukon | Gouvernement du Yukon
Report on the experimental vegetation plots established on 3 abandoned toxic Yukon mine tailings sites, revisited in 2009

In July 2009 we re-visited the re-vegetation experiments, which had been set up on tailings in the period 2003-2006. The three experimental sites are at Mount Skukum, United Keno and Wellgreen. The experiments consisted of either seeding the tailings with various populations of the tufted hair grass and/ or with stratified (cold temperature treated) seed of the shrub soapberry, or making transplants of the same two species. The treatments included the addition of compost from the City of Whitehorse, addition of fertilizer as 7:7:7 pellets, addition of organic matter as sheep manure, peat or woody debris from on site and, in the case of Wellgreen, a lime addition to overcome the strong acidity.

The results are striking and illustrated in the Plates 1-15. Data of performance and flowering success are shown in the Tables, as are chemical analytical data in the Figures and Tables. Plots set up in 2003 provide a nucleus for effective re-vegetation, having survived for 6 years. The success of the seedings and transplants at Mount Skukum and United Keno was good, while that at Wellgreen was very poor. Wellgreen has suffered flooding with washing out of plots and washing out of the neutralizing lime. Nevertheless, in compost additions plots at Wellgreen, set up in 2005 and 2006, a small amount of re-vegetation and survival has occurred, especially in the wetter areas near the tailings pond.

Organization: Government of Yukon | Gouvernement du Yukon