AndreaBozzo/ceres-open-data-index huggingface dataset:
Report on the Detailed Mineral Assessment of the Proposed Kusawa Natural Environment Park Special Management Area, Yukon

The proposed Kusawa Special Management Area (SMA) consists of 3118.6 km2 in southwestern Yukon. A map notation in 1972 denoting Kusawa Lake and the surrounding area as a possible park planning area is included in the proposed Kusawa Special Management Area (SMA). This has discouraged mineral exploration programs in the area since then. The area was selected as a SMA by the Carcross Tagish First Nation, with Kwanlin Dun and Champagne and Aishihik First Nations being co-signers, with the intention of making the proposed Kusawa SMA a Natural Environment Park.

In 2001 the Yukon Department of Energy, Mines and Resources (EMR) carried out a regional mineral assessment, which reviewed the geologic data for SW Yukon and ranked the tracts. Of the seven partial tracts lying within the proposed SMA, five are ranked highest, one moderate and one is ranked lowest relative regional mineral potential with respect to phase IV (SW Yukon) of the Yukon regional mineral potential map. Most of the proposed Kusawa SMA lies within the Nisling sub-terrane with eastern portions underlain by units of the Stikine terrane. Both terranes were affected by post accretion Cretaceous to Pliocene magmatism resulting in most of the area being underlain by unfoliated granitoids. Structurally the metamorphic rocks have a strong NW trending grain and are generally closely folded.

Fieldwork entailed the collection of rock, soil and stream sediment samples, in conjunction with geological mapping and examination of the seven mineral occurrences within the area. The mineral occurrences are intrusive related and consist of an auriferous quartz vein, lead-zinc skarns, a copper porphyry and two unknown occurrences. The eastern side of the study area, including the NW trending belt of Nisling Assemblage metamorphic rocks ranked the highest mineral potential. An oval aeromagnetic anomaly partially underlain by hypabyssal felsic porphyry rocks with anomalous geochemistry, located on the west side of the proposed SMA ranked also ranked relatively highest.

Organization: Government of Yukon | Gouvernement du Yukon
Placer gravels of Miller Creek, Sixtymile River area, 116 B,C

Within the Sixtymile River drainage basin, Quaternary placer deposits include tributary valley bottom gulch gravel, a broad main valley alluvial plain, and high level terrace systems in both tributary and main valley settings. After downcutting, paleo-Miller Creek underwent valley widening during alluvial fan erosion and sedimentation. During this time, the main Sixtymile River valley was also being laterally eroded during braidplain aggradation. Terrace development and incision through both fan and braidplain sediments coincided with significant debris flow sedimentation. The Sixtymile River changed from a braided environment to single channel meandering environment during terrace development.

Incision of Miller Creek through the fan surface to present levels probably coincided with downcutting of the Sixtymile River. Economic concentrations of placer gold are found in:: 1) the upper Miller Creek terrace where coarse-grained, massive and angular flood flow gravel forms a crude pay streak above the bedrock surface; 2) the distal Miller Creek terrace where discontinuous concentrations of gold were formed over a broad paleo-surface of lag gravel prior to fan aggradation; 3) laterally discontinuous pockets in the main Sixtymile valley terrace which was originally part of an aggraded braidplain sequence; and 4) lower, but still economic placer concentrations in gravels of the alluvial plain in the main Sixtymile valley.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary observations on the geology and geochemistry of quartz veins in the Klondike District, west-central Yukon

Four main styles of quartz veining are recognized in the Klondike District. These include foliaform and discordant mesothermal quartz veins in schistose metamorphic rocks, quartz-carbonate veins in altered ultramafic rocks and greenstones, epithermal chalcedony veins cutting Eocene igneous and sedimentary rocks, and low-temperature epithermal veins associated with intensely altered Plio-Pleistocene White Channel Gravel deposits. Foliaform mesothermal quartz veins are invariably barren; however discordant mesothermal veins locally contain visible gold. Both styles of epithermal veins in the Klondike contain at least geochemically anomalous levels of gold. The complex history of hydrothermal activity in the Klondike has led to considerable confusion about the nature of veining in this area. The results of this study provide a preliminary framework within which to evaluate the various prevailing theories regarding the major sources of gold in the Klondike placer deposits.

Organization: Government of Yukon | Gouvernement du Yukon
Geological and U-Pb age constraints on base and precious metal vein systems in the Mount Nansen area, eastern Dawson Range, Yukon

Epithermal vein and porphyry-related gold-silver deposits in the Mount Nansen area are mainly hosted in Paleozoic Yukon-Tanana Terrane metasedimentary rocks and Early Jurassic Big Creek Batholith intrusive rocks. Mineralization is spatially, and probably temporally, related to a northwest-trending belt of mid-Cretaceous hypabyssal felsic intrusions and dykes along the Mount Nansen Trend. The proximal relationship between the veins and mid-Cretaceous intrusive rocks suggests that mineralization may be genetically related to felsic magmatism. The Dickson stock yields a U-Pb zircon age of 108.3 ± 0.7 Ma, and proximal dykes in the Flex, Dickson, Brown-McDade and Weber zones give ages of 107.9 ± 0.9 Ma to 109.0 ± 0.7 Ma, similar to the age of the Mount Nansen Group
volcanic rocks. Granodiorite that hosts the Dickson deposit gives a U-Pb titanite age of 191.5 ± 2.9 Ma, and is likely part of the Big Creek Batholith. Previous studies indicated two periods of mineralization in the Dawson Range: mid-Cretaceous and Late Cretaceous. Dating indicates that Mount Nansen mineralization is associated with the mid-Cretaceous emplacement of the high-level felsic intrusions.

Organization: Government of Yukon | Gouvernement du Yukon
Origin of the Clinton Creek Asbestos Deposit

Asbestos in most Cordilleran deposits has been considered a product of fracturing, metasomatism and thermal metamorphism of ultramafic rocks by mesozoic intrusions. Such a history has been postulated for the exhausted asbestos deposit at Clinton Creek, 77 km northwest of Dawson City, Yukon. This report contains another interpretation of the mine geology. It is based on the premise that the ultramafic host rocks represent slices of oceanic crust thrust onto the North American craton during Mesozoic arc-continent collision. A critical fossil occurrence demonstrates that intensely deformed asbestos-bearing serpentinite and other cataclastic rocks are tectonically interleaved with weakly deformed Triassic and older (?) shale and sandstone of the younger, southwestern part of the Cordilleran miogeocline. Brittle fracturing, hydration and asbestos formation likely occurred during final emplacement of the ultramafic rocks onto the wet miogeoclinal strata.

Organization: Government of Yukon | Gouvernement du Yukon
Faro Tailings Area Downhole Geophysics Program to Study Contaminant Plumes, Yukon

A Geophysical Program was conducted at 5 groundwater monitoring wells on March 4, 2000 at the Faro Tailings Area, Rose Creek, Faro, Yukon under the auspices of the Yukon Government's Mine Research fund, DIAND Mineral Resources and Environment Canada by EBA Engineering Consultants Ltd.

The EM39 geophysical instrument is able to measure the electrical conductivity of the ground within about 1 metre of the probe. The probe is a cylinder 3.6 cm in diameter and 1.6 m long. The probe is slowly lowered down a water well and as it is lowered, it measures the conductivity of the soils surrounding the well. As the probe is lowered, any changes in the electrical conductivity of the ground indicates either:: 1) changes in the levels of contaminants (metals like zinc in this case) in the ground, or; 2) changes in the type of soil - for example if there is sand and then a layer of clay or silt. In order to distinguish whether the change is due to 1) or 2) a gamma probe was also used. The gamma probe is also slowly lowered down the well and it only measures changes in the type of soil. By comparing the readings of the two probes, one can determine what vertical zones in the soil were being affected by changes in the levels of contaminants in the soil and the soil's groundwater.

Organization: Government of Yukon | Gouvernement du Yukon
Mineralogical and geochemical study of the True Blue aquamarine showing, Shark property, southern Yukon

The True Blue aquamarine occurrence in the Quiet Lake area of southern Yukon is underlain by Paleozoic Cassiar Platform miogeoclinal clastic and carbonate rocks, a Mississippian syenite stock, Mississippian felsic metavolcanic rocks (Pelly Mountain Volcanic Belt), and a small carbonatite body associated with the syenitic intrusion. Beryl occurs in quartz veins and tension gashes, and is restricted to those that cut the syenite. Accessory minerals in the quartz veins include varying amounts of fluorite, siderite, calcite, allanite and ilmenite. Mineralization has been dated at 172 ± 5 Ma, using the Sm-Nd system on fluorite from several veins. Aquamarine discovered on the property is distinctive because of its deep blue colour and high Fe2+ concentration, up to 5.79 wt.% FeO. During the 2004 field season, diamond chainsaws were used to extract berylbearing vein material from the syenite.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Mineral Deposits Summary 2009

The following tables have been compiled from information derived from the Yukon MINFILE 2008 — An database of mineral occurrences (Deklerk, 2008), and from various technical reports and information that have been filed in the SEDAR system by, or on behalf of, public companies. Reserve and resource figures presented are not calculated by Yukon government personnel, but are quoted from referenced industry sources, publications, assessment and/or technical reports, etc. (see next page). The reader is encouraged to refer to the original data for detailed information.

Organization: Government of Yukon | Gouvernement du Yukon
Geology, alteration, and mineralization of the Sato porphyry copper prospect, southwestern Yukon

The Sato prospect is located between Aishihik Lake and Long Lake in southwestern Yukon Territory. Low grade porphyry-style copper mineralization was discovered on the property in 1969. The main country rock in the study area is a potassium feldspar megacrystic granite that is correlated with the Early Jurassic Aishihik and/or Long Lake plutonic suite. Mineralization on the property is hosted by a multiphase intrusive complex that is thought to represent a high level intrusive member of the Late Cretaceous Mount Creedon volcanic suite. The complex consists of three distinct phases, medium-grained diorite; coarse-grained diorite; and porphyritic quartz monzodiorite. U-Pb zircon dating of the medium-grained diorite and porphyritic quartz monzodiorite phases gives ages of 78.2 ± 0.1 Ma and 78.8 ± 0.2 Ma, respectively, which supports the correlation with the Mount Creedon Volcanic Suite.

Four alteration zones are recognized on the property. Alteration is mainly developed in the medium-grained diorite and quartz monzodiorite phases. In order of decreasing intensity, these zones include potassic, phyllic, albitic, and propylitic. Copper mineralization consists of chalcopyrite, which occurs as a replacement of earlier-formed magnetite in the potassic and phyllic zones, and malachite which occurs on weathered fracture surfaces.

Alteration and mineralization on the property are thought to be related either to fluids evolved during the latest stages of crystallization of the main phase diorite unit or from a buried, younger phase of the intrusive complex.

Organization: Government of Yukon | Gouvernement du Yukon
Evaluation of titanite as an indicator mineral for tungsten-skarn mineralization

One of the challenges in exploring for skarn mineralization is that barren skarn may not give any indication that mineralization is close by. The purpose of the present study is to evaluate titanite as an indicator mineral for tungsten-skarn mineralization. Titanite from samples of scheelite mineralization from the Risby, Ray Gulch and Mactung deposits was analysed by electron microprobe. The titanite is fluorine-rich and some grains contain anomalous tin, but in most grains metal concentrations are at or below the detection limits of the microprobe (~20-50 ppm). Future work is planned to analyze titanite by LA ICP-MS to determine, in particular, the W-Mo-Sn contents to further evaluate the use of titanite as an indicator mineral for W skarn exploration.

Organization: Government of Yukon | Gouvernement du Yukon
2018–19 Supplementary estimates no. 1

Supplementary estimates no. 1 for the Government of Yukon 2018-19 Budget. 
This document was prepared by the Department of Finance under the direction of Management Board for the 2nd Session of the 34th Legislature, Yukon Legislative Assembly. October 2018, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Constraints on the evolution of placer deposits at Gladstone Creek, Yukon (NTS 115G/7, 8)

Gladstone Creek hosts a productive placer mine and has been glaciated at least three times. Glaciations eroded bedrock and reworked surficial materials, depositing thick sequences of sediment in Gladstone valley, which were subsequently fluvially incised during deglaciation and non-glacial intervals. Fluvial incision and reworking concentrated detrital gold in coarse gravel units that commonly overly bedrock or false-bedrock surfaces. Identifying false-bedrock units in stratigraphy may help placer miners target economical gold deposits perched above the valley bottom.
Gold grain samples were collected from four gravel units. Characterization of gold grain morphology and laser ablation ICP-MS analysis indicate multiple sources of lode mineralization. Based on regional ice flow directions and the stratigraphic and geographic locations of the gold samples, gold is likely sourced from epithermal and gold-rich porphyry deposits associated with the Ruby Range batholith, and orogenic mineralization in the Kluane schist.

Organization: Government of Yukon | Gouvernement du Yukon
A sedimentologic description of Clear Creek Fluviatile sediments 115 P, central Yukon

Clear Creek drainage basin contains fluviatile gravels which have been explored and mined for placer gold since the early 1900's. This paper briefly describes the various fluvial sediments in Clear Creek drainage basin, interprets the described facies, and outlines the fluvial environment which influences the distribution of placer gold in Clear Creek gravels.

Organization: Government of Yukon | Gouvernement du Yukon
Application of Landsat TM thermal imagery to structural interpretations of the Tintina Trench in west-central Yukon

The structure of the Tintina Fault Zone (TFZ) within the Tintina Trench in west-central Yukon is almost completely unknown, due largely to very poor exposure, and thick overburden cover. In this study, we have used digitally enhanced Landsat Thematic Mapper thermal imagery as a basis for a preliminary structural interpretation of the Tintina Trench in the Dawson-McQuesten area. Linear features visible on the enhanced images are divided into first order (obvious, long strike-length), second order (less obvious, shorter strike-length), and third order (subtle, very short strike-length) lineaments. The images show major, NW-SE trending first and second order lineaments within the Trench which we interpret to be separate strands of the TFZ. Sag ponds and fresh fault scarps in glacial drift along these lineaments attest to relatively recent fault activity. NE-SW trending first and second order lineaments that cut obliquely across the Trench are considered to be late faults and fracture zones which formed after major strike-slip displacement on the TFZ. Third order lineaments show strong preferred orientations over large portions of the image area, and are thought to reflect overall structural grain (bedding or foliation trends and/or regionally-developed joint patterns).

Organization: Government of Yukon | Gouvernement du Yukon
Improvements in the regional earthquake focal mechanism catalogue for southwestern Yukon

Earthquake source characteristics provide a valuable constraint on fault behaviour, crustal stress, and regional plate tectonics. In southwestern Yukon, a region of complex active tectonics, studies of earthquake sources have historically been limited by sparse seismic network coverage. In this work, we leverage recent improvements in station coverage to estimate focal mechanisms for small and moderate-magnitude (M ≥ 2.0) earthquakes from P-wave first-motion polarity data. We invert these data using a probabilistic method that rigorously quantifies mechanism uncertainties. We present preliminary solutions for 363 events, which improve the spatial coverage of the focal mechanism catalogue for this region. We observe contrasting P-axis orientations for events on either side of the Fairweather fault. For events within southwestern Yukon, the distribution of faulting mechanism types and P-axis orientations are relatively consistent. Our focal mechanism solutions support the existence of an unmapped fault south of the Duke River fault. Finally, our results provide a valuable input for subsequent detailed analysis of crustal stress throughout the region.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon-Tanana Terrane in southwestern Frances Lake area (105H/3, 4 and 5), southeastern Yukon

Yukon-Tanana Terrane (YTT) in Frances Lake area consists of three domains: the Money/Jules Creek thrust sheet, the foot wall of the Jules Creek thrust, and a northeastern domain defined primarily by Permian (?) conglomerate. The Money/Jules Creek thrust sheet comprises chert, dark argillite and limestone, Mississippian meta-volcanic and meta-plutonic rocks, and Pennsylvanian carbonate. A dark argillite, chert, and coarse clastic unit of probable Pennsylvanian age unconformably overlies both the hanging wall and foot wall of the Money Creek thrust. The foot wall of the Jules Creek thrust comprises a lower unit of dark argillite, chert, chert-pebble conglomerate, and rare sandstone, limestone and variegated chert, and unconformably overlying conglomerate and basalt. The Pennsylvanian-Permian Campbell Range basalt overlies, probably unconformably, rock units of both domains. The northeastern domain comprises mainly Permian (?) polymictic conglomerate and sandstone. Conglomerate clasts come from YTT, implying an unconformable relationship. The back-arc rocks of YTT that host the Finlayson Lake volcanogenic massive sulphide (VMS) deposits are truncated by the Money Creek thrust; however, VMS-style prospects occur in coeval volcanic arc rocks in the Money Creek thrust sheet, attesting to the potential for new deposits in these rocks.

Organization: Government of Yukon | Gouvernement du Yukon
2020 Wildland fire management bulletins

Archived wildfire bulletins from 2020. See [current wildfire bulletins on Yukon.ca](https://yukon.ca/blogs/wildfire-bulletins).

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

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary Quaternary geology of Coal River area (NTS 95D), Yukon

Quaternary geology investigations in the Coal River map sheet (NTS 95D) during the 2009 field season focused on characterizing surficial materials and their distributions, with attention to the eastern half of the map sheet which has not been previously mapped. Moraine deposits are relatively thin in valley bottoms (<2 m) and become thinner and more intensely colluviated on upland surfaces. Streamlined glacial landforms and till plains are pronounced in the southern half of the map sheet. Surficial deposits are limited in many east-trending meltwater canyons, and in the northeastern corner of the map sheet.
The map area was glaciated most recently by the Cordilleran Ice Sheet, which advanced from the south and west. Meltwater from montane glaciers and the Laurentide Ice Sheet in adjacent map sheets likely contributed to extensive glaciolacustrine, glaciofluvial and glaciodeltaic deposits in north-trending valleys that were dammed by the Cordilleran Ice Sheet.

Organization: Government of Yukon | Gouvernement du Yukon
Regional scale 3D modelling of magnetic data to assess carbon mineralization potential of serpentenized ultramafic rocks in the Yukon

Serpentinized ultramafic rocks contain minerals that are highly reactive with CO2. These rocks are becoming increasingly recognized for their potential to act as atmospheric CO2 sinks. Carbon mineralization locks CO2 in carbonate minerals and stores it over geological time scales. This is a naturally occurring process but one that can be accelerated through increasing the available surface area of serpentinized material, or through injection of CO2-enriched fluids into serpentinized rock substrates. The Yukon has significant occurrences of ultramafic rock throughout the territory, covering a mapped areal extent of approximately 2000 km2. This work represents a preliminary attempt to review territorial opportunities for carbon mineralization via ultramafic rocks. Regional scale magnetic data which can help identify serpentinized parts of ultramafic bodies was used to remotely locate prospective ultramafic rocks in the Yukon, and to model targeted bodies in 3D to derive their volumes and estimate their CO2 mineralization capacities. Local volumes of serpentinized rock modelled within the depth interval of 0 to -4000 m range up to 361 km3, and total capacity estimated for all modelled sites in the Yukon from 0 to -4000 m depth is >1600 GtCO2. In order to meet emissions-offset targets required to mitigate climate change, such natural carbon sinks providing potentially large storage capacities must be considered part of the solution. Results of this study, based on regional-scale public datasets, are meant as a guide to direct future investigations with higher resolution mapping, data collection, and modelling, together with necessary consideration to existing land ownership, land use, infrastructure, and access.

Organization: Government of Yukon | Gouvernement du Yukon
A geochemical and Sm-Nd isotopic study of Cordilleran eclogites from the Yukon-Tanana Terrane

A copy of this thesis is available at the EMR library – QE195 G66 1998.
This thesis is available online at https://era.library.ualberta.ca/items/efe4b7c1-8caf-40c0-a4fe-386db8129422/view/0174a764-0e16-4416-9e99-e927ca23960f/MQ28939.pdf.

Organization: Government of Yukon | Gouvernement du Yukon