AndreaBozzo/ceres-open-data-index huggingface dataset:
Yukon Exploration and Geology 2017

This volume contains 11 technical papers:
E. Bordet - Bedrock geology of the Teslin Mtn and east Lake Laberge areas
S.H. Ellis et al. - Clast fabric analysis of glacial diamict, Liard Lowlands
T.A. Fraser et al. - Yukon shale studies overview
M.A. Friend et al. - Bedrock geology of the Mt. Freegold district
M.P. Hutchison - Devonian-Mississippian shale stata, Liard basin
K.E. Kennedy - Evidence for limited glaciatin, northern Kluane Range
T. Liverton and S. Casselman - Mod property, VMS mineralization
M.J. Manor and S.J. Piercey - Chronostratigraphic framework, Finlayson Lake region
D. Moynihan - Late Neoproterozoic limestone, Tillei and McPherson lakes
A. Steiner et al. - Carlin-type gold mineralization, Nadaleen trend
L.H. van Drecht and L.P. Beranek - Basal Laberge Group stratigraphy, Whitehorse trough

Organization: Government of Yukon | Gouvernement du Yukon
Ground penetrating radar investigation of the upper Yukon River valley between White River, Yukon and Eagle, Alaska

Ground penetrating radar (GPR) profiles were collected along mid-channel and side-channel bars from the confluence of the Yukon and White rivers in the Yukon, to Eagle, Alaska, a distance of 270 km. These profiles, although preliminary, demonstrate little variation in the thickness of valley-fill gravel (depth to bedrock) over that distance. Surveys show little difference in gravel thickness between the largest sediment source (White River) and more distal downstream reaches. The average thickness is approximately 10 m, which is equivalent to the maximum scour depth of the river. GPR surveys across the Tintina Fault along the Yukon River indicate a similar depth of fill compared to the upstream and downstream reaches from the fault zone, suggesting no significant recent vertical movement. These observations, when combined with the uplift history of the region (rates of 50-70 mm/ka determined in the Klondike area), suggest the region is likely undergoing either very slow uplift or is stable. No differential uplift is detectable within the error limits and sampling density of the GPR valley-fill method used in this study.

Organization: Government of Yukon | Gouvernement du Yukon
A study of barium minerals from the Yukon Territory

A study of rare barium minerals from the Yukon Territory has resulted in the discovery of at least one and possibly five new species. The present investigation is concerned with one of these, a barium-calcium-iron-alumino-silicate, which is tentatively classed as an inosilicate and named keeleite. The optical and physical properties, a chemical analysis, and the calculation of its formula are presented. The mineral has also been successfully synthesized. An X-ray study of some supergene and alteration products present in the rocks revealed the presence of an interesting mixture of barium-calcium carbonate salts, similar to those obtained as laboratory products. A paragenesis Is also presented.

Organization: Government of Yukon | Gouvernement du Yukon
Geology and structural setting of the Regal Ridge emerald property, Finlayson Lake district, southeastern Yukon

Emerald at the Regal Ridge property in the Finlayson Lake district of southeastern Yukon is hosted within mid-Paleozoic mafic metavolcanic and metaplutonic rocks. These rocks overlie the shallowly dipping western edge of a 112 Ma quartz monzonite body, and aplite dykes associated with the intrusion locally contain beryl. Beryl-bearing aplites chemically differ from non-mineralized intrusions by having lower potassium and fluorine, and higher beryllium contents. The main host rocks for the mineralization are high-calcium boninites (high-magnesium basalt to andesite) with anomalously high chromium contents. Beryl occurs either within quartz-tourmaline veins or in highly altered schist zones adjacent to the veins. Several generations of syn- to late-tectonic quartz veins are present at Regal Ridge, and emerald appears to be mainly associated with the latest vein set, especially near the intersection between these and older veins. All of the quartz veining is thought to be related to progressive Cretaceous deformation and the relatively late emplacement of the quartz monzonite intrusions.

Organization: Government of Yukon | Gouvernement du Yukon
Stratigraphic succession and U-Pb geochronology from the Teslin suture zone, south-central Yukon

A lithologic succession is recognized in tectonites of the eastern Teslin suture zone in south-central Yukon. Metagraywacke and quartzite, marble, mafic metavolcanics, and interbedded metagraywacke and argillite outcrop on both limbs of an upright northwest-trending syncline at Little Salmon Lake. A body of equigranular granodiorite intrudes the basal stratigraphic units. The granodiorite and its host sediments were penetratively deformed during top-to-the-SW shearing and greenschist facies metamorphism. The granodiorite gives a Devono-Mississippian U-Pb zircon age (353 +1.3/-1.4 Ma) which is interpreted as the minimum age of crystallization. This provides a minimum depositional age for these suture zone protoliths. Based on the sedimentary succession and the age constraints, the eastern suture zone protoliths show a clear genetic link to other pericratonic terranes in the northern Cordillera.

Organization: Government of Yukon | Gouvernement du Yukon
2008–09 Supplementary estimates no. 1

Supplementary estimates no. 1 for the Government of Yukon 2008–09 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 2008, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
The Fyre Lake Deposit: A New Copper-Cobalt-Gold VMS Discovery

The Fyre Lake volcanogenic massive sulphide (VMS) copper-cobalt-gold property is situated 160 kilometres northwest of Watson Lake in the Finlayson Lake area of the Yukon-Tanana Terrane. Columbia Gold Mines Ltd. conducted an integrated exploration program there between late June and early October, 1996.

The Fyre Lake property is underlain by a sequence of metamorphosed sedimentary and volcanic rocks known as the Layered Metamorphic Sequence (LMS). Copper-cobalt-gold VMS mineralization within the Kona Creek cirque area is hosted by deformed and metamorphosed chlorite-actinolite-quartz schist of the middle unit of the LMS which is interpreted to be a succession of basic to possibly intermediate flows with intercalated volcaniclastics and volcanically-derived fine-grained sedimentary rocks. These rocks are structurally overlain by a thick sequence of phyllitic metasedimentary rocks with a basal unit of micaceous quartz-chlorite-mica schist. The copper-cobalt-gold (± zinc, silver) VMS mineralization within the central portion of the Kona deposit occurs in three distinct horizons of massive to semi-massive sulphide and magnetite mineralization over a combined thickness of 70 to 80 metres, a continuous strike length of more than 1,000 metres and widths in excess of 100 metres.

The geological setting and mineralogy of the copper-cobalt-gold VMS mineralization within the Kona zone is that of a mafic, volcanic-hosted Besshi-type VMS deposit. The Fyre Lake contains copper-cobalt-gold mineralization with significant thickness, grade and continuity.

Organization: Government of Yukon | Gouvernement du Yukon
Stratigraphy, age, and petroleum potential of Upper Devonian black shale (unit 'Cf'), east Richardson Mountains and Peel Plateau, Yukon

Peel Plateau and the contiguous east flank of the Richardson Mountains, northeastern Yukon, comprise a relatively unexplored but prospective petroleum basin. Within the Devonian succession of this basin, shale rocks of unit ‘Cf’ are little known, but may have the potential to form an important conventional source and/or unconventional reservoir target. Unit ‘Cf’ is dominated by thick intervals of dark grey to black, siliceous, organic-rich marine shale, together with intercalated siltstone and very fine grained sandstone beds. Although unit ‘Cf’ has been mapped at surface on the eastern flank of the Richardson Mountains, it is not known whether it occurs to the east in the Peel Plateau and Plain subsurface. A correlation of this unit to the Ford Lake Shale (‘CF’ map unit), which occurs to the west in Eagle Plain and Kandik basins, has been implied.
In this study, unit ‘Cf’ was assessed for lithology, mineralogy, age and hydrocarbon source and reservoir rock potential, including type and quantity of organic matter and thermal maturity. Common organic geochemical analytical techniques were utilized (including Rock-Eval pyrolysis and optical microscopy), together with X-ray diffraction (XRD) to determine shale mineralogy and age determination by palynology. Outcrop characteristics were then utilized to identify unit ‘Cf’ in four subsurface Yukon wells: H-37, N-25, I-21 and A-42.


Organization: Government of Yukon | Gouvernement du Yukon
Mineral Assessment of the Eagle Plain Study Area, Yukon.

This report outlines the results and the conclusions of a study of the mineral potential of the Eagle Plains area. The accompanying mineral potential map ranks the different tracts according to their relative order of mineral potential, from highest to lowest. The highest ranking rocks occur on the flanks of the Richardson Anticlinorium which corresponds to the flanks of the southern Richardson Mountains.

Other contributions resulting from this study include: complete geochemical coverage of the area provided by a new Regional Geochemical Survey and reanalysis of silt samples of a pre-existing survey; the discovery of several new mineral occurrences; the discovery of rocks of possible volcanic origin, previously undocumented in the area; and modifications to the pre-existing geology maps.

Organization: Government of Yukon | Gouvernement du Yukon
2017–18 Supplementary estimates no. 1

Supplementary estimates no. 1 for the Government of Yukon 2017–18 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 2017, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
The Skukum Volcanic Complex, 105 D SW: Geology and comparison to the Bennett Lake Cauldron Complex

Several centres of continental volcanism are situated in southern Yukon. Two of these, the Skukum Volcanic Complex and the Bennett Lake Cauldron Complex BLCC are closely associated in space and gross geological characteristics, including their important role as hosts for epithermal precious metal mineralization. The BLCC was studied extensively by Lambert and the Skukum complex is currently under investigation by the author.

The Skukum complex was previously thought to represent a similar structural and volcanic setting to the BLCC. Study of the Skukum complex began in the summer of 1982 with the idea that it represented a cauldron subsidence feature and that an improved understanding of its geology would assist in developing potential targets for mineral exploration. The geology in the area is complex due to the discontinuous nature and incomplete exposure of volcanic units and is further complicated by severe faulting.

The author found that the Skukum complex differs from the BLCC in three respects:: 1) the presence of a bimodal suite of extrusive rocks (which suggests the tapping of two magma chambers), 2) its structural complexity and the absence of major cauldron subsidence and 3) the variability of depositional environments within the complex. Contrary to past speculation, the two complexes, which have been considered to be closely related in time and space, each represent a distinctive structural and volcanic setting.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary O-S isotopic compositions of Cretaceous granitoids in the Cassiar Platform and Selwyn Basin, Yukon and Northwest Territories

A regional stable isotopic study of Cretaceous granitoids (109-90 Ma) emplaced into miogeoclinal Cassiar Platform and Selwyn Basin rocks was undertaken to provide new insights into the origin of several plutonic suites (Cassiar, Hyland, Tay River, Tungsten, Mayo and Tombstone).

Organization: Government of Yukon | Gouvernement du Yukon
New mapping around the Slab iron oxide-copper-gold occurrence, Wernecke Mountains (parts of NTS 106C/13, 106D/16, 106E/1 and 106F/4), Yukon

Bedrock underlying the Slab iron oxide-copper-gold occurrence consists of fine-grained sedimentary rocks and schist of the Fairchild Lake Group (oldest unit of the Early Proterozoic Wernecke Supergroup), intermediate to mafic Slab volcanics, dioritic Bonnet Plume River Intrusions, and Early Proterozoic Wernecke Breccia that crosscuts all other units. The Wernecke Breccia was divided into two units: Type 1 and Type 2. Type 1 is limited in extent and consists of sedimentary and locally abundant massive magnetite clasts in a carbonate-magnetite matrix. Type 2 cuts Type 1 and comprises sedimentary clasts in a micro-breccia matrix. Iron oxide-copper-gold mineralization is associated with Wernecke Breccia. It occurs disseminated in quartz-carbonate veins cutting metasomatized sedimentary rocks, as sulphide veins that cut Type 1 breccia, as sulphide clasts in Type 2 breccia, as well as disseminated in the matrix of Type 2 breccia, and finally as sulphide veinlets crosscutting Type 2 breccia.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Mineral Exploration Program 2022 update

The Yukon Mineral Exploration Program (YMEP) is a Government of Yukon funding program designed to support individual prospectors, partnerships and companies. The funding supports placer and hard rock exploration projects by reimbursing a percentage of approved exploration expenditures. The program comprises four different modules of varying reimbursement rates and maximum funding limits: grassroots, target evaluation and focused regional for hard rock, and placer.

Organization: Government of Yukon | Gouvernement du Yukon
Report of 1982 field work on Early Tertiary clastics, west-central Yukon

Eight lithofacies types have been identified. These include: 1) Gms - massive, matrix support conglomerate; 2) Gm - massive or crudely bedded, clast supported conglomerate; 3) Sr - rippled sandstone; 4) Sp - planar crossbedded sandstone; 5) Sh - massive sandstone; 6) F1 - laminated sandstone, siltstone and mudstone; 7) Fsc - laminated or massive siltstone and mudstone; and 8) L - limestone. All lithofacies are present in the Sixtymile River area, but only lithofacies Sp, Sh and F1 were observed in the Grayling Creek area.

The eight types are grouped into four assemblages and are interpreted as: 1) Scott type braided river deposits; 2) Donjek type braided river deposits; 3) South Saskatchewan type braided river deposits; and 4) lacustrine deposits.

Lithofacies assemblages are arranged into at least ten fining-upward and thinning-upward megacycles reflecting a history of pulsed and rapid uplift in the source area.

Organization: Government of Yukon | Gouvernement du Yukon
2010–11 Supplementary estimates no. 2

Supplementary estimates no. 2 for the Government of Yukon 2010–11 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. February 2011, Whitehorse, Yukon.

Organization: Government of Yukon | Gouvernement du Yukon
Petrology and Tectonic Setting of Felsic and Mafic Volcanic and Intrusive Rocks in the Finlayson Lake Volcanic-hosted Massive Sulphide (VHMS) District, Yukon, Canada: A Record of mid-paleozoic Arc and Back-arc Magmatism and Metallogeny

The Yukon-Tanana Terrane (YTT) in the Finlayson Lake region (FLR), southeastern Yukon, Canada is host to five volcanic-hosted massive sulphide (VHMS) deposits (total -34 Mt) that have been discovered since the mid-1990's. In this thesis, field, lithogeochemical and Nd isotopic data are presented for felsic and mafic igneous rocks in the FLR to understand the tectonic setting, style of magmatism, and their relationships to VHMS mineralization. All rocks in the FLR were built upon a continental (or continent-derived) substrate of pre-Mississippian (>365 Ma) age. The Fire Lake unit (FLU) reflects Devonian-Mississippian (-365-360 Ma) arc and back-arc magmatism built upon a composite basement of oceanic and continental (or continent-derived) crust above an east-dipping subduction zone. Models proposed herein for the magmatic and tectonic evolution of FLU include: 1) arc magmatism punctuated by back-arc basin generation; 2) ridge propagation into an evolving arc with subsequent evolution to back-arc magmatism; and/or 3) ridge-subduction (slab-window) with eventual back-arc basin magmatism. The Kudz Ze Kayah (KZK) unit overlies the FLU and consists predominantly of crustally derived Devonian-Mississippian (-360-356 Ma) felsic volcanic and high-level subvolcanic rocks and variably carbonaceous sedimentary rocks; the latter are crosscut and overlain by alkalic mafic rocks. The high field strength element (HFSE)-enriched (A-type) felsic rocks and alkalic mafic rocks in the KZK unit are inferred to represent magmatism within an ensialic back-arc basin upon evolved crust. The Wolverine succession (WS) unconformably overlies the KZK unit and consists of a lower succession of felsic volcanic and subvolcanic rocks with carbonaceous sedimentary rocks; the upper portion of the succession, above the Wolverine VHMS deposit, consists predominantly of aphyric rhyolitic rocks that are overlain basalt flows. Felsic rocks ofthe WS are broadly similar to those in the KZK unit and represent ensialic back-arc basin magmatism. However, the succession is younger (-356-346 Ma), and post-dates a period of uplift, deformation, and erosion prior to commencement of back-arc magmatism. Back-arc spreading eventually evolved to true seafloor spreading within the WS. Massive sulphide deposits in the FLR are preferentially associated with rocks indicative of high temperature magmatism (e.g., boninites, A-type felsic rocks) and extensional tectonic activity (e.g., back-arc rifting and spreading).

Organization: Government of Yukon | Gouvernement du Yukon
Post-mining hydrogeochemical conditions, Brewery Creek gold deposit, central Yukon

A reconnaissance-level study of post-mining hydrogeochemical conditions was carried out at the Brewery Creek gold deposit within the Tintina Gold Province. The deposit is characterized byepizonal mineralization with a consistent arsenic-gold-mercury-antimony geochemical signature. Surface discharges and seeps in the area are naturally alkaline (pH=7.6-8.2), Ca-HCO3 ¯-SO4²¯ waters. Upstream from the recognized mineralization, waters contain <3 ¿g/L As and <1 ¿g/L Sb. Water samples immediately downstream from the ore bodies show maximum concentrations of 18 ¿g/L dissolved and 47 ¿g/L total arsenic, and 18 ¿g/L dissolved and 21 ¿g/L total antimony. Two kilometres below the mineralization, on lower Laura Creek, arsenic concentrations are diluted to background levels of <3 ¿g/L, and antimony levels are still slightly elevated at 9-10 ¿g/L. Comparison with hydrogeochemical data from Donlin Creek, an undeveloped epizonal deposit in Alaska, indicates that elevated concentrations of a few tens of ¿g/L arsenic and antimony are typical of waters draining such gold systems, regardless of their state of development. In addition to their usefulness for the construction of geoenvironmental models, these data also provide information for establishing exploration programs utilizing water sampling.

Organization: Government of Yukon | Gouvernement du Yukon
Ore mineralogy and formation conditions of vein and replacement-type Pb-Zn-Ag occurrences, Logan and YP properties, Rancheria District, Yukon, Canada

The Logan (MINFILE 105B 099) and YP (MINFILE 105B 001) zinc-lead-silver deposits are located in the Rancheria District, Yukon Territory. These deposits and numerous other occurrences occur in veins and breccia zones which cut clastic sedimentary rocks of Proterozoic and Palaeozoic age, along fracture zones cross-cutting Cretaceous granites and Eocene volcanic dykes of mafic and felsic composition, and form replacement bodies in Palaeozoic carbonates. At the Logan and YP deposits, four phases of mineralization can be distinguished. The main sulphide minerals are sphalerite, galena, pyrrhotite, pyrite, chalcopyrite and arsenopyrite. Silver is mostly confined to galena, but also occurs in tennantite-freibergite group minerals, stannite, Pb-Ag-Bi-sulphosalts of the matildite-galena series and lillianite homologues.

Arsenopyrite geothermometry using the method of Kretschmar and Scott (1976) returned maximum formation temperatures of 465° - 490° C at YP and 335° - 385°C at Logan. Microthermometric investigations of fluid inclusions in quartz associated with the YP mineralization showed formation pressures corresponding to a depth of 2500 m.

Fluid inclusion data from quartz suggest that mineralization at YP and Logan is caused by a mixture of magmatic and metamorphic fluids. The fluid inclusions have low salinities of 34 weight per cent NaCl equivalent, an unusally low value for fluids which have separated from acid magmas. The metamorphic fuids may have been derived from metamorphic dewatering of Palaeozoic sediments.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Placer Mining & Exploration 1985 to 1988

This volume is a compilation of two types of data: placer mining inspection reports and placer exploration assessment reports. Mining inspection reports were compiled from site visits conducted by the Placer Mining Inspection Unit from 1985 to 1988.

Assessment report summaries were written from placer assessment reports which were submitted for assessment credit. These placer exploration assessment reports were submitted to the Exploration and Geological Services Division between 1975 and 1988 and contain geological, geochemical or geophysical data which has not been previously published.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary observations on the geology of northeastern Glenlyon area, central Yukon (parts of NTS 105L/10, 14, 15)

Regional bedrock mapping has revised structural and stratigraphic relationships in the northeastern corner of the Glenlyon map area (NTS 105L). Three structural panels, separated by south and southwest dipping thrust faults, subdivide the area. Cambrian (?) to Ordovician metasedimentary and volcanic rocks underlie the southwestern panel and include all exposures southwest of the Duo fault. Ordovician to Silurian (?) siliciclastic and carbonate strata and phyllite units that are intruded by Late Devonian porphyritic rocks underlie the central panel. Silurian (?) to Triassic siliciclastic and carbonate strata in the northern panel occur to the north, and in the footwall of, the Twopete fault. Mid-Cretaceous granitic rocks that crop out near Kalzas Mountain and occur below the surface near Dromedary Mountain intrude the central and northern panels. Northeast-verging folds and thrust faults deform layered rocks in the northeastern Glenlyon area and are offset by north-south oriented, steeply dipping structures with both normal and strike-slip motion.
Upper Devonian Earn Group strata host layered sulphide bodies and polymetallic veins that contain lead, zinc and silver. This mineralization occurs in the footwall of the Twopete fault, a regional structure that originally developed as a Late Devonian synsedimentary fault.
Ordovician and Silurian (?) quartz-rich clastic rocks are unlike coeval basinal facies rocks mapped elsewhere within the Selwyn basin in Yukon. These rocks represent slope facies deposits that mark a transition from basin to platform that is the northern extension of the McEvoy platform–Selwyn basin boundary.

Organization: Government of Yukon | Gouvernement du Yukon