AndreaBozzo/ceres-open-data-index huggingface dataset:
The Wolf Discovery: A Kuroko-style volcanogenic massive sulphide deposit hosted by rift-related, alkaline felsic volcanic rocks

The Wolf property is situated approximately 90 km south of Ross River, Yukon, within the St. Cyr Range of the Pelly Mountains. The Pelly Mountains are bounded to the northeast by the Tintina Fault, the northern extension of the Rocky Mountain Trench.

Mineralization consists of a tabular body of massive sulphide, commonly with subordinate amounts of ferro-dolomite, and more rarely, barite. Sulphide minerals consist of pyrite, sphalerite and galena. Textures vary from very fine-grained massive pyrite with bands of amber sphalerite and steely-gray galena (zebra ore), to medium-grained botryoidal sphalerite and galena within a gangue of buff-coloured Fe-Mg carbonate. Chalcopyrite is conspicuous by its absence. The deposit has been intersected by nine drill holes over a strike length of 500 metres and a down-dip length of 250 metres. Thickness of the sulphide deposit varies from 2, to more than 25 metres. The deposit and host stratigraphy strike northwesterly and dip at 45 degrees to the southwest.

The deposit is hosted by a sequence of high-K trachyte flows, lapilli and crystal tuffs with minor epivolcaniclastic rocks. Sulphide mineralization and/or massive barite occurs in at least three separate stratigraphic levels within a 300- to 1000-metre-thick pile of felsic volcanic rocks.

Organization: Government of Yukon | Gouvernement du Yukon
A Transect Across Northern Stikinia: Geology of the Northern Whitehorse Map Area, Southern Yukon Territory (105D/13-16)

Results from the geological mapping of four 1:50 000 map areas (NTS 105D/13-16) north of Whitehorse are presented. The maps form a transect across the northern portion of Stikinia, an accreted terrane of uncertain origin. This bulletin establishes a stratigraphic nomenclature, and provides descriptions of 16 units of layered rocks that constitute Stikinia. Portions of the adjacent Cache Creek Terrane, Yukon-Tanana Terrane and the Coast Plutonic Complex are also represented and described. In addition, biostratigraphic and isotopic age constraints are provided for almost all of the units.
Stikinia is composed of several tectonic elements that indicate an episodic depositional history characteristic of an island arc environment. A newly discovered Late Paleozoic package, here call the Takhini assemblage, is defined, and represents the most northerly strata correlated as the Joe Mountain Formation. This enigmatic suite is Middle Triassic to Middle Jurassic sedimentary rocks are the fill of the marginal basin known as the Whitehorse Trough.
Strata of the Whitehorse Trough Supergroup include: clasts of deformed Takhini assemblage; deep-water sediments as old as Ladinian; igneous clasts with Permian and Late Triassic isotopic dates; extensive Norian carbonates containing Tethyan faunas and phylloidal algae; Jurassic ammonites that represent almost every ammonite zone as young as Bajocian; and a mixed Tethyan-Boreal Early Jurassic faunal assemblage. 
Plutonic rocks of the region are voluminous and, with the benefit of isotopic dates, can be divided into five plutonic suites (Long Lake, Teslin, Whitehorse, Mount McIntyre, Nisling Range), which record Early Jurassic, mid-Cretaceous and Early Tertiary magmatic epochs. Post-Triassic volcanic rocks are well dated and include the Early Jurassic Nordenskiö dacite, mid-Cretaceous Mount Nansen Group (Bying Creek volcanics), Late Cretaceous Carmacks Group and the Windy-Table suite (Open Creek volcanics).
Mineral Occurences include a number of small copper-gold skarns and gold-quartz veins. Mapping identifies several regions of favourable geology for these and other types of deposits, including carbonate (granodiorite intrusive contacts, faulted caldera margins, altered fault breccias and quartz-rich rhyolite dykes.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary assessment of aggregate potential in Peel River basin (including parts of 106E, 106F, 106K, 106L, 116H and 116I).

The Peel Basin aggregate potential study was initiated to provide an increased understanding of potential aggregate resources in the Peel River watershed. An improved understanding of regional aggregate potential will enhance project viability and encourage exploration investment in the Peel Watershed. The aim of this study was to remotely assess broad regions of the Peel River basin in Yukon for potential sources of aggregate materials.

Organization: Government of Yukon | Gouvernement du Yukon
Tectonometamorphic evolution of the Kluane metamorphic assemblage, southwest Yukon: evidence for Late Cretaceous eastward subduction of oceanic crust underneath North America

A copy of this thesis is available at the EMR library – QE195.M3 1997.
This thesis is available online at https://doi.org/10.7939/R3DJ58N76.

Organization: Government of Yukon | Gouvernement du Yukon
Stewart River Placer Project station location map, portions of NTS Sheets 116B&C and 115N&O (1:250,000 scale)

Station locations mainly represent visits to active and abandoned placer mines, although several stations are established at natural gravel exposures. Information collected at stations utilized a three-page field report form that includes: 1) station location data; 2) a stratigraphic section; and 3) a panel diagram.

Organization: Government of Yukon | Gouvernement du Yukon
Structural settings and geochemistry of the Cynthia gold prospect, Tintina Gold Belt, Hess River area (105O/6), Yukon

The Cynthia property overlies a large (greater than 2x2 km) area of gold mineralization related to a Cretaceous Tombstone Suite quartz monzonite intrusive body. The mineralization is controlled by two district-scale fault zones and is especially intensive in the area of their intersection, located above and adjacent to the intrusive body. These larger structures host abundant gold-bearing massive and drusy quartz and chalcedony veins, zones of intense stockwork and strong brecciation, as well as numerous mineralized felsic dykes.
The gold grades within the mineralized structures are commonly in the range of 200 ppb to 2.0-3.0 g/t Au, with higher (up to 16 g/t Au) values attributed to the fault intersection area. Multi-staged gold mineralization found in the quartz veins, stockwork and altered dykes is associated with sulphide minerals (mainly pyrite and arsenopyrite) and elevated As, Bi and Ag values. A later mineralizing episode produced sulphide mineral-bearing chalcedony and drusy quartz veins, with gold concentrations accompanied by elevated Sb, Hg, Ag and Pb values, indicating the affi nity of epithermal style gold mineralization.
The property is considered to represent a bulk-tonnage exploration target, with potential of the structures to host a major gold deposit. During the 2002 exploration program, the prospect has been advanced to a drill-ready stage.

Organization: Government of Yukon | Gouvernement du Yukon
Preliminary Geology of Fenwick Creek (105D/3) & Alligator Lake (105D/6) Map Areas

Fenwick Creek (105D/3) and Alligator Lake (105D/6) map areas, located southwest of Whitehorse, Yukon, were mapped at 1:50,000 scale during the 1987 field season. The map areas are within the Teslin Plateau and the Boundary Ranges physiographic regions.

Cretaceous Coast Plutonic Complex and Upper Triassic volcanic and sedimentary rocks of the Whitehorse Trough are separated by the 40 km long 140° trending "Tally-Ho Shear Zone." East of the shear zone, limestone containing late Upper Trassic conodonts is interbedded with volcanics previously mapped as Mesozoic volcanics, and now considered part of the Lewes River Group.

Mount Skukum and Bennett Lake are two Eocene volcanic complexes in the map area. The volcanic stratigraphy of the Skukum Complex has been reinterpreted and a number of previously unreported rhyolite porphyry plugs and related flows were mapped in other areas outside the main volcanic complexes.

U-Pb age dating of zircon concentrates from three plutons was completed. Megacrystic feldspar granodiorite, dated at 220 ± 5 Ma, intrudes the Lewes River Group volcanics. The granodiorite forms a regionally extensive northwest trending late Triassic batholith and is interpreted as the plutonic root of the Lewes River Arc. The Ibex Alaskite, a high level discordant pluton that intrudes late Cretaceous (?) felsic volcanics is 58 ± 1Ma. Mt. Anderson granite-granodiiorite is 119 ± 5 Ma.

Three types of mineral occurrences have been recognized in the area: 1. epithermal gold-silver veins; 2. silver-antimony ± gold veins; and 3. gold-silver telluride veins. Epothermal gold-silver veins in faults cutting late Triassic to Tertiary granites and the gold-silver-telluride veins are spatially related to the "Tally-Ho Shear Zone."

Organization: Government of Yukon | Gouvernement du Yukon
An appraisal of Devonian-Mississippian shale strata in Yukon’s Liard basin

This study presents the first shale gas appraisal of Devonian-Mississippian shale strata in Yukon’s Liard basin. Assessed volumes of 68 Tcf gas-in-place and 7.6 Tcf marketable gas are contained within two shale plays identified from an integrated wireline log and geochemical evaluation: the Devonian (Givetian-Frasnian) Horn River shale and the Devonian-Mississippian (Famennian-Tournaisian) Exshaw-Patry shale. Average burial depths of 3018 mTVD and net pay thicknesses of 73 m for the Horn River, and 2688 mTVD and 89 m for the Exshaw-Patry plays are interpreted. Both plays are dominated by black, organic-rich, siliceous mudstones, and exhibit: elevated TOC contents (0.6-6.9 wt %); maturities within or past the dry gas window (2.1-4.6 %Ro); very high biogenic silica proportions (averaging 80.2-90.3%); high mineralogical stiffness (0.80-0.87); and average porosities of 1.2% for the Horn River and 4.2% for the Exshaw-Patry play. Resource distribution models indicate 50% of Yukon’s marketable gas will be found in 30% of its assessed area, with the best potential for significant volumes located in the very southeast of the territory where play depth and thickness increases.

Organization: Government of Yukon | Gouvernement du Yukon
Surficial Geological Map of the Yukon River and Sixtymile River valleys (parts of 115O/5, 12 and 115N/9), western Yukon

Surficial geological map (1:50,000 scale) of the Yukon and Sixtymile river valleys (parts of 115O/5, 12 and 115 N/9), western Yukon, including marginal notes on surficial geology, geomorphology and placer occurrences.

Organization: Government of Yukon | Gouvernement du Yukon
A summary report on the geology of the Brown-McDade gold-silver deposit, Mount Nansen mine area, Yukon

The Brown-McDade deposit was the first vein system discovered in the Mount Nansen camp and has produced approximately 34,000 ounces (1058 kg) of gold and 131,000 ounces (4,075 kg) of silver from 225,000 metric tonnes of ore since production began in November, 1996. Production rates have varied since the mill start-up but the carbon-in-leach (CIL) plant is currently operating near capacity at 700 metric tonnes per day.

Mining at the Brown-McDade open pit has exposed two separate and distinct deposit types. The first type is gold-silver vein mineralization hosted by a massive feldspar porphyry dyke. These fine-grained quartz-sulphide veins and vein breccia are enclosed by silicified and/or intensely clay-altered brecciated feldspar porphyry. The feldspar porphyry dyke has intruded along an igneous-metamorphic contact that has been mined over a strike length of 50 m in the southern portion of the pit. The second deposit type that occurs at the north end of the pit consists of a siliceous, sulphide-rich breccia in a pipe-like structure hosted by metamorphosed carbonate and clastic rocks of the Nasina Assemblage. The pipe is elongate in plan with a high-grade core approximately 15 m wide and 25 m long surrounded by a low-grade envelope consisting of quartz-sulphide stringers in a silicified breccia. The deposits are separated by a northeast-striking fault which truncates and offsets the main vein-dyke mineralization.

The ore is composed of fine-grained quartz and sulphides in narrow veins or as matrix to a breccia of silicified and pyritized wall rock fragments. Unoxidized ore contains dark grey silica and pyrite, arsenopyrite, sphalerite, galena, sulphosalts, bornite, stibnite and chalcopyrite. Gold is genetically related to the pyrite phase of the mineralization and occurs as 5 to 50 micron-sized inclusions in pyrite grains. Oxidation of sulphide minerals extends to depths of up to 70 m and a large portion of the gold grains have been exposed by oxidation of the sulphides and post-depositional cataclastic fractures in the pyrite. The silver mineralogy is not as well understood but appears to be related to the base metal sulphide mineralization.

Organization: Government of Yukon | Gouvernement du Yukon
Geology and Mineral Occurrences of Slats Creek, Fairchild Lake and "Dolores Creek" Areas, Wernecke Mountains (106D/16, 106C/13, 106C/14), Yukon Territory

The study area provides a clear record of the Proterozoic geological evolution of northern and central Yukon Territory. The area lies in the Wernecke Mountains of east-central Yukon, approximately 150 km north-northeast of the town of Mayo, and 20 km west of the Yukon-Northwest Territories border. The rocks record events of sedimentation, magmatism and deformation ranging in age from Early Proterozoic to Tertiary. Rocks of Early Proterozoic age predominate, but strata of Middle Proterozoic, Late Proterozoic, and Early Paleozoic ages are also abundant.

Organization: Government of Yukon | Gouvernement du Yukon
Compositional studies of placer and lode gold from western Yukon: implications for lode sources

On-going compositional studies of gold from placer and lode deposits and occurrences in western Yukon provide new insights into their nature and origin. Two main compositional populations are present in placer and lode deposits in the Klondike District. The dominant population has high fineness and low mercury content, and appears to be mainly derived from lode sources in the Lone Star, King Solomon Dome and lower Gold Run Creek areas. A second population of low fineness, high-mercury-content gold is derived from lode sources on the left limit of Eldorado Creek and in the headwaters of Bear and Last Chance creeks. Placer gold in the Sixtymile District was not derived from epithermal vein occurrences like those in the Sixtymile River valley but rather has compositions more similar to Klondike-type metamorphogenic veins. Placer gold in Scroggie Creek in southern Stewart River map area appears to be derived from intrusion-related vein occurrences.

Organization: Government of Yukon | Gouvernement du Yukon
First vertical derivative of the magnetic field, Wernecke Mountain Aeromagnetic Survey, NTS 106F (south half), Yukon.

This map of the first vertical derivative of the magnetic field was derived from data acquired during an aeromagnetic survey carried out by Fugro Airborne Surveys during the period April 17, 2006 to August 26, 2007. The data were recorded using a split-beam cesium vapour magnetometer (sensitivity = 0.005 nT) mounted in the tail boom of a Cessna Caravan aircraft. The nominal traverse and control line spacings were, respectively, 800 m and 2 600 m, and the aircraft flew at a nominal terrain clearance of 250 m. Traverse lines were oriented N30degreesE with orthogonal control lines. The flight path was recovered following post-flight differential corrections to the raw Global Positioning System data and inspection of ground images recorded by a vertically-mounted video camera. The survey was flown on a pre-determined flight surface to minimize differences in magnetic values at the intersections of control and traverse lines. These differences were computer-analysed to obtain a mutually levelled set of flight-line magnetic data. The levelled values were then interpolated to a 200 m grid. The International Geomagnetic Reference Field was not removed from the magnetic total field.

The first vertical derivative of the magnetic field is the rate of change of the magnetic field in the vertical direction. Computation of the first vertical derivative removes long-wavelength features of the magnetic field and significantly improves the resolution of closely spaced and superposed anomalies. A property of first vertical derivative maps is the coincidence of the zero-value contour with vertical contacts at high magnetic latitudes (Hood, 1965).

Organization: Government of Yukon | Gouvernement du Yukon
New results on the stratigraphy and placer gold potential of Indian River, Dawson, central Yukon

Most of the historic placer gold recovered from the Indian River has been from the modern river gravel; however, a significant amount of placer gold has been mined from older deposits, including low-level, intermediate-level and high-level gravel terraces.
Significant placer gold reserves exist in Indian River drainage in various forms. Prospective targets include 1) modern (Holocene) alluvial channels, alluvial fans and tributary gulches; 2) modern (Holocene) low-level buried and/or abandoned alluvial terraces; 3) early to late Pleistocene intermediate-level buried abandoned terraces and alluvial fans; 4) early Pleistocene (pre-Reid) glaciofluvial gravel sequences; 5) Pliocene high-level alluvial terraces (White Channel gravel); and 6) technogenic (tailings) deposits.
Fine-grained placer gold existing in size ranges not recovered efficiently by conventional sluicing operations has been found in alluvial and glaciofluvial gravel and tailings deposits. These deposits may represent an important resource and any future mining operations must address the metallurgical implications to maximize recovery.

Organization: Government of Yukon | Gouvernement du Yukon
Pressure data assessment, Liard Basin, Yukon

Ikon Science Canada conducted a preliminary scoping study of shale gas play data from Yukon’s portion of Liard Basin to determine any potential for future assessment of pore pressure variability in the basin to be undertaken or contracted out by YGS at a later date. The study was a desk-top synthesis of existing, publicly-available geological and petrophysical data; no new data were collected as part of this project.

Organization: Government of Yukon | Gouvernement du Yukon
Epigenetic mineral deposits of the Ketza-Seagull district, Yukon

Most epigenetic occurrences of gold and silver in the Pelly Mountains of central Yukon form two adjacent clusters at the headwaters of the Ketza River and Seagull Creek. The origin of these deposits has never been clear because they have been scarcely studied. Many are in Mississippian volcanic and intrusive rocks to which some have been attributed, and none are clearly associated with Mesozoic intrusions.

This paper summarizes the characteristics of the deposits in this district which are probably epigenetic, and presents evidence that they are related to a domal uplift here named the Ketza-Seagull Arch, and to one or more buried Cretaceous intrusions.

Organization: Government of Yukon | Gouvernement du Yukon
U-Pb zircon geochronology from a Late Triassic pluton in the Mount Nansen area

This report presents the geochronology results for one sample from a Late Triassic Pyroxene Mountain pluton collected in the Mount Nansen area and analyzed for U-Pb zircon dating at Boise State University. These data complement the large dataset released in the Atlas of Sack et al. (2020).

Organization: Government of Yukon | Gouvernement du Yukon
Geology and geochemistry of the Clear Creek gold occurrences, Tombstone gold belt, central Yukon Territory

Auriferous sheeted quartz veins and silicified shear zones occur along the margins and within adjacent hornfels zones of mid-Cretaceous Tombstone intrusions near the head of Clear Creek in the central Yukon. The lodes are the source for more than 120,000 ounces of downstream placer gold production. These lodes contain variable amounts pyrrhotite, pyrite, and arsenopyrite, with less abundant scheelite - alkali-feldspar, muscovite, biotite and tourmaline are common gangue phases. Grab samples of mineralization often contain gold grades in excess of 1 ounce per ton. Gold-to-silver ratios vary most commonly from 1:1 to 5:1. Gold-rich quartz veins cut all stocks, adjacent hornfels and associated lamprophyre dykes commonly contain greater than 1% arsenic. Bismuth, and less consistently tungsten and stibnite, characterize many of the most highly mineralized veins within and surrounding the stocks. Quartz veins along the intrusive-metasedimentary rock contact around the Pukelman stock are also enriched in lead and silver.

R-mode factor analysis of multi-element geochemical data for 111 gold- and sulphide-bearing rock samples indicates that there are two geochemically distinct metal suites in the Clear Creek occurrences. The first is characterized by As-Au-Bi ± Sb, Te ore-related mineral association, which is typical of many intrusion-related deposits in the Tombstone gold belt. Less consistently, anomalous concentrations of Ag, Co, Cu, Fe, and Mo occur within these auriferous rocks. The second metal factor is defined by Ag-Bi-Pb ± As, Au and Te. It characterizes metalliferous vein samples that have uncommonly low Au: Ag ratios and may represent a second hydrothermal episode. Tungsten shows little consistent correlation with the metalliferous veins in either element suite.

Organization: Government of Yukon | Gouvernement du Yukon
Ancient Pacific Margin - An update on stratigraphic comparison of potential volcanogenic massive sulphide-hosting successions of Yukon-Tanana Terrane, northern British Columbia and Yukon

Now in its second year, the Ancient Pacific Margin National Mapping (NATMAP) project continues to make progress in elucidating the stratigraphic framework of Yukon-Tanana Terrane of northern British Columbia and Yukon. Updated composite stratigraphic sections for the Finlayson Lake district, Glenlyon, Wolf Lake and Jennings River areas, and from previous studies in the Aishihik Lake area and northern Dawson Range, show that Yukon-Tanana Terrane originated as a dynamic mid- to late Paleozoic (pericratonic) arc system. The evolution of this arc system was punctuated by arc-building events, arc rifting and development of back-arc basins, and episodes of contractional deformation between Late Devonian and early Pennsylvanian. Its development terminated in late Pennsylvanian time with the opening of a marginal basin and the subsequent mid-Permian calc-alkaline volcanism, high-pressure metamorphism and regional deformation of the terrane.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Placer Mining Industry 1993 to 1994

This report documents the state of the Placer Mining Industry in the Yukon Territory for the 1993 and 1994 mining seasons. This report differs from previous volumes in that the placer mining inspection reports are organized by drainage basin.

The majority of this volume consists of detailed descriptions of placer operations visited by the staff of the Placer Mining Section of the Mineral Development Division, Northern Affairs Program, Yukon Region. Also included is information that may be useful to readers who are interested in searching for and developing placer properties in the Yukon Territory.

This volume contains four papers of general interest: "Prehistoric gold" describes the discovery of an extinct Ice Age horse; "Water" is a brief account that tells of the difficulties, historically, in obtaining water for placer mining; "Oldest valid Yukon placer claims" describes claims kept in good standing for the greatest length of time; and "The early development of placer mining in the Yukon 1873-1896" is a historical overview of the development of placer mining in the Yukon.

Organization: Government of Yukon | Gouvernement du Yukon