AndreaBozzo/ceres-open-data-index huggingface dataset:
Geochemistry of bedrock and soils in the vicinity of the Anvil Mine, Yukon Territory

Cambrian (?) schist and phyllite of the Anvil Range, Yukon, host three large stratabound lead-zinc deposits: Faro, Vangorda, and Swim. Because geological exploration is limited by a thick cover of glacial overburden, geochemical techniques were tested in the area. These include bedrock sampling for primary halos and geochemical marker horizons, and glacial overburden sampling for secondary dispersion patterns. Multi-element geochemistry of bedrock indicates that the schist and phyllite are not distinctive in one or any combination of the trace elements analyzed. However, some younger rocks are enhanced in various elements: amphibolite in Ni, Cr, Co, and Cu; rhyolite in Pb and Sn; and granite in Sn. Despite presence of glacial overburden, the trace element content of bedrock is reflected in soils. Soils overlying magnetic greenstones are enriched in Ni and Cu, whereas soils overlying granite are slightly enriched in Sn content. Detailed bedrock, overburden and soil sampling at the Faro deposit reveals that primary Pb, Zn, Mo, and Ba halos exist about the ore zone. Mo parallels the visible alteration envelope, but Pb and Zn extend into the hanging wall and the footwall. Ba extends into the hanging wall but is not detected in the footwall. Secondary dispersion patterns are primarily related to the proximity of the Faro ore zone and type of parent material sampled. Till deposits have higher background and threshold values for Cu, Pb, and Zn than those of glaciofluvial deposits. Bath Pb and Zn distributions in overburden delineate the Faro #2 ore body; Zn extends to surface whereas Pb, in some cases, does not. This is a reflection of the type of overburden sampled. In general, Zn is the more consistent indicator of ore. The Zn anomaly is primarily hydromorphic in origin, cxZn having higher anomalous/threshold contrast than total Zn (11.1 for cxZn vs 4.8 for total Zn). The nature of the Pb anomaly is not understood.

This thesis is available online at https://open.library.ubc.ca/cIRcle/collections/ubctheses/831/items/1.0302661. A copy of this thesis is available at the EMR library – TN27.Y8 M677.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Exploration 1990

Yukon Exploration 1990 consists of three parts: Part A is a comprehensive overview of mining and exploration activity in Yukon; Part B summarizes the activities of the Exploration and Geological Services Division (EGSD) of the Northern Affairs Program, Yukon Region; and Part C documents significant new or previously unpublished information based on property visits by EGSD staff.

The descriptions in Part C also include information from open assessment reports and other documents. Each paper in Part C is searchable as a separate metadata record.

Organization: Government of Yukon | Gouvernement du Yukon
Aboriginal Participation in the Mining Industry of Canada 1996

In August 1989, the Intergovernmental Working Group on the Mineral Industry (IGWG) formed a Sub-committee to study all aspects of Native participation in the mining industry in Canada.

Over the last six years, the Sub-committee's annual reports have addressed many aspects of Aboriginal participation in mining, emphasized "best practices", and provided guides for both Aboriginal communities and mineral industry to foster increased participation of Aboriginal people in the Canadian mining industry.

This report outlines some of the more important findings of the Sub-committee. A list of the members of the Sub-committee and a guide to the contents of the six annual reports are included in this document as Appendices 1 and 2, respectively.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon placer mining 2019 development and exploration overview

The Yukon placer mining industry recorded strong production in 2019. This was largely due to favourable gold prices, coupled with a beneficial exchange rate, which resulted in high selling prices during most of the summer. The industry also benefited from an early start to the season due to warm early spring temperatures. Shifts in regional production values reflect movement of certain large operations to both new and historic locations. The shift reflects permitting challenges in the Indian River, as well as the need to discover and develop new deposits based on diminishing resources within specific claim holdings.

Placer gold production, according to export tax reporting at the time of publication, was 75,228 crude ounces and valued at $116M¿CDN. The 2019 production value was nearly $27M¿CDN greater than that of 2018, largely owing to a favourable gold price that averaged more than $1900¿CDN/fine ounce throughout much of the mining season. This was nearly $400¿CDN/fine ounce more than the average 2018 gold price. When accounting for inflation, the 2019 production value is the highest value since 1988.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Placer Mining Industry 2007-2009

This publication contains summaries of placer mining operations active between 2007 and 2009. Although formatted, summaries have not been edited for this publication. The maps were generated from an ArcGIS digital compilation, which was converted into a publishable format through Adobe Illustrator. Information about the active placer operations and related geology was derived from survey forms which were completed by placer miners, and from field visits. Although we have made our best efforts to include all active operations and to be as accurate as possible, there may be some omissions and errors and we apologize for those. Summaries are arranged in sections by drainage basin, with corresponding maps and photos included.

Organization: Government of Yukon | Gouvernement du Yukon
Structure and stratigraphy of the Marg volcanogenic massive sulphide deposit, north-central Yukon

The Marg (Cu-Zn-Pb-Au-Ag) volcanogenic massive sulphide deposit is hosted within metasedimentary and metavolcanic rocks of the Devonian-Mississippian Earn Group and Mississippian Keno Hill Quartzite. These rocks form part of the Selwyn Basin, an off-shelf sequence that developed at the continental margin prior to Cordilleran deformation and accretion.

Geological mapping and re-analysis of drill core was completed to re-assess the deposit and property-scale economic potential. The Marg deposit is deformed by at least three generations of structures that developed during Late Jurassic to Early Cretaceous time and are geometrically correlative with regional-scale structures such as the Robert Service Thrust and the Tombstone strain zone. The Marg deposit occurs within a southeasterly plunging, complex fold structure, a significant part of which has been removed by erosion.

Discovery of additional stratigraphy comparable to the Marg sequence and new sulphide occurrences within the claims underscores both property and regional exploration potential. The presence of probable rift-related volcanism and mineralization within the Selwyn Basin, and the similarities of this mineralization to that within 'suspect' terranes, has implications for both regional tectonics and exploration.

Organization: Government of Yukon | Gouvernement du Yukon
Biostratigraphy of the Lower to Middle Jurassic Laberge Group, Whitehorse Map Area (105D), Southern Yukon

New ammonite collections from fine-grained rocks of the Laberge Group in the Whitehorse area are assigned nine ammonite zones or assemblages using the recently established North American regional zonations. Guide ammonites of these zones are illustrated. Supplemented by other published and critically revised data, the Laberge Group in the southern Yukon is shown to contain nearly all zones of the Upper Sinemurian to Lower Bajocian stages. The presence of the Hettangian and Lower Sinemurian is not adequately confirmed. In an Upper Pliensbachian section in the Miners Range, the occurrences of Fontanelliceras cf. fontanellense and Canavaria? sp. extend the known range of these taxa in North America to the Carlottense Zone. The base of the Toarcian is marked by the first appearance of Dactylioceras ex gr. simplex, which may characterize the deepest faunal level within the Kanense Zone. Another section on Goat Mountain contains a Lower to Middle Toarcian succession.

Deposition of the Laberge Group continued throughout Early and Middle Jurassic time. Conglomerates are confined to Upper Sinemurian to Upper Pliensbachian in the Takhini area and to Toarcian and older in the Fish Lake area. It is likely that Laberge Group conglomerate was not deposited in response to a single episode of relative sea level change, but to several such events during Early Jurassic time. Fine-grained clastics are Upper Sinemurian to lowermost Toarcian in the Takhini area whereas Lower Toarcian to Lower Bajocian in the Fish Lake area. Dacite tuff of the Nordenskiold formation is Late Pliensbachian in age.

Organization: Government of Yukon | Gouvernement du Yukon
Cryostratigraphic record of permafrost degradation and recovery following historic surface disturbances, Klondike area, Yukon

Cryostratigraphic investigation of near-surface permafrost at a site in the southern Klondike goldfields has revealed three ages of permafrost disturbance and recovery which potentially span the last century. In an undisturbed forest, the base of the modern active layer is stable with a suspended ice/sediment cryofacies at the contact. A recently burned site (2004) shows that the degrading contact has not yet stabilized. An earlier disturbance from the 1970s shows evidence of aggradation (upward shift) of the permafrost table following limited vegetation succession. Underlying all three sites is an older disturbance corresponding to a thaw depth of ~2 m, predating the 1970s disturbance; it is likely that this represents an early 20th century disturbance associated with the deforestation of the valley during the gold rush era. Permafrost has recovered significantly since that time as the boreal forest and understory vegetation was re-established, underscoring the role of vegetation cover in permafrost disturbance and recovery.

Organization: Government of Yukon | Gouvernement du Yukon
Granitic rocks and associated mineral deposits of the Whitehorse Map-Area, Yukon Territory

This report demonstrates that the stratigraphic, compositional and textural data are sufficient to easily distinguish the four major granitic rock types in the area. This is an essential first step in exploration for intrusion-related mineral occurrences since the known occurrences are associated with only two of the four granitic rock types.

The four granitic rock types distinguished are: Mid-Jurassic pink quartz monzonite, Mid-Cretaceous biotite quartz monzonite, Upper Triassic-Lower Jurassic hornblende granodiorite, and Lower Tertiary smoky quartz granites. The latter two intrusives are associated with significant mineralization.

The copper-iron skarn deposits in Upper Triassic banded limestone are associated with Upper Triassic granodiorite. The nature of the Upper Triassic granodiorite distinguishes it from porphyry copper-bearing granitic rocks of similar age in British Columbia. The Upper Triassic granodiorite batholiths in the Yukon Crystalline Terrane are not a good prospect for porphyry-type mineralization. The polymetallic nature and the alteration associated with the Lower Tertiary subvolcanic rocks suggest they have good potential for porphyry copper mineralization of the Casino type.

Organization: Government of Yukon | Gouvernement du Yukon
Regional stream sediment geochemical data, Stewart River area, western Yukon (NTS 115N east & 115O)

This data package contains results for parts of the Stewart River area (NTS 115N east and 115O). This information has been provided in a variety of digital formats. PDF files include survey descriptions and details regarding methods, analytical data listings and summary statistics. Raw digital data of original field and analytical information plus new reanalysis results are included in Microsoft®Excel (XLS) format.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon placer mining 2020 development and exploration overview

The COVID-19 pandemic and associated economic recession has had a profound impact on Canada and the world. In Yukon, the tourism industry nearly vanished overnight as flights and RV traffic were reduced to a trickle. Fortunately, gold mining was given an essential service “green light” to continue, amid strict protocols to control the spread of the virus. The industry responded with an incredible year of production, spurred on by high gold prices and low fuel costs. This scenario, where gold mining provided a safe haven and economic opportunity during global hard times, has played out before in Canadian history. The great depression of the late 1800s contributed significantly to interest in the Klondike Gold Rush, the dirty 1930s saw a resurgence in placer gold mining in Yukon, and similarly, the recession of the early 1980s kick started the modern era of placer gold mining in the territory. The story of the 2020 pandemic is no different, highlighting the value of economic diversification and ability of a remote northern industry to contribute new wealth to a nation when it is needed most.

Organization: Government of Yukon | Gouvernement du Yukon
U-Pb zircon ages for the Nordenskiold formation (Laberge Group) and Cretaceous intrusive rocks, Whitehorse trough, Yukon.

We report here the results of U-Pb zircon analyses for samples collected during regional mapping of the northern Whitehorse trough. Three samples of the Nordenskiold formation, a crystal-rich volcaniclastic unit that occurs at several stratigraphic horizons in the Laberge Group, yielded concordant U-Pb zircon ages of 188.1 ± 0.4 Ma, 187.2 ± 0.4 Ma and 186.5 ± 0.3 Ma, respectively. These results clearly indicate multiple eruptive events rather than recycling of the volcaniclastic material. Zircons from a thin layer of ash tuff in the Tanglefoot formation (Laberge Group) yielded a concordant U-Pb age of 187.1 ± 0.7 Ma, confirming correlation with the Nordenskiold formation. A sample of porphyritic granite from the only pluton intruding the northern Whitehorse trough, near Carmacks, yielded a concordant U-Pb zircon age of 112.8 ± 0.2 Ma, whereas a precise age could not be resolved from zircons extracted from a porphyry dyke intruding the Tantalus Formation in the southern Whitehorse trough.

Organization: Government of Yukon | Gouvernement du Yukon
Biotite chemistry of the Casino porphyry Cu-Mo-Au occurrence, Dawson Range, Yukon

Biotites from hydrothermal alteration zones of the Casino porphyry Cu-Mo-Au deposit have a chemical composition that is distinct from biotites of the unaltered Dawson Range Batholith and Casino Plutonic Suite. Biotites from potassic, phyllic, and propylitic alteration zones contain distinctly higher XMg (XMg = Mg/(Mg+Fe)) values than biotites from the unaltered country rocks. The XMg values are positively correlated with Ti, F, Cl, Si, and negatively correlated with Al, Fe, Mn, Ba contents. The XF/XOH (X = mole fraction) values are positively correlated with XMg/XFe values and describe a positive linear trend from propylitic, to potassic, to phyllic zones. The distinct XMg, Ti, F, Cl, Al, Fe, Mn, and XF/XOH and XMg/XFe compositions of biotites from alteration zones may prove to be useful in understanding the evolution of fluid chemistry, and the identification of alteration zones in porphyry copper systems in the Dawson Range.

Organization: Government of Yukon | Gouvernement du Yukon
Mod Property, VMS Mineralization in the Western Part of the Yukon-Tanana terrane? (Yukon MINFILE 105B 028, 029, 031)

Base metal-silver prospects have been known to exist in the upper Swift River region since 1946. These prospects, occurring in Yukon-Tanana terrane, have been previously described as isolated skarn occurrences and have hitherto received limited prospecting attention. Exploration work at the Mod property in 2016 has indicated that the sulphide mineralization is deformed (hence it predates the adjacent Cretaceous Seagull batholith) and that it demonstrates textures that are not consistent with a skarn origin. If, indeed, this mineralization is of exhalative origin then a large region of Yukon-Tanana terrane becomes prospective for mineralization similar to that of the Finlayson VMS district.

Organization: Government of Yukon | Gouvernement du Yukon
Stratigraphic framework for syngenetic mineral occurrences, Yukon-Tanana Terrane south of Finlayson lake: A progress report

Yukon-Tanana Terrane in Grass Lakes map area south of Finlayson Lake consists of highly deformed though regionally mappable metasedimentary and metavolcanic rocks. Four newly revised map units and various subunits have been traced throughout the area. These include unit 1, a quartz-rich metaclastic unit with felsic metavolcanic rocks at its lowest exposed level and a middle calcareous marker; unit 2, a mafic metavolcanic unit with lesser carbonaceous metasedimentary rocks; unit 3, a carbonaceous phyllite and quartzite and felsic metavolcanic unit, and unit 4, an upper unit of carbonaceous phyllite, mafic metavolcanic rocks and coarse-grained quartzofeldspathic metaclastic rocks. Units 2 and 4 have been redefined from a previous report based on new observations and a consideration of the provenance of coarse-grained quartzofeldspathic metaconglomerates now included in unit 4. In the current interpretation, the metaconglomerate-bearing strata north of and overlying the felsic meta-volcanic rocks hosting Kudz Ze Kayah are considered to unconformably overlie them.

Three of these map units are associated with mineral occurrences or deposits. Rusty, locally malachite-stained muscovite-quartz schist at Arcturus Resources' First Base claims and Expatriate Resources' Blue Line and Winger claims belong to the felsic metavolcanic part of unit 1. Columbia Gold's Fyre Lake deposit is hosted in unit 2 mafic metavolcanic rocks, possibly associated with a synvolcanic fault. Cominco's Kudz Ze Kayah deposit occurs in unit 3 felsic metavolcanic rocks. Gossans on Cominco's Cobb claims, Expatriate's Overtime and NHL claims, and Atna/Westmin's Pack claims and anomalous copper in soils at Arcturus' Bas claims are also spatially associated with this unit.

Organization: Government of Yukon | Gouvernement du Yukon
Geology, alteration, and mineralization of the Carlin-type Conrad zone, Yukon

The Conrad zone, east-central Yukon is a newly discovered gold prospect. It is strongly analogous to Carlin-type mineralization, and represents the first Carlin-type gold deposit discovered in Yukon. The regional geological framework and style of mineralization bear similarities to the Carlin trend in Nevada. Structurally, the Conrad area is bounded to the south by the regional-scale Dawson thrust and the Kathleen Lakes fault to the north. This structural setting lies at the interface between the dominantly clastic Neoproterozoic to Paleozoic rocks of Selwyn basin and coeval carbonate rocks of Mackenzie platform. The principal host rock to mineralization is a variably decarbonatized silty limestone, although where permeability has been enhanced by shearing, siliciclastic rocks may also contain significant amounts of gold. Alteration and associated processes related to mineralization include decarbonatization of host limestone with subsequent silicification and brecciation. Gold is hosted within arsenic-rich pyrite growth rims around pre-existing pyrite. Significant post-mineralization realgar, orpiment, calcite, and trace stibnite are found locally as open-space minerals.

Organization: Government of Yukon | Gouvernement du Yukon
Alteration zonation, veining and mineralization associated with the Wernecke Breccias at Slab Creek, Yukon Territory, Canada

Detailed vertical-face mapping of 'Slab Creek' was carried out in the summer of 2001 to evaluate the relations of Wernecke Breccia bodies with alteration, veining and iron oxide-copper-gold mineralization. Slab Creek is situated near the 'Slab' mineral occurrence in the Bonnet Plume River district of the Wernecke Mountains. Meta-sedimentary rocks in the area consist of meta-siltstone, meta-silty dolomite and phyllite of the lower succession of the Early Proterozoic Wernecke Supergroup, known as the Fairchild Lake Group. These rocks were folded and metamorphosed to lower greenschist facies, and were subsequently intruded by the Wernecke Breccias during the Mid Proterozoic. Three alteration zones can be recognized within Slab Creek, an inner feldspar zone coinciding with the large breccia bodies, surrounded by a chlorite-quartz-carbonate zone, grading outward into a sericite-chlorite zone. Alteration, veining and mineralization is most intense within the albite alteration zone where iron oxide-copper-gold (cobalt-uranium) mineralization is disseminated and occurs as vein infill.

Organization: Government of Yukon | Gouvernement du Yukon
Geology and Gold Deposits at Ketza River, Yukon Territory

Gold mineralization at the Ketza River Mine occurs in massive manto replacement deposits along preferred horizons within Lower Cambrian limestone. Primary economic deposits occur on the south flank of the Ketza Uplift, postulated to be related to a Cretaceous buried intrusion. The Ketza Uplift appears to be associated with a major gold-bearing alteration system, with potential for large disseminated and stringer-stockwork type gold deposits in Lower Cambrian clastic rocks.

On the Ketza River property, the structural setting and mineralogy of the Shamrock zone is suggestive of the Carlin-type deposits of Nevada. This zone has undergone the same strong deformation as the manto deposits but further structural mapping is necessary to define the gold distribution. Future plans include re-mapping the property and re-interpretation of the structure.

Organization: Government of Yukon | Gouvernement du Yukon
Placer Mining Materials Handling Field Trials

This is an interim report by Wright Engineers Ltd., concerning the 1987 operation of the Airgold and Beron Placer tailings pumping systems.

The operating time achieved on both pumping systems has been too low to assess the effects of wear on the overall economics of the projects. At Beron, however, the pump failed due to a hole through the liner and casing after only 150 hours of operation. Wright's do not consider that the design/material selection has been optimized and steps have been taken to improve the life of the pump for 1988.

At Airgold, the pumping system was used for a total of 62.5 hours. The coupling connecting the pump to the diesel drive was replaced once and the replacement coupling has shown considerable wear. The failure of the coupling was probably due to misalignment which should be checked prior to reuse in 1988.

The test systems have proved that pumping of sluice tailings is practical, and may be economical, even when faced with the premature wear of the Beron pump.

Organization: Government of Yukon | Gouvernement du Yukon
Yukon Exploration and Geology 1996

Yukon Exploration and Geology 1996 consists of three parts: Part A is a comprehensive overview of mining and exploration activity in Yukon; Part B summarizes the activities of Government agencies which provide technical and financial assistance to the Yukon mining and exploration industries; and Part C consists of geological reports by Canada/Yukon Geoscience Office geologists and industry geologists.

Organization: Government of Yukon | Gouvernement du Yukon