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TitleThe stream-sediment geochemical signature of the Casino porphyry Cu-Au-Mo deposit, Yukon: a case study
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMcCurdy, M WORCID logo; McClenaghan, M BORCID logo; Garrett, R G; Pelchat, P
SourceGeological Survey of Canada, Open File 8632, 2019, 39 pages (41 sheets), Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
MapsPublication contains 41 maps
Map Info.geochemical, stream sediment geochemistry, 1:200,000
Mediaon-line; digital
RelatedThis publication is related to Stream sediment geochemical data for the Casino porphyry Cu-Au-Mo deposit, Yukon: additional data in 2021
File formatreadme
File formatpdf; rtf; docx (Microsoft® Word®); xlsx (Microsoft® Excel®); jpg
NTS115J/09; 115J/10; 115J/11; 115J/14; 115J/15; 115J/16
AreaYukon River
Lat/Long WENS-139.1667 -138.1667 63.0000 62.5000
Subjectseconomic geology; geochemistry; surficial geology/geomorphology; Science and Technology; Nature and Environment; mineral deposits; porphyry deposits; copper; gold; molybdenum; polymetallic ores; vein deposits; placer deposits; mineral exploration; exploration methods; stream sediment geochemistry; bulk samples; silts; stream water geochemistry; mineral occurrences; silver; lead; zinc; bedrock geology; lithology; neutron activation analyses; mass spectrometer analysis; x-ray fluorescence analyses; arsenic geochemistry; bismuth geochemistry; manganese geochemistry; antimony geochemistry; statistical analyses; Casino Deposit; Yukon-Tanana Terrane; Intermontane Belt; Canadian Cordillera; Casino Suite; Prospector Mountain Suite; Carmacks Group; Snowcap Assemblage; Finlayson Assemblage; Stevenson Ridge Schist; Simpson Range Suite; Mt. Baker Suite; White River Assemblage; Sulphur Creek Suite; Klondike Schist; Sulphur Creek Suite; Whitehorse Suite; Coffee Creek Granite; Rhyolite Creek Complex; alluvial sediments; Phanerozoic; Cenozoic; Quaternary; Tertiary; Mesozoic; Cretaceous; Jurassic; Triassic; Paleozoic; Permian; Carboniferous; Mississippian; Devonian; Silurian; Ordovician; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; location maps; tables; photographs; geochemical plots; plots
ProgramTargeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems
Released2019 12 19
AbstractThe Casino calc-alkaline porphyry copper-gold-molybdenum deposit, located within the Yukon-Tanana terrane in west-central Yukon, is hosted in Late Cretaceous quartz monzonite of the Casino suite. It is unique among Canadian porphyry Cu deposits in that it has a substantially preserved outcropping leached cap. Samples of stream sediment and water were collected at 22 sites over a period of eight days in September 2017 around the deposit in order to determine if the metal zoning of elements associated with the porphyry copper system is reflected in the geochemical composition of the <177 micrometres stream sediment fraction. Ten elements are considered in this report: Au, Cu, Mo, Ag, Sb, As, Zn, Pb, Bi and Mn. These elements were selected based on previous studies and correlation analysis using symmetric coordinates. Statistical comparisons (Reduced Major Axis regression and Kolmogorov-Smirnov tests) of the Casino samples confirmed that these data are comparable with an older regional data set of 19,471 samples and a subset of 1,301 samples from areas around the deposit and within the Yukon-Tanana terrane that were collected by the Geological Survey of Canada in 1986. Data for element concentrations determined on dry unsieved stream sediments collected in 2017 using a portable X-ray fluorescence device are also included in this report.
Summary(Plain Language Summary, not published)
The Casino copper-gold-molybdenum deposit is located in west-central Yukon. The Casino deposit is unique in that unlike most of the rest of Canada, the land around it has not been affected by recent continental glaciers. Samples of stream sediment and water were collected at 22 sites in September 2017 from streams near the deposit in order to determine the amount of metal elements present in the sediment and water. Ten elements are studied in further detail in this report; gold, copper, molybdenum, silver, antimony, arsenic, zinc, lead, bismuth, and manganese. Using statistics, we determined that Casino samples were similar to stream sediment samples from the same area collected in 1986 and reanalyzed in 2014. The Casino samples were also analyzed with a portable X-ray fluorescence device and the results compared with other types of analysis.

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