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TitleIndicator-mineral signatures of the Casino porphyry Cu-Au-Mo deposit, Yukon
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorMcClenaghan, M BORCID logo; McCurdy, M WORCID logo; Beckett-Brown, C EORCID logo; Casselman, S C
SourceGeological Survey of Canada, Open File 8711, 2020, 42 pages (11 sheets), Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
MapsPublication contains 11 maps
Map Info.surficial geology, mineral concentrations and occurrences, 1:200,000
Mediaon-line; digital
File formatreadme
File formatpdf; rtf; docx (Microsoft® Word®); xlsx (Microsoft® Excel®); xlsm (Microsoft® Excel®); png; ai
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; mineralogy; surficial geology/geomorphology; Science and Technology; Nature and Environment; unglaciated areas; mineral deposits; porphyry deposits; copper; gold; molybdenum; polymetallic ores; vein deposits; placer deposits; sediments; mineral exploration; exploration methods; heavy mineral samples; stream sediment samples; mineral occurrences; sulphides; chalcopyrite; pyrite; molybdenite; arsenopyrite; bismuthinite; sphalerite; tourmaline; scheelite; barite; epidote; bedrock geology; lithology; 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; tables; location maps; schematic cross-sections; flow diagrams; photomicrographs
ProgramTargeted Geoscience Initiative (TGI-5) Intrusion/Porphyry ore systems
Released2020 04 01
AbstractThis open file reports the results of an indicator mineral case study carried out around the Casino porphyry Cu-Mo-Au deposit in the unglaciated terrain of the west central Yukon. The research was part of the Geological Survey of Canada's (GSC) Targeted Geoscience Initiative 5 (TGI-5) Program. The purpose of the study was to test the use of indicator minerals as a porphyry Cu exploration tool in unglaciated terrain. At 22 sites around the deposit, a bulk stream sediment sample was collected to document the indicator mineral signature of the deposit. Steam water and stream silt samples were also collected at the same sites to compare geochemical to heavy mineral signatures. This open file presents indicator mineral abundance data for the bulk stream sediment samples.
The Casino deposit has an obvious indicator mineral signature in the <2 mm heavy (>3.2 specific gravity (SG)) and mid-density (2.8-3.2 SG) fractions of stream sediments that consists of, in order of usefulness: gold>chalcopyrite>molybdenite>sphalerite>jarosite>goethite>pyrite that is detectable at least 14 km downstream. Similar indicator mineral patterns in other creeks indicate the presence of additional porphyry style mineralization nearby. Detailed characterization of the mineral chemistry of tourmaline and scheelite that is in progress will determine their suitability for porphyry Cu exploration in this unglaciated terrain. Government and exploration surveys will benefit from the addition of indicator mineral sampling to routine stream sediment sampling protocols.
Summary(Plain Language Summary, not published)
The open file reports results in the development of indicator mineral methods for porphyry Cu exploration in Canada.

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