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TitleMineral and geochemical signatures of porphyry copper mineralization: work in progress for the Casino Cu-Au-Mo-Ag porphyry deposit, Yukon
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AuthorMcClenaghan, M B; McCurdy, M W; Garrett, R G; Beckett-Brown, C E; Leybourne, M I; Casselman, S G; Pelchat, P
SourceTargeted Geoscience Initiative: 2018 report of activities; by Rogers, N (ed.); Geological Survey of Canada, Open File 8549, 2019 p. 333-344, (Open Access)
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Rogers, N; (2019). Targeted Geoscience Initiative: 2018 report of activities, Geological Survey of Canada, Open File 8549
File formatpdf
NTS115J/09; 115J/10; 115J/11; 115J/14; 115J/15; 115J/16
AreaCasino Creek
Lat/Long WENS-139.1667 -138.1667 63.0000 62.5000
Subjectseconomic geology; mineralogy; geochemistry; surficial geology/geomorphology; mineral deposits; porphyry deposits; copper; mineral exploration; ore mineral genesis; mineralization; ore controls; exploration methods; mineral occurrences; gold; molybdenum; silver; zinc; stream sediment geochemistry; bulk samples; silts; stream water geochemistry; heavy mineral analyses; isotopic studies; hydrogen isotopes; oxygen isotopes; Casino Deposit; Yukon-tanana Terrane; Intermontane Belt; Canadian Cordillera; ore systems approach; porphyry copper indicator minerals (PCIM); geochemical signatures; alluvial sediments; pebbles; Phanerozoic; Cenozoic; Quaternary; Tertiary; Mesozoic; Cretaceous; Paleozoic; Permian; Carboniferous; Mississippian; Devonian; Precambrian; Proterozoic
Illustrationsgeoscientific sketch maps; photomicrographs; geochemical plots
ProgramTargeted Geoscience Initiative (TGI-5), Knowledge Management Coordination
ProgramTargeted Geoscience Initiative (TGI-5), Intrusion/Porphyry ore systems - porphyry processes - mineral markers
Released2019 03 01
AbstractThis paper reports preliminary results for a detailed indicator mineral and geochemical study of the Casino porphyry Cu-Au-Mo-Ag deposit, one of the largest and highest grade porphyry deposits in Canada. The calc-alkaline porphyry is hosted in a Late Cretaceous quartz monzonite and associated breccias in the west central Yukon. This deposit is an ideal study site because it has not yet been disturbed by mining, contains tourmaline, and metal-rich stream sediments were previously identified around the deposit. At 22 sites around the deposit, one bulk stream sediment sample for recovery of indicator minerals, two water samples and one stream silt sample for geochemical analysis, and one pebble sample were collected. Preliminary results indicate that chalcopyrite, pyrite, gold, molybdenite, sphalerite, scheelite and tourmaline in the heavy mineral fraction of stream sediments are indicators of the porphyry mineralization and demonstrate that indicator mineral methods are a viable exploration tool in this unglaciated terrain. The geochemical signature of the deposit is best defined by Ag, As, Au, Bi, Cd, Cu, Fe, Mn, Mo, Pb, U and Zn in stream silt (<0.177 mm), a well-established exploration method in the region, and by Cd, Co, Cu, Mo, Pb and Zn in stream water, a new tool for mineral exploration.