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TitleHeavy mineral and till geochemical signatures of the NICO Co-Au-Bi deposit, Great Bear magmatic zone, Northwest Territories, Canada
AuthorMcMartin, I; Corriveau, L; Beaudoin, G
Source24th International Applied Geochemistry Symposium (IAGS 2009), extended abstract volume; 2009, 4 pages
LinksCanadian Database of Geochemical Surveys, downloadable files
LinksBanque de données de levés géochimiques du Canada, fichiers téléchargeables
Alt SeriesEarth Sciences Sector, Contribution Series 20080673
Meeting24th International Applied Geochemistry Symposium (IAGS 2009); Fredericton; CA; June 1-4, 2009
ProvinceNorthwest Territories
NTS85N; 86C; 86D; 86E; 86F; 86K; 86L
AreaGreat Bear Lake; Lac la Martre; Hottah Lake
Lat/Long WENS-119.0000 -116.0000 67.0000 63.0000
Subjectsgeochemistry; surficial geology/geomorphology; glacial deposits; tills; till analyses; till geochemistry; till deposits; indicator elements; arsenopyrite; exploration; mineral exploration; copper; silver; gold; cobalt; bismuth; Great Bear magmatic zone; NICO deposit; Sue-Dianne deposit; indicator minerals
Illustrationslocation maps; photographs; plots
ProgramGEM: Geo-mapping for Energy and Minerals
AbstractTo establish a practical guide to geochemical and mineralogical exploration for IOCG deposits in glaciated terrain, an orientation study around the NICO cobalt-gold-bismuth deposit in the Great Bear magmatic zone of NWT was initiated in 2007. Bedrock and till samples collected over and down-ice from mineralization and host rocks, and in background terrain, were analyzed to characterize their heavy mineral and geochemical signatures. Heavy mineral analysis demonstrates that, apart from gold and magnetite, few mineral species present at NICO have some clear potential as indicator minerals in surficial sediments. The non-ferromagnetic heavy minerals are either not chemically stable in surface glacial sediments (arsenopyrite, chalcopyrite, pyrite), not sufficiently coarse-grained (bismuthinite, tourmaline), not abundant enough in the mineralized bedrock (scheelite, molybdenite, cobaltite), or not sufficiently heavy (ferroactinolite). Although the Co-rich composition of arsenopyrite is possibly the strongest vector to Au-rich polymetallic mineralization in the study area, arsenopyrite is completely oxidized in surface tills. Iron oxide composition using preliminary discriminant diagrams shows some potential, namely using the Ni/(Cr+Mn) vs Ti+V diagram. Till geochemistry reflects major differences in composition between the country/barren host rocks versus the mineralized rocks, and several elements (As-Bi-Co-Au-Cu-Sb-W-Cd) are identified as pathfinders for IOCG mineralization.