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TitleThe Archean Côté Gold intrusion-related Au(-Cu) deposit, Ontario: a large-tonnage, low-grade deposit centred on a magmatic-hydrothermal breccia
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AuthorKatz, L R; Kontak, D J; Dubé, B; McNicoll, V J
SourceTargeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration; by Dubé, B (ed.); Mercier-Langevin, P (ed.); Geological Survey of Canada, Open File 7852, 2015 p. 139-155, https://doi.org/10.4095/296635 (Open Access)
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
RelatedThis publication is contained in Dubé, B; Mercier-Langevin, P; (2015). Targeted Geoscience Initiative 4: Contributions to the understanding of Precambrian lode gold deposits and implications for exploration, Geological Survey of Canada, Open File 7852
File formatpdf
ProvinceOntario
NTS41P/16
AreaKirkland Lake; Côté Lake
Lat/Long WENS -80.5000 -80.0000 48.0000 47.7500
Subjectseconomic geology; Archean; gold; mineralization; hydrothermal alteration; hydrothermal deposits; magmatism; Upper Beaver gold system; Côté Lake gold system; Swayze greenstone belt; Côté Gold deposit; Precambrian
Illustrationslocation maps; photographs; plots
ProgramGold Ore Systems, Targeted Geoscience Initiative (TGI-4)
Released2015 06 11
AbstractThe recently discovered Côté Gold deposit, located in the southeast limb of the Swayze greenstone belt, Abitibi Subprovince, is an Archean low-grade, high-tonnage Au(-Cu) deposit. The deposit is hosted by the 2741 Ma Chester intrusive complex (CIC), a high-level, multi-phase, laccolithic-shaped synvolcanic intrusion composed of several tonalite and diorite phases. Although a close temporal and spatial relationship exists between the phases of the CIC, whole-rock geochemistry on least-altered samples suggests they are petrogenetically unrelated. Notably, the tonalite phases are characterized chemically as low-Al type, which is atypical of the tonalite-trondhjemite-granodiorite suites in the Archean Superior Province and elsewhere, but typical of primitive arc submarine environments. The mineralized system at the Côté Gold deposit is cospatial with a multi-phase, magmatic-hydrothermal breccia body that contains multiple brecciation events and matrices and is overprinted by several alteration types (biotite, sericite, silica-sodic). Whole-rock geochemistry indicates that the deposit is Au(-Cu) only and is relatively depleted in other elements (e.g. As, F, Bi, Te). The overlap of Re-Os dates on syn-gold-deposition molybdenite (2739 ± 9 Ma) with the 2741 Ma CIC is consistent with field observations that suggest an overlap of magmatic and hydrothermal events. The results of this study have defined a new significant early stage gold metallogenic event in the Abitibi Subprovince at 2740 Ma and the deposit provides a guide for future exploration in other composite, subvolcanic, low-Al intrusions in the Archean.
GEOSCAN ID296635