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TitleGeology of the Goldcorp Inc. High Grade zone, Red Lake mine, Ontario: an update
AuthorDubé, B; Williamson, K; Malo, M
SourceGeological Survey of Canada, Current Research (Online) no. 2002-C26, 2002, 13 pages, (Open Access)
PublisherNatural Resources Canada
Mediapaper; on-line; digital
RelatedThis publication is contained in Geological Survey of Canada; (2002). Current Research 2002, winter release, Geological Survey of Canada, Current Research no. 2002
File formatpdf (Adobe Acrobat Reader)
AreaRed Lake; Balmertown
Lat/Long WENS-94.0000 -93.5000 51.2500 51.0000
Subjectsstratigraphy; structural geology; economic geology; gold; mineralization; mineral potential; bedrock geology; structural features; deformation; folding; strain; faulting; vein deposits; ore grades; mineral deposits; ore mineral genesis; alteration; replacement deposits; remobilization; Campbell Fault Zone
Illustrationssketch maps; photographs
Released2002 02 15
AbstractGold mineralization in the Goldcorp Inc. High Grade zone is synchronous with D 2 , a protracted event characterized by continuous northeast-southwest-directed shortening. The geometry of the carbonate vein network is related to an early D 2a strain increment. D 2a has induced folding of the layered sequence and synchronous emplacement of axial-planar fissure veins, bedding-parallel and discordant conjugate veins, and some oblique-lateral displacement that was possibly involved in formation of the carbonate vein network. The main stage of high-grade auriferous silica replacement was contemporaneous with D 2 boudinage of the carbonate veins. The auriferous silica-rich fluid was focused in specific F 2a hinge zones because of competence contrast, tangential longitudinal strain, a low-permeability stratigraphic cap, and local higher strain zones. This was followed by a second strain increment (D 2b ) characterized by attenuation and transposition of the F 2a fold limbs, deformation of the vein network, and ultimately reverse-sinistral faulting. Gold was locally remobilized in extremely rich fractures postdating the lamprophyre dykes.