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TitlePreliminary report on the geology and controlling parameters of the Goldcorp Inc. High Grade zone, Red Lake mine, Ontario
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AuthorDubé, B; Williamson, K; Malo, M
SourceGeological Survey of Canada, Current Research (Online) no. 2001-C18, 2001, 31 pages, https://doi.org/10.4095/212108 (Open Access)
Image
Year2001
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediapaper; on-line; digital; CD-ROM
RelatedThis publication is contained in Geological Survey of Canada; (2001). Current Research 2001, winter release, Geological Survey of Canada, Current Research no. 2001
File formatpdf
ProvinceOntario
NTS52K/13; 52N/04
AreaRed Lake; Campbell
Lat/Long WENS-94.0000 -93.5000 51.2500 50.7500
Subjectsstructural geology; regional geology; economic geology; mineral deposits; carbonates; vein deposits; gold; quartz veins; mineralization; folding; shear zones; faults; alteration; deformation; strain; lineations; foliation; Archean; ore grades; magmatism; metamorphism; Campbell Red Lake Mine; Precambrian
Illustrationssketch maps; stereonets; photographs; schematic diagrams
ProgramWestern Superior NATMAP Project
Released2001 01 01
AbstractThe association of axial planar carbonate veins, high-grade ore zones, and an F 2 fold hinge deforming the basalt-ultramafic contact in the Goldcorp Inc. High Grade zone suggests a local geological control by an F 2 fold. The development of such an F 2 fold was potentially critical in forming the structures hosting the veins and in control- ling fluid circulation allowing formation of the carbonate extensional veins within the basalt and their subsequent Au-rich silicic replacement. The CO 2 -rich and auriferous silica-rich fluids were preferentially focused in a low-pressure F 2 hinge due to a combination of factors including competence contrast, tangential longitudinal strain associated with F 2 , and east-southeast-trending high-strain zones. The altered ultramafic rock acted as a less per- meable barrier controlling fluid migration along the folded contact, allowing supralithostatic fluid pressure to build up and inducing a ponding effect in the basalt underneath, to create wide, high-grade ore zones in low-pressure hinges. The Au-rich silicic replacement of the carbonate veins was potentially syn- to late-D 2 . Subsequent strain remobilized gold in late, extremely high-grade structures.
GEOSCAN ID212108