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TitleGold mineralization within the Red Lake mine trend: example from the Cochenour-Willans mine area, Red Lake, Ontario, with new key information from the Red Lake mine and potential analogy with the Timmins camp
AuthorDubé, B; Williamson, K; Malo, M
SourceGeological Survey of Canada, Current Research (Online) no. 2003-C21, 2003, 15 pages, (Open Access)
PublisherNatural Resources Canada
Mediaon-line; digital; CD-ROM
RelatedThis publication is contained in the following publications
File formatpdf
AreaRed Lake; Cochenour; Willans
Lat/Long WENS-94.0000 -93.5000 51.2500 51.0000
Subjectseconomic geology; structural geology; gold; mineralization; ankerite; veins; breccias; deformation; folds; intrusive rocks; volcanic rocks; igneous rocks; alteration; hydrothermal alteration; Cochenour mine; Red Lake mine
Illustrationssketch maps; photographs; stereonets
Released2003 03 14
AbstractDetailed mapping of a large stripped outcrop revealed low-grade colloform-crustiform cockade ankerite veins and breccia and ankerite-quartz veins hosted by mafic-ultramafic Balmer assemblage volcanic rocks. Most ankerite veins and breccia are at high angle to and/or crenulated by S2, suggesting that they are pre- to early-D2 deformation. Gold mineralization is associated with arsenopyrite hosted by
brecciated, more or less silicified ankerite veins and breccia and a high-grade silicified zone. Numerous east-trending 'black line faults' cut all rock types. The Cochenour and Red Lake mines are on the limbs of a F1 fold refolded by F2 folds with associated east-southeast syn-D2 deformation zones. Local andalusite-rich and carbonate-vein clasts in the Huston conglomerate underground at the Red Lake mine indicate protracted or multistage alteration events with pre- and early-D2 carbonatization and aluminous alteration and some
late carbonatization. A regional unconformity (Huston conglomerate) represents a key empirical exploration target because 94% of the 27.6 M oz Au found in the district is in three deposits adjacent to the unconformity.