Abstract
Detailed 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.
Published Version
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