Report (English, PDF)

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Publisher-reported update

2026-08-26

Two phases of ductile deformation, followed by thrusting and extension, affected the Ketza River Mine area. D1 produced large scale E-W trending folds (F1) with upright axial planes, and a pronounced axial planar foliation (S1). Large scale F2 folds have E-W axial trends coincident with those of F1, and moderately NNE-dipping axial planes and axial planar foliation (S2). D2 also produced small-scale, SSW-verging folding of S1 along E-W to NW trending axes. Shallowly SSW-dipping thrust fault surfaces, and regional analogies suggest NE-directed thrusting (D3). An extensional event (D4) coincided with the timing of mineralization. Normal displacement along the S-dipping Peel Fault resulted in the separation of the map area into two stratigraphic domains:: predominantly unit 1a argillites exposed in the northern domain, and predominantly unit 1d limestones exposed on the southern domain. Subsequent to the development of the Peel Fault, a series of NNW trending listric and planar normal faults separated the map area into four structural domains:: 1) western half-graben; 2) central horst; 3) eastern graben; and 4) eastern planar high-angle fault blocks. Axial-planar extensional veins…

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