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Publisher-reported update

2026-08-26

The shale-hosted massive sulphide Zn-Pb deposits of Howard’s Pass were deposited during the Silurian and subsequently deformed during the Cretaceous Cordilleran orogeny. A recent model proposes that the deposits are hosted within a regional thrust duplex with strong transposition of bedding. This study aims to test this model and is focused on the XY group of deposits. Lithostratigraphic mapping and structural observations indicate one main phase of folding, F1, and the XY group of deposits is located on the southern limb of a macroscopic F1 syncline. F1 folds are steeply inclined and gently plunging to the WNW–NW. A regionally developed, steep, NE dipping, cleavage, S1, is axial planar to the F1 folds across Howard’s Pass. S1 manifests as a slaty cleavage comprising pervasively developed dissolution seams. WNW and NNE striking extensional faults overprint F1 folds. No shear fabrics or evidence for transposition of bedding were identified.

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