This paper presents the results of a geometric and structural study aimed at developing a predictive model to account for the distribution of gold-bearing veins at the Sigma gold deposit, Abitibi subprovince, Canada. Results indicate that third-order shear zones define a well-organized system comprising two sets of parallel-striking, moderately to steeply south-dipping curviplanar structures intersecting at constant 15° to 25° angles. Fault-fill veins are better developed within the curved segments of the shear zones that represent large zones of enhanced permeability. Most extensional veins were formed later as tension gashes, mainly distributed along conjugate corridors of low reverse faults, typical of Andersonian-type faulting.

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