First-order D2 faults occur as laterally extensive east-northeast-trending structures that may be associated with discrete, narrow (less than 0.2 metre wide) mineralised veins. Understanding the variation in orientation and geometry of D2 faults is critical for exploration targeting within the Keno Hill district. Silver-lead-zinc mineralisation in the district is controlled by the complex interplay of fault geometry and orientation, secondary thickening of host rocks as a result of early folding and thrusting (D1), and variations in the mechanical properties of the various lithological units. Three discrete episodes of deformation have been defined in the Keno Hill area: pre-mineralisation fold and thrust belt development (D1) syn-mineralisation sinistral strike-slip to sinistral-normal oblique-slip brittle fault development (D2) and post-mineralisation, Cordillera-parallel, dextral-normal oblique-slip fault development (D3). Silver-lead-zinc mineralisation is preferentially hosted in thick, competent quartzite units within the Mississippian Keno Hill Quartzite, and to a lesser extent, in deformed Triassic greenstone units where they occur within broad packages of relatively ductile schist. The Keno-Lightning project is located in the underexplored eastern portion of the historic Keno Hill silver-lead-zinc mining district, within the Selwyn Basin, Yukon. It included an initial structural interpretation of airborne geophysical data with the aim of developing a litho-tectonic framework for the region, and was followed up by a short program of mapping to ground truth -interpreted structures. This work aimed to define targets for exploration drilling.

commissioned SRK to conduct a desktop and field structural geology analysis of the Keno-Lightning project. In November 2016, Metallic Minerals Corp.

Simon Craggs, Senior Structural Geology Consultant

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