The KSM deposits display many diagnostic features of porphyry Cu ± Au ± Mo systems. The deposits are centered on intrusive complexes composed of Early Jurassic, Texas Creek suite porphyry stocks and dykes. The Kerr, Mitchell, East Mitchell, and Iron Cap zones display the typical lateral and vertical zoning sequence of alteration assemblages observed in many porphyry systems: deep central potassic alteration, peripheral propylitic alteration, and shallow sericitic alteration. Mineralization is associated with stockwork quartz veinlets and arrays of sheeted quartz veinlets, with vein density decreasing in later intrusive phases. Host rocks may be mineralized for up to several hundred meters from the intrusions. The Kerr, Mitchell, and East Mitchell zones also feature small remnants of advanced argillic alteration. The structurally complex Sulphurets deposit does not feature the same clear alteration zoning patterns observed at the other three deposits, due to its dismembered and fragmental nature. However, the Lower Panel fault block at Sulphurets, which hosts the bulk of the mineralization, features potassic alteration and mineralization typical of porphyry Cu ± Au ± Mo systems.

KerrR Zone
The Kerr Zone is centered on an Early Jurassic, north-south trending, steep westerly dipping, tabular intrusive complex. Drilling demonstrates that the Kerr Zone has an extent of 2,400 m along strike, a width of roughly 800 m, and a vertical extent of at least 2,200 m. The f ........

A PFS-level production schedule, based on an annualized average 195,000 t/d mill feed rate, has been developed for the PFS based on open pit designs at Mitchell, East Mitchell, and Sulphurets deposits areas. The resulting mine life is approximately 33 years.

Mitchell Pit Design
The proposed Mitchell pit will be located within a glacially modified valley and targets a mineral deposit located in the valley floor, resulting in 1,200 m high ultimate slopes.

Recommended inter-ramp slope angles vary from 36° to 53° based on wall orientation, overall wall height, geotechnical domain, and controls on slope stability. Inter-ramp slope heights are limited to 150 m, after which a geotechnical berm (or ramp) with a minimum width of 25 m is required. The inter ramp height limits and geotechnical berms provide flexibility in the mine plan to mitigate potential slope instability; access for slope monitoring installations; and working space for in-pit wells, drains, and other water management infrastructure. All final pit slopes are assumed to be excavated using controlled blasting. Depressurization of the proposed pit slopes requires a combination of vertical wells, horizontal drains, and a dewatering adit with drainage galleries.

Sulphurets Pit Design
The proposed Sulphurets pit will be located on a glacially modified ridge between the Mitchell and Sulphurets valleys. The proposed mine plan would result in ultimate pit slopes with maximum heights ........

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The proposed KSM plant for the 2022 PFS will start with nominal process rate of 130,000 tpd and expand to 195,000 t/d by Year 3 of operations. The process plant will receive ore from Mitchell, Sulphurets, and East Mitchell deposits. The planned mill life is approximately 33 years, excluding the production development stage and closure stage.

A combination of conventional flotation and cyanidation processes are proposed for the PFS. In general, the mineralization from Mitchell, Sulphurets, and East Mitchell deposits are amenable to the combined flotation and cyanidation process. The process plant will consist of three separate facilities:
• an ore primary crushing and handling facility at the mine site;
• an ore transportation system by trains through the MTT;
• a main process facility in the Treaty OPC area at the plant site, including following process facilities:
- coarse ore stockpiles;
- secondary crushing by cone crushers in closed circu ........