The Lik deposits are examples of a large group of deposits broadly referred to as sedimenthosted zinc-lead-silver deposits.

The Lik deposit is hosted in the upper part of the Ikalukrok Unit of the Kuna Formation. At Lik, the immediate host rocks are carbonaceous and siliceous black shale, with subordinate black chert and fine-grained limestone. These rocks strike broadly north-south and dip at approximately 25° to 40° to the west . The massive sulfides are overlain conformably by rocks of the Siksikpuk Formation. The sequence is overridden by allochthonous rocks that form high hills north and west of the deposits.

The mineralized sequence is cut by a number of minor faults. Recent drilling has demonstrated that several of the interpreted faults may not exist, or the movement on the fault is minor. The most significant of these faults is the Main Break Fault. While the plunge of the northern end of the Lik deposit increases to approximately 25° to 42°, it is no longer apparent that there is a break separating the Lik South and Lik North deposits. It is also unclear whether there is a change in strike north of the fault, or whether the change is more apparent due to topography.

Recent work appears to show that the fault does not exist, or its effects are very minor. The division into two parts is maintained and the boundary is taken as Section 13800N for this report. As presently tested, the largest lens, the A Lens of the Lik South deposit, is approximately 1,100 m long and 600 m wide and much of it is flat-lying. It contains the bulk of the tonnage in the Lik South area. The second largest lens, B Lens, is approximately 500 m long, up to 200 m wide, and averages approximately 120 m wide. The R Lens is approximately 400 m north-south, 100 m east-west, and up to 5 m thick and lies about 6 m above the A Lens. Mineralization in the Lik South deposits has been tested down dip to a depth of approximately 150 m to 200 m.

The Lik North deposit is approximately 700 m long and 350 m wide. As with the Lik South deposit, mineralization is interpreted as occurring in a number of lenses, with most of the mineralization present in a single lens referred to as the North Lens in this report. The North Lens plunges at about 25° to 42° and has been tested down dip to a depth of about 300 m.

The deposits strike broadly northerly and dip westerly at approximately 25° to 40°. The mineralization comprises irregular, stratiform lenses. The mineralogy of the sulfides is simple and comprises pyrite, marcasite, sphalerite, and galena, with rare tetrahedrite, bournonite, and boulangerite. Gangue minerals include quartz (as chert), clay minerals, carbonate, and barite. Noranda recognized six different ore types in its logging of drill core (Scherkenbach et al., 1985). Sulfide grain sizes and grades vary between different ore types. Maximum sphalerite grain size is about 100 µm.

The deposit will be a conventional, open pit, truck-and-shovel operation. A mill feed of approximately 5,500 t/d is planned over a nine-year mine life. There will be a small quantity of pre-strip material in Year -1, with a full production ramp-up in year 1. The throughput rate in Year 1 was reduced to 80% of full capacity to reflect mill construction and start-up time.

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The overflow from both hydrocyclones in grinding circuit will feed to carbon pre-flotation circuit to remove the organic carbon from the ore prior to lead rougher flotation. Carbon pre-flotation circuit includes rougher and cleaner stages. Carbon pre-flotation cleaner concentrate containing most of the organic carbon will be discharged to the tailings thickener and the carbon pre-flotation rougher and cleaner tails, which contains the valuable minerals, will feed to the lead (Pb) rougher flotation circuit.

The carbon pre-flotation rougher and cleaner tails, which conclude the feed to the lead rougher flotation, will be conditioned in the lead rougher flotation conditioning tank. The flotation reagents will include lime, zinc sulfate, promoter 3418A and methyl isobutyl carbinol (MIBC). The lead rougher flotation circuit consists of eight flotation tank cells (six rougher and two rougher scavenger). The concentrate from the rougher and rougher scavengers are combined and sent ........