The Premier property is mainly underlain by Jurassic-aged Hazelton Group rocks composed of a thick package of homogeneous andesitic tuffs, lapilli tuffs, and flows interpreted to have formed in an Island Arc setting. Dykes and sills of Premier porphyry (a quartz-K-spar-hornblende porphyry of intermediate composition) are the most abundant intrusive rocks in the area, and are spatially associated with some mineralized zones, particularly at Premier.

Gold–silver mineralization is hosted within structural zones expressed by quartz breccias, quartz veins and stockwork often within large areas of quartz-sericite-pyrite alteration. Elevated gold and silver values are closely associated with silicification and sericitic alteration. Gold occurs predominantly as electrum, with native gold present locally. Silver occurs in its native form, and in electrum, argentite, and freibergite.

The most common sulfides are pyrite, sphalerite with minor galena, and chalcopyrite. The mineral assemblage suggests that the style of mineralization at Premier falls into the intermediate sulfidation epithermal category as neither high sulfidation minerals (such as covellite or enargite) nor low-sulfidation minerals (such as arsenopyrite and pyrrhotite) have been observed.

Mineral deposits in the PGP are intermediate-sulfidation epithermal gold-silver deposits with subsidiary base metals. These deposits form at comparatively shallow depths (generally above 1 km depth), often in association with hot-spring activity on surface. Mineralization results from circulation of aqueous solutions driven by remnant heat from intrusive bodies. Where these ascending fluids encounter meteoric waters, and/or as the hydrostatic pressure drops, changes in temperature and chemistry results in precipitation of minerals into fractures, breccias, and open spaces.

Mineralized bodies are structurally controlled veins, stockworks, and breccia bodies, and are broadly tabular with a wide range of orientations. They measure from centimetre scale to many metres in thickness and can often be traced for strike lengths of several hundred metres or even kilometres. Economic minerals comprise native gold and native silver, electrum, silver sulfosalts, and silver sulfides, along with pyrite, sphalerite, and comparatively minor amounts of chalcopyrite and galena. Gold and silver values are quite variable, and average on the order of 5 g/t to 10 g/t Au and 20 g/t to 30 g/t Ag within the historical stopes.

The geology of the Red Mountain area is characterized by Upper Triassic to Lower Jurassic metasedimentary and tuffitic units that have been intruded by a multi-phase intermediate intrusive complex. The intrusive rocks show porphyry style alteration with K-spar alteration and tourmaline as well as lower temperature quartz-sericite-pyrite alteration. Gold mineralization is hosted in a series of pyrite rich breccia bodies and stockwork zones associated with the brecciated contact zone at the edge of the intrusive body. The alteration associated with the high grade-gold mineralization is characterized by sericite and silicification.

Eocene intrusions of the Coast Plutonic Complex occur to the west and south of Red Mountain and are associated with high-grade silver-lead-zinc occurrences; gold-silver-bismuth ± copper-lead-zinc mineralization recently identified in the Lost Valley area is likely of Eocene age. Recent interpretation is that the gold mineralization at Red Mountain is consistent with an intrusive-related hydrothermal system, rather than a porphyry-gold deposit according to previous interpretation.

Mining methods described herein will be applied at both PGP and RMP. In the case of RMP, the orebody is continuous and sufficiently wide to use a transverse longhole stoping method; whereas at PGP, the ore is along more discrete lenses and tend be narrow, requiring a narrow longitudinal retreat approach to longhole mining. These can be single or multiple sub-levels mined in a block.

The project employed mining methods appropriate to the local conditions at each site, where variations in geotechnical character, grade, ore thickness and ore geometry and inclination were all considered in stope optimization. The target was to develop a coordinated plan to supply 2,500 t/d to the Premier mill, optimizing the production of gold ounces at the lowest operational cost.

The Study’s mine plan generally utilizes a combination of three mining methods: longhole (64%), inclined undercut longhole (14%), and room and pillar (12%), with minor amounts of cut and fill (2%) and development ore (8%) to extract the mineral reserves. A particular mining method was chosen based on an economic assessment of each method for a given geometry and geotechnical characteristics depending on its location in the deposit. The stope shapes and mine access development were individually modelled and evaluated to form the final mineable reserve.

Mining dilution occurs at various rates depending on the mining method and ground conditions based on rock quality in geotechnical domains in the block model. Dilution comes in from a number of sources: planned dilution is material taken within the bounds of a stope layout while unplanned material comes from material outside the stope shape such as the hanging wall and footwall, or minor amounts from backfill.

Dilution generally ranges from 10% to 40%. In some cases where two wireframes are very close together, the waste parting between the wireframes was taken providing it was economically justified. Table 1-4 summarizes the annual production from all areas.

A conventional and common mobile mining fleet is shared between the two sites, to reduce spares and capital expense. Development headings and stope accesses used a common approach with key equipment used during preproduction and operations consisting of 2B jumbos, 10-tonne LHDs, 30-tonne mine haul trucks, bolters, shotcreters and production longhole drills.

Mine services such as dewatering, ventilation and electrical reticulation employed a common approach at each site in a similar manner to mobile equipment to standardize pumps, fans and MCC’s reducing the required spares and capital expenditure. Underground water handling at both sites employs a conventional series of sumps and pumps to move the water out to settling ponds on surface. At PGP water from Silver Coin and Big Missouri have a common pond, which is then directed by pipeline to the water treatment plant at the historical 6 level at Premier mine.

The ventilation systems were designed to meet BC regulations based on the requirements of engines sizes and utilization. Fresh air is heated by a propane system when required during winter months. Workforce will consist of technical staff and operations personnel, consisting of miners, mechanics, electricians, and supervision. At peak production the mine department will have 110 people, with about 40 people active at the site at a given time. In some instances, shared technical resources will be based in Stewart supporting both sites.

Personnel will live in the town of Stewart which is an easy drive from both PGP and RMP. Buses will bring staff and operating people to site, in order to limit the number of personal vehicles on the surrounding roads. Some staff and supervision required to move among sites will drive company supplied pickup trucks.

The existing Premier mill facilities, mine, and surface infrastructure have been kept on a care and maintenance regime since 2001. During 2019, an engineering assessment was conducted with a detailed field review of the facilities by a local constructor. The review focussed on the condition of the plant and equipment with the aim of establishing a basis for costing a re-commissioning of the operation. This forms the basis for the Feasibility Study design and execution activities described in this NI 43-101.

The Premier mill facility plans for re-starting will feature a combination of upgrades and returning the existing facilities to an operating condition. The development work assessed the current condition of the equipment and structures, allowing the engineering team to develop a capital cost for the restart of the facilities using a combination of the existing, refurbished existing, and new equipment for each of the following areas.

•Crushing and stockpiling