The deposits in the Wharf Operations area are considered to be examples of structurally controlled and disseminated gold mineralization. The Wharf deposit has been described as a hydrothermal replacement deposit, (Lessard and Loomis, 1990) a Carlin-type deposit (Paterson, 1990), and more recently as a low- to intermediate-sulfidation epithermal deposit. (Pedraza Rojas, 2017). Host rocks to epithermal deposits are dominantly silty carbonates, but mineralization can also be present in siliceous and silicified rocks as well as intrusive rocks. Low- to intermediate-sulfidation epithermal deposits commonly exhibit significant structural (faults) and stratigraphic (composition/permeability) controls. Mineralization often consists of extremely fine-grained disseminated gold, hosted primarily by arsenian pyrite. Wharf differs from this standard model in that host rocks are dominantly sandstone with varying carbonate content and trachytic porphyry, and mineralization consists of native gold and electrum and remobilized gold in addition to early-stage gold-bearing sulfides. Deposit Dimensions The Wharf deposit dimensions range from 8,000–9,000 ft long in the east–northeast direction, 2,100–5,000 ft wide, 150 ft thick in historically mined areas to 500 ft in active pits. Mineralization has been drill tested to varying depths to the Precambrian surface, which ranges from 5,400–6,200 ft in elevation across the deposit. Lithologies Trachytic sills are the bulk of the mineralized litho ........

The Wharf Operations use conventional truck and loader mining methods to feed a heap leach pad. The mine has been in continuous operation since 1983.

The Wharf Operations are currently a conventional truck and loader heap leach gold mine. The operation consists of five heap leach pads, which are all load/offload pads. The majority of the planned mining disturbance falls within the current permitted area and an expansion to the mine permit is expected in 2022 that will cover the remaining mineral reserve estimate.

Coeur leases nearly all the earth-moving equipment used at the mine. Relationships with local dealers span over 15 years, and the earthmoving equipment is under contract through 2024.

In-situ ore and waste must be blasted prior to removal. Several historic pits that were partially backfilled are being mined again and the backfilled material is considered re-handle and does not require blasting. Waste material removed for access to the ore is taken to one of the WRSF sites. The WRSF sites are all designed to fill existing pits and are reclaimed as soon as possible after placement.

Mined ore is either placed in a stockpile or placed directly into the primary crusher ore hopper. Crushed ore is then conveyed to a final product stockpile. Crushed ore is picked up by loaders and placed in trucks to be dumped in 20 ft lifts on one of the five heap leach pads.

Coeur uses Epiroc DM-45 hammer drills to drill patterns. Pa ........

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