Mineralization in the Gold Bar District has most of the characteristics of Carlin-type gold deposits described in Muntean and Cline (2018), including: carbonate host rocks, tectonic setting, structural and stratigraphic ore controls, hydrothermal alteration consisting of dissolution and silicification of carbonate and argillization of silicates, auriferous arsenian pyrite, a geochemical signature containing Au-As-Hg-Sb-Tl, low Ag (Ag/Au<1), and lack of clear relationship with intrusions. Gold mineralization in the Gold Bar district is localized at the intersections of a complex array of structures with permeable and reactive strata. Carbonate dissolution, argillization of silicates, sulfidation of ferroan minerals and silicification of limestone characterize the alteration assemblage related to the main stage of mineralization. Gold is found as sub-micron inclusions or solid solution in arsenian pyrite. Oxidation has liberated gold from the original pyrite, making it amenable to cyanide leaching. Common trace elements include arsenic, antimony, thallium,and mercury.

Central Nevada is underlain by Paleozoic sedimentary and volcanic rocks which were in turn covered by Tertiary volcanic rocks and sediments. During the early Paleozoic, this part of Nevada was the western pre- continental margin of the North American plate. From Silurian through Devonian time, extensive carbonate platforms developed along the continental margin, generating a thick wedge of carbonate sed ........

The Gold Bar Project is planned for production using conventional hard rock open pit mining methods. Ore production to the crusher is planned at a maximum capacity of 7,500 tpd (2,750 ktons/yr). Additional run of mine (ROM) material will be placed when available. The maximum ore production to the leach pad (crushed & ROM) is planned to be 8,880 tpd (3,240 ktons/yr). The mine production schedule was developed with the goal of filling the crusher at the required ore rate and maximizing the project return on investment. The total material rate is tied to equipment productivity and fluctuates by period. The maximum total production is expected to reach a rate of 43,000 tons/day (16,100 ktons/yr). The mine is scheduled to operate 6 days/wk with two, 10-hour shifts/day.

The Gold Bar Project is currently being mined by a contractor, and this is planned to continue. Contractor equipment on hand is often variable. There is flexibility in the fleet size, and the actual mining fleet in use will likely vary depending on the contractor’s fleet on hand.The schedule and production requirements were based on the following fleet assumptions: Bench heights are planned at 20-ft; drilling is planned based on using four rotary down-the-hole hammer drills with 45,000 lb pull down capacity and 6.75 in diameter blast holes; and the blasted rock will be loaded into 100-ton haul trucks using three, 16-cubic yard front-end loaders.

The mine plan was developed with a phased approac ........

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