Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 6 years (as of Jan 1, 2022) |
The Gold Bar mine is an open pit, oxide gold mine with a processing facility, heap leach pad and gold recovery plant.
Current production is from the Pick and Ridge deposits, and in December 2022 the Company began mining from Gold Bar South deposit. |
Source:
p. 36
McEwen, through its wholly owned subsidiaries McEwen Mining Nevada Inc., WKGUS LLC, and Golden Pick LLC, controls 2,808 unpatented lode mining claims and one parcel of privately owned land in the Gold Bar Project area. The parcel consists of 10 patented lode claims(WI lode claims), which cover most of the Gold Pick and Gold Ridge resource area and was part of Atlas’ original land holdings.
Contractors
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Deposit Type
- Carlin-type
- Breccia pipe / Stockwork
- Carbonate hosted
Summary:
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.
Within the Gold Bar North (GBN) area, three gold deposits have been defined: Gold Pick, Gold Ridge and Cabin Creek. Mineralization in Gold Pick has a strike length of over 4,000 ft with a width of 1,600 ft and thickness of 100 – 150 ft. Gold Ridge and Cabin Creek are ancillary deposits comprising together approximately 22% of the mineral resource. All defined mineralization lies within 500 ft of surf ........
Summary:
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 64,700 tons/day (23,600 ktons/yr). The mine is scheduled to operate 7 days/wk with two, 12-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.
Waste rock will be stored in several waste rock ........
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Flow Sheet:
Summary:
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Reserves at December 31, 2022:
Mineral resources Cut-off grades are variable 0.0065-0.0121 g/t and based on the presence or not of clay content, carbon content and recoveries.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
5,943 kt
|
Gold
|
1.07 g/t
|
204 koz
|
|
Indicated
|
3,339 kt
|
Gold
|
0.78 g/t
|
83.9 koz
|
|
Inferred
|
1,391 kt
|
Gold
|
1.41 g/t
|
63 koz
|
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