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United States
Goldrush Project

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 Location:
97 km SW from Elko, Nevada, United States

  Project Contacts:
HC66 Box 1250
Crescent Valley
Nevada, United States
89821
Phone  ...  Subscription required
Fax(775)-468-4496
WebsiteWeb
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Overview

StagePermitting
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Drift & Fill
  • Longhole open stoping
  • Cemented backfill
Production Start...
Mine Life20 years (as of Jan 1, 2021)
Starting in the first quarter of 2021, Goldrush was included as part of Cortez as management began reviewing the operating results and assessing performance on a combined level.

During 2022, underground development, bulk sampling, test mining, and other exploration will continue at Goldrush.

Permitting activities continued to advance largely on-track. Barrick continues to expect receipt of a Record of Decision (“ROD”) in the fourth quarter of 2022, which is reflected in the current mine plan.

Subject to the ROD, the development of Goldrush is expected to achieve commercial production in 2025.


Owners

Source: p. 75-76
CompanyInterestOwnership
Newmont Corp. 38.5 % Indirect
Barrick Gold Corp. (operator) 61.5 % Indirect
Starting in the first quarter of 2021, Goldrush was included as part of Cortez.
On March 10, 2019, Barrick entered into an implementation agreement with Newmont to create a joint venture, named Nevada Gold Mines.
On July 1, 2019, Cortez was contributed to Nevada Gold Mines, a joint venture with Newmont.

Barrick is the operator of the joint venture and owns 61.5%, with Newmont owning the remaining 38.5% of the joint venture.

Contractors

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Deposit Type

  • Sediment-hosted
  • Carlin-type


Summary:

Goldrush deposit is part of the Cortez deposits, which are Carlin-type sedimentary rock-hosted deposits.

Exploration currently reveals that the deposit has a maximum thickness of 76 m, a width of about 425 m, and extends along strike for approximately 5,275 m. The deepest significant intercept is currently at 1,435 masl. The Goldrush system remains open to the north into Fourmile, to the southeast, and in multiple directions in the Ken Balleweg (KB) Domain.

Exploration to date shows that mineralization at Goldrush is primarily stratigraphically controlled, occurring within subunit 5 of the middle Wenban Formation and to a lesser extent along the contact between the Horse Canyon and Wenban formations.

Mineralization is associated with low-angle thrust faults and their related hanging wall antiforms that typically concentrate gold along fold hinges and/or east-dipping limbs. Gold occurs within extensive zones of decarbonatization and silicification within the Devonian rocks.

The system is marked by a large stratiform silicified and sulfidized breccia horizon from 15– 70 m thick that extends more than 7,000 m on a north–northwesterly strike.

Mineralization
The main gold-bearing mineral is micrometre-sized arsenian pyrite that occurs as individual grains or as rims on pre-existing pyrite. Mineralization is primarily double-refractory and highly preg-robbing with both sulfides and active carbon present in the orebody. ........


Mining Methods

  • Drift & Fill
  • Longhole open stoping
  • Cemented backfill


Summary:

The proposed method for mining the majority of the Goldrush deposit is small to moderate sized longhole stopes with cemented paste fill. The stopes will be extracted on a transverse primary/secondary system with (where possible), a continuous mining front. The mining direction is not fixed since the geotechnical and geometric conditions vary with each sub-area within the Goldrush complex.

Due to the mine access infrastructure being located on the western edge of the deposit, all cross cuts are mined from west to east. Considering this factor and the requirement to maintain a consistent mining front, the primary stopes will be extracted in a continuous sequence from east to west, top-down (where applicable) and from south to north. Once the second level of primary stopes are extracted and backfilled extraction of the secondary stopes can commence. The secondary stopes effectively follow the primary sequence.

Based on Mineral Reserves only, approximately 13% of the ore is produced from ore drive and drift-and-fill drive development, with the remaining 87% produced from longhole production stopes.

Each of the sub-areas within Goldrush were planned to be extracted in a regional sense from south to north. The five sub-areas were identified as:
• Red Hill;
• Crow’s Nest;
• 3½;
• Ranch;
• Meadow.

Mining is planned to commence in the Red Hill Zone as this will be the first area to be accessed from the twin decli ........


Crushing and Grinding
Flow Sheet: Source

ROM ore is dumped into the crusher dump pocket at the mill and discharges onto a vibrating grizzly. Grizzly oversize material is crushed in a jaw crusher. Grizzly undersize material and the jaw crusher discharge are conveyed to the coarse ore stockpile. The coarse ore is conveyed to the SAG mill and lime is added to the belt based on ore requirements. The grinding circuit includes one SAG mill and one ball mill. Discharge from the SAG mill is screened on one of two vibrating screens.

Screen oversize is conveyed to a cone crusher where it is crushed prior to being recycled to the SAG mill feed. Screen undersize and ball mill discharge flow by gravity to the hydrocyclone feed pump box. The slurry is pumped from the pump box to the hydrocyclones. The ball mill is operated in closed circuit with the hydrocyclones to produce the target grind size for the CIL circuit, which is nominally 150 µm. The underflow from the hydrocyclones is recycled to the ball mill feed; the overflow from the hydrocyclones discharges into an agitated surge tank, which feeds the grind thickener. Cyanide is added to the surge tank to being the leaching process prior to the grind thickener. Milk of lime can also be added to the surge tank if the lime silo is down, and dry lime cannot be added to the belt.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. Annual
Gold oz 440,000
All production numbers are expressed as metal in doré.


Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Probable 32.5 Mt Gold 7.29 g/t 7.8 M oz
Indicated 37 Mt Gold 7.07 g/t 8.5 M oz
Inferred 23 Mt Gold 6 g/t 4.5 M oz

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold USD 665 / oz *  
* According to 2016 study / presentation.

2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelQuantity
Bolter ....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Aug 10, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Other 2018
Press Release 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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