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United States
Long Canyon Mine (Nevada Gold Mines Operation)

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 Location:
104 km E from Elko, Nevada, United States

  Regional Office:
1655 Mountain City Highway
Elko
Nevada, United States
89801
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
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  • Mining
  • Processing
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  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Counter current decantation (CCD)
  • Carbon in column (CIC)
  • Cyanide (reagent)
Mine Life8 years (as of Jan 1, 2016)


Owners & OPERATOR

Source: p. 60
CompanyInterestOwnership
Newmont Corp. 38.5 % Indirect
Barrick Gold Corp. (operator) 61.5 % Indirect
Nevada Gold Mines LLC 100 % Direct
On March 10, 2019, Barrick entered into an implementation agreement with Newmont to create a joint venture, named Nevada Gold Mines. This includes Barrick’s Cortez, Goldstrike, Turquoise Ridge and Goldrush properties and Newmont’s Carlin, Twin Creeks, Phoenix, Long Canyon and Lone Tree properties. Barrick is the operator of the joint venture and owns 61.5%, with Newmont owning the remaining 38.5% of the joint venture.

Deposit Type

  • Carlin-type
  • Sediment-hosted


Summary:

Long Canyon is a sediment-hosted disseminated gold deposit.

The gold mineralization at Long Canyon is best described as sediment-hosted, Carlin-type gold mineralization.

The mineralization identified at Long Canyon shares many of the characteristics of Carlin-type gold mineralization, including:

• Stratigraphic control on mineralization - mineralization is hosted primarily in limestone, particularly in silty, thin-bedded units;

• Structural control on mineralization - mineralization occurs in karstic cavities, collapse breccias, and anticlinal fold hinges;

• Geochemical association - elevated arsenic, mercury, antimony, and thallium accompany the gold mineralization, while silver and base-metal concentrations are low; and

• Alteration - mineralization is associated with decalcification, silicification/jasperoid, oxidized variants of pyrite and arsenical pyrite or arsenopyrite, and clay alteration.

The Long Canyon project also displays some characteristics that are unlike typical Carlin-type gold deposits. The prevalent association of hematite with gold mineralization at Long Canyon is not a common characteristic among all Carlin-type deposits, although this phenomenon is associated with weathered/oxidized portions of some of the deposits.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Long Canyon is an open pit operation located approximately 75 miles east of Elko, Nevada.


Crushing and Grinding


Processing

  • Heap leach
  • Counter current decantation (CCD)
  • Carbon in column (CIC)
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Oxide ore with suitable cyanide solubility is treated on a heap leach pad.

Long Canyon is permitted to process up to 5 million tons of ore annually, with developments that consist of:
* an open pit;
* a heap leach facility (HLF);
* a carbon-in-column (CIC) plant;
* a waste rock storage facility (WRSF); and
* support facilities including a truck shop and administration building.

A dilute sodium cyanide solution is applied to the stacked ore on the high-density polyethylene (HDPE) lined leach pads. Pregnant solution from the leach pads is collected in perforated piping under the leach pad, and reports to main collection headers that lie in a HDPE-lined Solution Collection Channel along the edge of the heap leach pad. The collection headers report to a Pregnant Solution Tank (PST), and a Process Solution Pond (PSP) is available for solution in case of upset plant operating conditions. The PSP has a total capacity of 17.4 million gallons, and ........

Recoveries & Grades:

CommodityParameter2019
Gold Head Grade, g/t 1.04

Production:

CommodityUnits20202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required17422
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019
Total tonnes mined  ......  Subscription required
Ore tonnes mined  ......  Subscription required
Waste  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Tonnes processed  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 0.42 Mt Gold 2.23 g/t 0.03 M oz
Probable 7.47 Mt Gold 2.49 g/t 0.6 M oz
Proven & Probable 7.97 Mt Gold 2.48 g/t 0.63 M oz
Measured 1.2 Mt Gold 3.83 g/t 0.15 M oz
Indicated 19.5 Mt Gold 3.29 g/t 1.95 M oz
Inferred 2.92 Mt Gold 2.1 g/t 0.2 M oz

Commodity Production Costs:

CommodityUnits20202019201820172016
Total cash costs Gold USD  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required ^†  ......  Subscription required†
Total cash costs (sold) Gold USD  ......  Subscription required† 338 / oz† 186 / oz†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^†  ......  Subscription required†
All-in sustaining costs (sold) Gold USD  ......  Subscription required† 364 / oz† 227 / oz†
All-in costs Gold USD  ......  Subscription required
All-in costs Gold USD  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2019
OP mining costs ($/t mined) USD 1.76
Processing costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units20192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 128  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -22  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2018:
HME TypeSizeQuantity
Shovel (hydraulic) 2
Truck (haul) 240 tons 12

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2020
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Form 10-K 2016
Year-end Mineral Reserves 2016
Form 10-K 2015
Other 2015
Year-end Mineral Reserves 2015
Other 2012
Other 2012
Preliminary Economic Assessment 2009
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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