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United States
Donlin Gold Project

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 Location:
20 km N from Crooked Creek, Alaska, United States

  Project Contacts:
2525 C St., Suite 450
Anchorage
Alaska, United States
99503
Phone  ...  Subscription required
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation
  • Counter current decantation (CCD)
  • Concentrate leach
  • Pressure oxidation
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life27 years (as of Jan 1, 2017)
Latest NewsDonlin Gold Announces Assay Results From Remaining 30 Percent of the 2020 Drill Program, Consistent With Previously Reported Results...     March 25, 2021


Owners

Source: p. 21
CompanyInterestOwnership
Barrick Gold Corp. 50 % Indirect
Novagold Resources Inc 50 % Indirect
Donlin Gold LLC 100 % Direct
The Donlin Gold project is an advanced-stage gold project held by Donlin Gold, a limited liability company that is owned 50% by our wholly-owned subsidiary, NOVAGOLD Resources Alaska Inc., and 50% by Barrick’s wholly-owned subsidiary, Barrick Gold U.S. Inc.

Deposit Type

  • Vein / narrow vein
  • Intrusion related


Summary:

The Donlin mineralization model is a high-level, reduced intrusion-related vein system. The Lewis–ACMA part of the district is a low sulphidation, reduced intrusion related, epizonal system with both vein and disseminated mineral zones.

The Donlin gold deposits lie in the central Kuskokwim basin of southwestern Alaska, which contains a back-arc continental margin basin fill assemblage of the Upper Cretaceous Kuskokwim Group, and Late Cretaceous volcano-plutonic complexes. The Project area is underlain by a 5 mile (8.5 km) long x 1.5 mile (2.5 km) wide granite porphyry dike and sill swarm hosted by lithic sandstone, siltstone, and shale of the
Kuskokwim Group.

The deposits are hosted primarily in igneous rocks and are associated with an extensive Upper Cretaceous gold–arsenic–antimony–mercury hydrothermal system. The northeast, elongated, roughly 5,000 ft (1.5 km) wide x 10,000 ft (3 km) long cluster of gold deposits has an aggregate vertical range that exceeds 3,100 ft (945 m). These areas consist of the ACMA and 400 Zone, Aurora and Akivik mineralized areas (grouped as ACMA) and the Lewis, South Lewis, Vortex, Rochelieu and Queen mineralized areas (grouped as Lewis).

Gold occurs primarily in sulphide and quartz–carbonate–sulphide vein networks in igneous rocks and, to a much lesser extent, in sedimentary rocks. Broad disseminated sulphide zones formed in igneous rocks where vein zones are closely spaced. Submicroscopic gold, contained primarily in arsenopyrite and secondarily in pyrite and marcasite, is associated with illite–kaolinite–carbonate–graphite-altered host rocks.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining will use a conventional truck-and-shovel fleet. Large electric hydraulic shovels mining the full 40 ft (12 m) benches will be the primary loading equipment in zones of waste and steeply-dipping ore. The same primary shovels will be used on the 20 ft (6m) split benches, thereby avoiding the need for a mixed fleet of hydraulic shovels. All shovels will be equipped with GPS positioning to allow real-time updates of the digging face and delineation of the ore–waste contacts. Large front-end loaders (FELs) will be used as a backup to the shovels and to work on less-productive faces and muckpile cleanup. Large 400 st (360 t) capacity haul trucks will be used for transporting both ore and waste out of the pit. All trucks will be equipped with a GPS dispatch system for tracking ore and waste from the mine face to the designated stockpiles or dumps. The mine and fleet design is appropriate for the Mineral Reserves defined.


Crushing and Grinding


Processing

  • Flotation
  • Counter current decantation (CCD)
  • Concentrate leach
  • Pressure oxidation
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The process is based on conventional technology. The concentrator, pressure oxidation, and cyanidation facilities will be at the forefront of technology for large, modern gold processing plants.

Mine haul trucks (with capacities to 380 st (345t)) will dump run-of-mine (ROM) open pit ore directly into dump hoppers ahead of a 60" x 89" gyratory crusher.

The overall grinding configuration will consist of an open-circuit SAG mill followed by the “mill-chemical-float-mill-chemical-float” (MCF2) circuit. The MCF2 circuit will entail a primary ball mill followed by primary rougher flotation; the tailings produced from primary flotation will be sent to a secondary ball mill, followed by a secondary rougher flotation. The two individual ball mills will operate in a closed circuit with their respective classification cyclones.

Donlin ore contains a mixture of intrusive and sedimentary rock containing sulphide mineralization. The optimum gold recovery will be a ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 2.09
Subscription required - Subscription is required.

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Payable metal M oz 30
Gold Metal in doré M oz 1.130

Operational Metrics:

Metrics
Stripping / waste ratio 5.46 *
Daily mining capacity 440 kt *
Daily milling capacity 53.5 kt *
Ore tonnes mined, LOM 504.81 Mt *
Total tonnes mined, LOM 3,260 Mt *
Tonnes milled, LOM 504.81 Mt *
Annual milling capacity 19,528 kt *
* According to 2011 study.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Measured 7,730 kt Gold 2.52 g/t 626 koz
Indicated 533,606 kt Gold 2.24 g/t 38,380 koz
Measured & Indicated 541,336 kt Gold 2.24 g/t 39,006 koz
Inferred 92,216 kt Gold 2.02 g/t 5,994 koz

Commodity Production Costs:

CommodityUnits2021
Total cash costs Gold USD 585 / oz *
Assumed price Gold USD 1,200 / oz *
* According to 2011 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2020
OP mining costs ($/t milled) USD 16.2 *
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2011 study.
Subscription required - Subscription is required.

Financials:

Units2019
Capital expenditures M USD  ......  Subscription required
Subscription required - Subscription is required

2011 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 7,808
Refining costs $M USD  ......  Subscription required
G&A costs $M USD 1,626
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
EBITDA (LOM) $M USD  ......  Subscription required
Net Income (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of November 18, 2011:
HME TypeModelQuantity
Bulldozer ....................... Subscription required 6
....................... Subscription required ....................... Subscription required 4
....................... Subscription required ....................... Subscription required 6
....................... Subscription required ....................... Subscription required 6
....................... Subscription required ....................... Subscription required 15
....................... Subscription required ....................... Subscription required 10
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 10
....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 7
....................... Subscription required ....................... Subscription required 69
....................... Subscription required ....................... Subscription required 10
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 18, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Quarterly Report 2018
Other 2017
Annual Report 2015
Feasibility Study Report 2011
Subscription required - Subscription is required.

News:

NewsDate
Donlin Gold Announces Assay Results From Remaining 30 Percent of the 2020 Drill Program, Consistent With Previously Reported Results... March 25, 2021
Barrick Gold Corp.: Donlin Gold 2020 Q3 Update: Drilling Continues to Yield High Grade Intercepts and Improve Geological Modeling October 26, 2020
Barrick Gold Corp.: Donlin Gold Project Provides Update on Recent Drilling and Ongoing Community Support in Alaska Amid COVID-19 Pandemic August 6, 2020
NOVAGOLD Resources: Donlin Gold Project Receives Record of Decision and Major Federal Permits August 14, 2018

Subscription required - Subscription is required.

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