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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
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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life27 years (as of Jan 1, 2021)
Key federal permits for the project received and state permitting is well-advanced.

Anticipated to be one of the highest gold producers in the industry.


Owners

Source: p. 11
CompanyInterestOwnership
Barrick Gold Corp. 50 % Indirect
Novagold Resources Inc 50 % Indirect
Donlin Gold LLC (operator) 100 % Direct
The Donlin Gold project is owned and operated by Donlin Gold LLC, a limited liability company in which wholly-owned subsidiaries of Novagold Resources Inc and Barrick Gold Corporation each own a 50% interest.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Intrusion related


Summary:

The Donlin mineralization model is a high-level, reduced intrusion-related vein system. The ACMA (ACMA is named after the American Creek magnetic anomaly)-Lewis part of the district is a low sulphidation, reduced intrusion related, epizonal system with both vein and disseminated mineral zones.

The Donlin 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 8.5 km long x 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 1.5 km wide x 3 km long cluster of gold deposits has an aggregate vertical range that exceeds 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. Sub-microscopic gold, contained prim ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The preferred development is for a 53,500 t/d process facility with on-site power; and a mine capacity of 440 kt/d with an elevated cut-off policy applied in the initial part of the mine life.

There is sufficient area within the Project to host an open pit mining operation, including the proposed open pits, mine and plant infrastructure, waste rock and tailings storage facilities.

Lewis Pit - Northeast Wall (Design Sector I-219)
Given the monoclinal dip of the sedimentary rocks in this area of the pit, where the bedding dips at an average of 43°, a standard 65° to 70° bench face would undercut bedding and likely result in instability. As a result, a footwall mining configuration has been recommended and will achieve the maximum slope angle in this area.

Stability analyses to assess standard potential footwall instability modes indicate that a 48 m high unbenched slope will be stable against buckling, bi-linear slab, and ploughing failures. To practically dewater this area and maintain adequate protection against rock and ice fall, a rockfall catchment berm should be placed every 48 m vertically. The berm will need to be a minimum of 8 m wide, increasing to 13 m wide at every second bench to accommodate water wells, horizontal drain hole collection systems, a rockfall catchment ditch / net, and a roadway with a 5 m wide running surface for service vehicles. This results in a 38° inter-ramp slope angle for this wall.

ACMA Pit ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 1,13030,405
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Daily mining capacity  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing capacity  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
* According to 2021 study.
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Reserves at April 27, 2021:
Mineral Resources: cut-off grade 0.47 g/t
Mineral Reserves: cut-off grade 0.57 g/t

CategoryTonnage CommodityGradeContained Metal
Proven 7,683 kt Gold 2.32 g/t 573 koz
Probable 497,128 kt Gold 2.08 g/t 33,276 koz
Proven & Probable 504,811 kt Gold 2.09 g/t 33,849 koz
Measured 7,731 kt Gold 2.52 g/t 626 koz
Indicated 533,607 kt Gold 2.24 g/t 38,380 koz
Measured & Indicated 541,337 kt Gold 2.24 g/t 39,007 koz
Inferred 92,216 kt Gold 2.02 g/t 5,993 koz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs (sold) Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
Subscription required - Subscription is required.

Operating Costs:

Units2021
OP mining costs ($/t mined) USD 2.58 *
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t mined) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t mined) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2021 study.
Subscription required - Subscription is required.

2021 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 6,916
G&A costs $M USD 1,762
Total OpEx $M USD  ......  Subscription required
Mining Taxes $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Net revenue (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
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Pipelines
TypeMaterialDiameterLengthDescription


Proposed Heavy Mobile Equipment as of June 1, 2021:
HME TypeModelSizeQuantity
Dozer (crawler) 850 HP ....................... Subscription required
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Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 30, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Dec 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 14, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 14, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Quarterly Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Quarterly Report 2018
Other 2017
Project Description 2016
Annual Report 2015
Feasibility Study Report 2011
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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