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United States
Arctic Project

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 Location:
36 km NE from Kobuk, Alaska, United States

  Project Contacts:
2311 Sheldon Avenue, Unit B
Fairbanks
Alaska, United States
99701
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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Copper
  • Zinc
  • Lead
  • Silver
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life13 years (as of Jan 1, 2023)
Arctic is potentially one of the highest-grade copper deposits known in the world with an estimated average grade of 5% copper equivalent.
Latest NewsTrilogy Metals Reports Multiple Intersections of High-Grade Copper, Zinc, Lead, Gold and Silver from 17 Drill Holes Completed in 2022 at the Arctic Project in Alaska     February 27, 2023


Owners

Source: p. 31
CompanyInterestOwnershipInvestor's Info
Trilogy Metals Inc. 50 % Indirect
South32 Limited 50 % Indirect
The Arctic Project is directly held by Ambler Metals LLC, in a 50/50 joint venture formed between South32 Limited and Trilogy Metals in February 2020.

Contractors

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Deposit Type

  • VMS


Summary:

Previous workers at the Arctic deposit (Russell 1995 and Schmidt 1983) describe three mineralized horizons: the Main Sulphide Horizon, the Upper South Horizon and the Warm Springs Horizon. The Main Sulphide Horizon was further subdivided into three zones: the southeast zone, the central zone, and the northwest zone. Previous deposit modelling was grade-based resulting in numerous individual mineralized zones representing relatively thin sulphide horizons.

Observations and interpretations at the Arctic deposit such as: 1) the tectonic setting with Devonian volcanism in an evolving continental rift; 2) the geologic setting with bimodal volcanic rocks including pillow basalts and felsic volcanic tuffs; 3) an alteration assemblage with well-defined magnesium-rich footwall alteration and sodium-rich hanging wall alteration; and 4) typical polymetallic base-metal mineralization with massive and semi-massive sulphides, are indicative of a Volcanogenic Massive Sulphide (VMS) deposit that has undergone high strain and complex folding and faulting.

The tonnage, grades, and stratigraphic setting of the Arctic deposit, and its broader tectonostratigraphic setting, are similar to other felsic siliclastic VMS environments globally. The deposit has strong similarities to deposits found the Finlayson Lake VMS district, Yukon, Bathurst district, New Brunswick, and some parts of the Iberian Pyrite Belt, Spain-Portugal (Piercey, 2022).

A VMS model is considered ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Arctic Project is designed as a conventional truck-shovel operation with 144 t trucks and 15 m3 shovels. The pit design includes four nested phases to balance stripping requirements while satisfying the concentrator requirements. The design parameters include a ramp width of 30 m, road grades of 10%, bench height of 5 m, targeted mining width between 70 and 100 m, berm interval of 20 m, variable slope angles by sector and a minimum mining width of 30 m.

According to SRK’s geotechnical recommendations, a large talc zone located in the northeast pit slope must be completely removed. To achieve this, a pit optimization giving dummy values to the talc zone blocks was performed. This pit optimization was used as the basis for the mine design.

The smoothed final pit design contains approximately 46.7 Mt of ore and 340.2 Mt of waste for a resulting stripping ratio of 7.3:1. Within the 46.7 Mt of ore, the average grades are 2.11% Cu, 2.90% Zn, 0.56% Pb, 0.42 g/t Au and 31.83 g/t Ag.

Interim Phase Design
The deposit is mined in four nested phases, including the ultimate pit limit. During pre-production, the phasing strategy maximizes waste mining while minimizing the ore tonnage. This is primarily due to the lack of space to build ore stockpiles. In addition, the phasing strategy maintains enough exposed ore to guarantee the continuous operation of the process plant during the production.

A stockpile is required to store the ore ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Concentrate kt 2342,995
Copper Payable metal M lbs 1491,933
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required
Zinc Payable metal M lbs  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Payable metal M lbs  ......  Subscription required  ......  Subscription required
Silver Payable metal koz  ......  Subscription required  ......  Subscription required
Gold Payable metal koz  ......  Subscription required  ......  Subscription required

* According to 2023 study.

Reserves at November 15, 2022:
Resources - the base case cut-off grade is 0.5% copper equivalent.
Reserves - a marginal NSR cut-off of $38.8 /t is used.

CategoryTonnage CommodityGradeContained Metal
Probable 46.7 Mt Copper 2.11 %
Probable 46.7 Mt Zinc 2.9 %
Probable 46.7 Mt Lead 0.56 %
Probable 46.7 Mt Silver 31.83 g/t
Probable 46.7 Mt Gold 0.42 g/t
Proven & Probable 46.7 Mt Copper 2.11 %
Proven & Probable 46.7 Mt Zinc 2.9 %
Proven & Probable 46.7 Mt Lead 0.56 %
Proven & Probable 46.7 Mt Silver 31.83 g/t
Proven & Probable 46.7 Mt Gold 0.42 g/t
Indicated 35.7 Mt Copper 2.98 % 2,347 M lbs
Indicated 35.7 Mt Zinc 4.09 % 3,216 M lbs
Indicated 35.7 Mt Lead 0.79 % 621 M lbs
Indicated 35.7 Mt Silver 45.2 g/t 52 M oz
Indicated 35.7 Mt Gold 0.59 g/t 675 koz
Inferred 4.5 Mt Copper 1.92 % 189 M lbs
Inferred 4.5 Mt Zinc 2.93 % 288 M lbs
Inferred 4.5 Mt Lead 0.7 % 69 M lbs
Inferred 4.5 Mt Silver 35.6 g/t 5 M oz
Inferred 4.5 Mt Gold 0.43 g/t 62 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper USD  ......  Subscription required *†
All-in costs Copper USD  ......  Subscription required *†
Assumed price Lead USD  ......  Subscription required&nbs
Assumed price Zinc USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2023 study / presentation.
† Net of By-Product.
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2023 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 1,055
G&A costs $M USD 273
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Pipelines and Water Supply
Source: Subscription required

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Proposed Heavy Mobile Equipment as of January 20, 2023:
HME TypeSizeQuantity
Backhoe 1.4 cu. m ....................... Subscription required
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Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 20, 2023
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Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Feasibility Study Report 2023
Press Release 2023
Corporate Presentation 2022
Other 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2020
Corporate Presentation 2017
Form 10-K 2017
Press Release 2017
Technical Report 2017
Corporate Presentation 2016
Corporate Presentation 2016
Preliminary Economic Assessment 2013
Subscription required - Subscription is required.

News:

NewsDate
Trilogy Metals Reports Multiple Intersections of High-Grade Copper, Zinc, Lead, Gold and Silver from 17 Drill Holes Completed in 2022 at the Arctic Project in Alaska February 27, 2023
Trilogy Metals Announces Updated Feasibility Study Results for the Arctic Project February 14, 2023

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