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United States
Tamarack North Project

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 Location:
77 km W from Duluth, Minnesota, United States

  Project Contacts:
165 Warren St.
Tamarack
Minnesota, United States
55787
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Nickel
  • Copper
  • Cobalt
  • Platinum
  • Palladium
  • Gold
Mining Method
  • Drift & Fill
  • Longhole open stoping
  • Transverse stoping
  • Paste backfill
Production Start...
Mine Life9 years (as of Jan 1, 2021)
Talon plans to produce the world’s most responsible, lowest environmental footprint nickel concentrates that will be the feedstock for both nickel and Lithium Iron Phosphate (LFP) batteries.


Owners

Source: p. 15
CompanyInterestOwnership
Rio Tinto plc 49 % Indirect
Talon Metals Corp. (operator) 51 % Indirect
The Tamarack Project is currently 51% owned by Talon Metals Corp. through its wholly-owned indirect subsidiary, Talon Nickel (USA) LLC (collectively, Talon), and 49% owned by Kennecott Exploration Company (Kennecott), an indirect wholly-owned subsidiary of Rio Tinto.

On November 7, 2018, Talon and Kennecott entered into an exploration and option agreement (the 2018 Tamarack Earn-in Agreement) pursuant to which Talon has the right, subject to certain funding and reporting obligations, to increase its interest in the Tamarack Project to a maximum 60% interest. The 2018 Tamarack Earn-in Agreement came into effect on March 13, 2019 (the Kennecott Agreement Effective Date) and Talon is the operator of the Tamarack Project.

Contractors

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Deposit Type

  • Magmatic
  • Intrusion related


Summary:

The Tamarack North Project hosts magmatic Ni-Cu-Co sulphide mineralization with associated PGEs and Au. These deposits form as the result of segregation and concentration of liquid sulphide from mafic or ultramafic magma and the partitioning of chalcophile elements into the sulphide from the silica melt (Naldrett, 1999).

The various mineralized zones at the Tamarack North Project occur within different host lithologies, exhibit different types of mineralization styles, and display varying sulphide concentrations and tenors. These mineralized zones range from massive sulphides hosted by altered sediments in the MSU, to net textured and disseminated sulphide mineralization hosted by the CGO in the SMSU; to a more predominantly disseminated sulphide mineralization, as well as layers of net textured sulphide mineralization, in the 138 Zone. Mineralization in the 138 Zone, where interlayered disseminated and net textured mineralization occurs, is referred to as MZNO mineralization. All these mineralization types are typical of many magmatic sulphide deposits around the world. The current known mineralized zones of the Tamarack North Project (SMSU, MSU,138 Zone and the recently discovered CGO East and CGO West) that are the basis of the resource statement are referred to as the Tamarack Resource Area. Also located within the Tamarack North project are currently lesser defined mineral zones, namely the 480 Zone, the 221 Zone, and the 164 Zone, which have not been evaluate ........


Mining Methods

  • Drift & Fill
  • Longhole open stoping
  • Transverse stoping
  • Paste backfill


Summary:

The Tamarack North deposit will be mined using both bulk and selective underground mining methods. The underground mine design framework and execution strategy is the same for both the Ni Concentrate and Ni Sulphate Scenarios.

Long hole mining has been selected as the primary mining method for all areas with the exception of a portion of the MSU, which is better suited to drift-and-fill due to the shape of the deposit.

Bulk Mining
The primary mining method for each zone is transverse long hole open stoping with cemented paste backfill. Stopes are orientated E/W in the Upper SMSU and Lower SMSU and N/S in the 138 deposit. The typical stope size is 15 m wide by 25 m high.

Long hole stopes will be mined in a bottom-up, primary/secondary sequence, with primary stopes designed four stope widths apart, and generally adhere to the following design basis:
• Accessed from a FW drive from waste cross cuts driven with a road header on 15 m spacing;
• Both upper and lower sill drives are driven with a road header from the FW drives, to the extents of the deposit using a road header. In the case where lower stopes have been mined and filled, the upper sill drift remaining from the bottom stope is utilized as the lower sill drift in subsequent levels;
• Stopes will be mined from HW to FW and generally be no longer than 30 m;
• Stopes will be mined in a “primary-secondary” sequence from the bottom levels and advancing upwards, tren ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityUnitsAvg. Annual
Nickel kt 142
Copper kt  ......  Subscription required
All production numbers are expressed as concentrate.

Operational Metrics:

Metrics
Daily ore mining rate  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Daily production capacity  ......  Subscription required
Daily production capacity  ......  Subscription required
Daily processing capacity  ......  Subscription required
Daily processing rate  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2021 study.
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Reserves at October 10, 2022:
The Mineral Resources estimate is reported at a 0.5% Ni cut-off.

CategoryTonnage CommodityGrade
Indicated 8,564 kt Nickel 1.73 %
Indicated 8,564 kt Copper 0.92 %
Indicated 8,564 kt Cobalt 0.05 %
Indicated 8,564 kt Platinum 0.34 g/t
Indicated 8,564 kt Palladium 0.21 g/t
Indicated 8,564 kt Gold 0.17 g/t
Indicated 8,564 kt Nickel Equivalent 2.34 %
Inferred 8,461 kt Nickel 0.83 %
Inferred 8,461 kt Copper 0.55 %
Inferred 8,461 kt Cobalt 0.02 %
Inferred 8,461 kt Platinum 0.23 g/t
Inferred 8,461 kt Palladium 0.13 g/t
Inferred 8,461 kt Gold 0.13 g/t
Inferred 8,461 kt Nickel Equivalent 1.19 %

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Nickel USD  ......  Subscription required&nbs
Site cash costs (produced) Nickel USD  ......  Subscription required&nbs
Site cash costs (produced) Nickel USD  ......  Subscription required *†
All-in sustaining costs (AISC) Nickel USD  ......  Subscription required *†
C1 cash costs Nickel USD  ......  Subscription required *†
Assumed price Palladium USD  ......  Subscription required&nbs
Assumed price Platinum USD  ......  Subscription required&nbs
Assumed price Cobalt USD  ......  Subscription required&nbs
Assumed price Nickel USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2021 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2021
UG mining costs ($/t milled) USD 27.5 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/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
Working capital $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 153.3
Refining costs $M USD  ......  Subscription required
Transportation (haulage) costs $M USD 107.2
G&A costs $M USD 40.5
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net 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 @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 10% $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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Water Supply

A water management plan will be developed, detailing a strategy for managing water in a manner consistent with environmental requirements related to both water quantity and water quality. The water management plan will be designed to avoid, minimize and mitigate adverse changes in surface water hydrology and confirm compliance with surface and groundwater water quality standards.

Further work is required to assess potential water sources. Trade-off studies of Water Treatment Plant options will be conducted in future study.

During operations, water entering the site and potentially contacting reactive materials (called contact water) will need to be managed. Contact water sources include mine water inflow, water consumed during normal mine operations, precipitation within the contact area of the site, seepage through the Temporary Development Rock Storage Area and CFTF. The site is located in an area with relatively high precipitation including both rain and snow. During operations, all contact water will be collected and either used in ore processing, stored, or treated to permit limits prior to discharge to the environment.

Water management post mine closure will be greatly reduced compared to the management needs during operations. Sources of contact water will be removed with the completed reclamation; the mine excavation will be backfilled, and infrastructure and storage piles removed. The CFTF will be covered with a composite closure cover system that limits infiltration into the CFTF and associated drainage, reducing long-term water treatment needs.

The total water requirements of the grinding and flotation circuit are estimated at 543.0 m3 /h. This water requirement includes water addition in the grinding circuit, dilution water, and launder water. The mineralized material is assumed to contain a moisture content of at least 3% or 5.0 m3/h.

All process water that is recovered in the dewatering circuits of the two concentrates and two tailings streams are returned to the process water tank. The water in the concentrate and tailings streams amounts to 35.3 m3/h.

The total amount of reclaimed water is projected to be 426.0 m3/h. Hence, the freshwater requirement to make up the water deficit is 117.0 m3/h, which includes an allowance of 35.0 m3 /h of fresh water for gland water, potable water, reagent makeup, etc.


Proposed Heavy Mobile Equipment as of January 8, 2021:
HME TypeModelSizeQuantity
ANFO Loader ....................... Subscription required
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....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 8, 2021
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2023
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Report 2022
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Preliminary Economic Assessment 2018
Press Release 2018
Subscription required - Subscription is required.

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