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United States
White Pine North Project

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 Location:
22 km SW from Ontonagon, Michigan, United States

  Project Contacts:
1111 St-Charles West West Tower, Suite 101
Longueuil
Quebec, Canada
J4K 5G4
Phone  ...  Subscription required
Fax+1-450-677-2601
EmailEmail
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeUnderground
Commodities
  • Copper
  • Silver
Mining Method
  • Room-and-pillar
Mine Life25 years (as of Jan 1, 2019)


Owners

Source: p. 1
CompanyInterestOwnership
Highland Copper Company Inc. 100 % Indirect
July 27, 2021 – Highland Copper Company Inc. (TSXV: HI, OTCQB: HDRSF) (the “Company” or “Highland”) is pleased to announce that it has completed the acquisition of the White Pine North Project in Michigan. All the conditions have been met and the documents necessary to complete the acquisition of the project from Copper Range Company (“CRC”), a wholly owned subsidiary of First Quantum Minerals Ltd., have been executed.

As part of the transaction with CRC, White Pine Copper LLC (“WPC”), a wholly owned subsidiary of Highland, has agreed to assume all benefits, duties, and obligations of CRC under a judicial Consent Decree entered in 1997 and subsequently amended, concerning the White Pine mining facility formerly operated by CRC.

Contractors

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Deposit Type

  • Sediment-hosted


Summary:

The mineralization of the White Pine North Project is classified as a reduced facies stratiform sediment-hosted copper deposit.

Copper mineralization at the White Pine deposit occurs in two modes - as very fine-grained sulfide (chalcocite) and as native copper. Sulfide mineralization is estimated to account for 85-90% of the copper in the deposit, but both modes of copper are intimately associated throughout the deposit. The copper mineralization at White Pine is unusually consistent. All drill holes within the deposit intercepted mineralized strata. Within the deposit, the grades of the mineralization are usually above cut-off grade over normal mining configurations. Most of the beds in the mineralized horizon are continuous over the entire deposit. The beds comprising the Parting Shale pinch out in the southwest part of the historic mine. The variation of the thickness of mineralized beds is also low from drill hole to drill hole.

Sulfide Mineralization: The dominant copper mineral in the White Pine deposit is chalcocite (Cu2S). It occurs as fine-grained lamellae in laminites and partings in interbedded sandstone and shale, very-fine grained disseminations and discrete clots in siltstone, and in veinlets and veins. The top of the copper mineralization is identified as the Top of Mineralization (“TOM”) Line or “fringe,” a narrow transition zone between cupriferous and pyritic zones. The fringe is typically very narrow (a few inches) and is identified b ........


Mining Methods

  • Room-and-pillar


Summary:

Based on geotechnical information, White Pine mine history and mineralization geometry, an underground room-and-pillar method is selected for the White Pine North deposit. This mining method allows for both a good ore selectivity and productivity. However, a series of pillars are left in place to provide roof stability. The mining design was based on a mining rate of approximatively 5.4 Mt/yr. Historically the old White Pine Mine has reached the proposed mining rate. In addition, many assumptions are based on historical data from the old White Pine Mine.

- The production schedule is based on mining a fixed target of 5.4 Mt/yr. To achieve this annual production, seven to fourteen production panels must be in production simultaneously;

- The mining method consists of the extraction of a series of entries and cross cuts in the ore leaving pillars in place to support the back. The entries, cross cuts and pillars are sized using a geotechnical analysis of the rock, and experience from the old White Pine Mine with similar ground conditions.

- No geotechnical investigation has been conducted on the underground operations at White Pine North since the closure of the former White Pine Mine. The previous geotechnical work carried out during the operation of the old white pine mine was analyzed and it was used to produce this preliminary study. In addition, a back analysis of the old White Pine was done by Itasca at the beginning of the project;


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Copper Payable metal M lbs 892,224
Copper Metal in concentrate M lbs 2,305
Copper Concentrate kt 3,421
Silver Payable metal koz  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required

Operational Metrics:

Metrics
Waste tonnes, LOM 1,060 kt *
Ore tonnes mined, LOM 121,405 kt *
Total tonnes mined, LOM 122,465 kt *
Daily processing capacity 15,000 t *
Tonnes processed, LOM 121,405 kt *
Annual ore mining rate 5.4 Mt *
* According to 2019 study.

Reserves at August 30, 2019:
A cut-off grade of 0.9% Cu was used based on an underground “room and pillar” mining scenario.

CategoryTonnage CommodityGradeContained Metal
Indicated 133.4 Mt Copper 1.07 % 3,154 M lbs
Indicated 133.4 Mt Silver 14.9 g/t 63.8 M oz
Inferred 97.2 Mt Copper 1.03 % 2,210 M lbs
Inferred 97.2 Mt Silver 8.7 g/t 27.2 M oz

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Copper USD  ......  Subscription required&nbs
C1 cash costs Copper USD  ......  Subscription required *†
C3 fully allocated costs Copper USD  ......  Subscription required *†
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Silver USD  ......  Subscription required&nbs
* According to 2019 study / presentation.
† Net of By-Product.

Operating Costs:

Units2019
UG mining costs ($/t milled) USD 17 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 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
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 740
Refining costs $M USD  ......  Subscription required
Transportation (haulage) costs $M USD 260
G&A costs $M USD 193
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
Gross revenue (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 0% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 0% $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
Subscription required - Subscription is required.

Pipelines
TypeMaterialDiameterLengthDescription


Proposed Heavy Mobile Equipment as of November 6, 2019:
HME TypeSizeQuantity
Bolter ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 6, 2019
....................... Subscription required ....................... Subscription required Subscription required Nov 6, 2019
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 7, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 7, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2019
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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