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United States
Idaho Cobalt Operations (ICO) Project

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 Location:
35 km W from Salmon, Idaho, United States

  Project Contacts:
1309 S. Challis Street
Salmon
Idaho, United States
83467
Phone  ...  Subscription required
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Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Cobalt
  • Copper
  • Gold
Mining Method
  • Back stoping
  • Sill mining
  • Paste backfill
Production Start...
Mine Life7 years (as of Jan 1, 2020)
The mine is commencing a commissioning phase during October, with equipment undergoing final completion testwork ahead of continuous commercial concentrate production expected across Q4 2022. Full nameplate capacity remains expected by the end of Q1 2023.
Latest NewsJervois suspends final construction at Idaho Cobalt Operations     March 29, 2023


Owners

Source: p. 28
CompanyInterestOwnership
Jervois Global Ltd. 100 % Indirect
The ICO Property is 100% owned by Jervois Mining USA, a wholly owned subsidiary of Jervois.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein
  • Sediment-hosted


Summary:

The Ram deposit is one of the two deposits part of the ICO, the other being Sunshine. Stratigraphy in the Ram deposit area is predominantly medium- to fine-grained metagreywacke (previously described as quartzite) metamorphosed to upper greenschist to amphibolite facies. Stratigraphically, the Ram deposit is subdivided into three zones: Hanging wall, Main and Footwall zones, with each zone containing distinct mineralized horizons.

Sunshine is the second deposit part of the ICO. Stratigraphy, including the BTE horizons, strikes north northwest and dips moderately to steeply to the east-northeast. Individual sulphide-bearing beds may not be continuous over a distance of a few hundred feet. Still, generally, the overall mineralized zones within the BTE horizons can be traced along strike for over 500 m (~1,500 ft).

Mineralization at the ICO is of Type 1 characterized as syngenetic, stratiform/tabular exhalative deposits; however, the presumably associated mafic sequences of the Apple Creek Formation have not been identified at this time. This mineralization is dominantly bedding concordant, and the deposits range from nearly massive to disseminated. Some crosscutting mineralization is present that may be in feeder zones to the stratiform mineralization or may be due to remobilization locally into fracture quartz veins and/or crosscutting structures.

Dominant minerals include cobaltite (CoAsS) and chalcopyrite (CuFeS2). Other minerals present in ........


Mining Methods

  • Back stoping
  • Sill mining
  • Paste backfill


Summary:

The mining methods proposed for the ICO are overhand longitudinal short hole back stoping from 12 ft high sills spaced 36 ft vertically.

The selection of these mining methods for the deposit was determined primarily by the geometry of the mineralised horizons, including factors such as its continuity, dip and width, and the geotechnical parameters of the rock mass.

The ICO is composed of numerous parallel mineralised horizons, with thickness ranging from one foot to more than 12 ft, at an average dip of 55° (Orix 2020). Currently, only the main mineralised horizon (“MMH”) contains the majority of the mineralisation is considered in the mine design, plan and mineral reserve as all of the measured and indicated resource lies within this zone of mineralisation.

The sills and backstops will be completely filled with waste rock and cementitious paste fill. Mining sequencing will be overhand with fully paste filled sills forming crowns to terminate the overhand back stoping in a final retreat blind back stope. The mining method significantly reduces the risk of variability in the orebody through detail mapping and sampling of the orebody from the sills to be developed under geologic control.

The ratio of mineral reserve that will be extracted through short hole back stoping and sill mining methods is 62% and 38% respectively. In combination, these two mining methods provide a production capacity in the underground mine that is higher tha ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Cobalt Concentrate kt 124
Cobalt Payable metal kt 9.3
Copper Payable metal t  ......  Subscription required
Gold Payable metal oz  ......  Subscription required
Cobalt Metal in concentrate kt 1.9
Copper Metal in concentrate t  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required

Operational Metrics:

Metrics
Daily milling capacity  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at January 20, 2020:
The Cobalt cut-off grade for inclusion in the resource is 0.15%, no consideration of copper or gold content was used in determination of cut-off grade.

CategoryTonnage CommodityGradeContained Metal
Proven 1.44 Mt Cobalt 0.56 % 17.9 M lbs
Proven 1.44 Mt Copper 0.67 % 21.2 M lbs
Proven 1.44 Mt Gold 0.53 g/t 24,633 oz
Probable 1.05 Mt Cobalt 0.53 % 12.3 M lbs
Probable 1.05 Mt Copper 0.96 % 22.3 M lbs
Probable 1.05 Mt Gold 0.8 g/t 26,758 oz
Proven & Probable 2.49 Mt Cobalt 0.55 % 30.1 M lbs
Proven & Probable 2.49 Mt Copper 0.8 % 43.6 M lbs
Proven & Probable 2.49 Mt Gold 0.64 g/t 51,391 oz
Measured 2.65 Mt Cobalt 0.45 % 26.2 M lbs
Measured 2.65 Mt Copper 0.59 % 34.4 M lbs
Measured 2.65 Mt Gold 0.45 g/t 38,000 oz
Indicated 2.59 Mt Cobalt 0.42 % 23.8 M lbs
Indicated 2.59 Mt Copper 0.8 % 45.7 M lbs
Indicated 2.59 Mt Gold 0.62 g/t 51,000 oz
Measured & Indicated 5.24 Mt Cobalt 0.44 % 50.1 M lbs
Measured & Indicated 5.24 Mt Copper 0.69 % 80.1 M lbs
Measured & Indicated 5.24 Mt Gold 0.53 g/t 89,000 oz
Inferred 1.57 Mt Cobalt 0.35 % 12 M lbs
Inferred 1.57 Mt Copper 0.44 % 15.2 M lbs
Inferred 1.57 Mt Gold 0.45 g/t 23,000 oz

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Cobalt USD  ......  Subscription required&nbs
Cash costs (sold) Cobalt USD  ......  Subscription required&nbs
Cash costs (sold) Cobalt USD  ......  Subscription required *†
Assumed price Cobalt USD  ......  Subscription required&nbs
Assumed price Copper USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2020 study / presentation.
† Net of By-Product.

Operating Costs:

Units2020
UG mining costs ($/t milled) USD 53.7 *
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

2020 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
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 52
G&A costs $M USD 33.2
Total OpEx $M USD  ......  Subscription required
Mining Taxes $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Operating margin, %  ......  Subscription required
EBITDA (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
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment:
HME TypeSizeQuantityLeased or
Contractor
Ref. Date
Bolter ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased Nov 10, 2017
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
....................... Subscription required ....................... Subscription required Leased Jan 20, 2020
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 20, 2020
....................... Subscription required ....................... Subscription required Subscription required Jan 20, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 25, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Half-year Report 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
Fact Sheet 2018
Year-end Mineral Reserves 2018
Feasibility Study Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Jervois suspends final construction at Idaho Cobalt Operations March 29, 2023
Jervois Global Limited: Construction at Idaho Cobalt Operations Nearing Completion March 16, 2023
Jervois’ in-fill drilling at ICO adds confidence in RAM resource February 8, 2023

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