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Greenland
Citronen Project

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 Location:
921 km NE from Etah, Greenland

  Project Contacts:
Level 3 22 Railway Road
PO Box 8187 Subiaco East
Subiaco
Western Australia, Australia
6008
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  • Overview
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  • Mining
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  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit & Underground
Commodities
  • Zinc
  • Lead
Mining Method
  • Truck & Shovel / Loader
  • Room-and-pillar
Mine Life14 years (as of Jan 1, 2017)
The Citronen Zinc-Lead Project in northern- Greenland represents one of the world’s largest undeveloped zinc-lead resources with a resource in excess of 13 billion pounds of contained zinc and lead metal.


Owners

Source: p. 8, 40
CompanyInterestOwnership
Ironbark Zinc Ltd. 100 % Indirect
Ironbark A/S 100 % Direct
On 15 August 2016 the Company incorporated a new Greenland subsidiary namely ‘Ironbark A/S’. The new subsidiary is 100% wholly owned by the Company’s subsidiary “Ironbark Aust Pty Ltd’. The Company has transferred its Citronen Project and associated exploitation licence to this entity.

Contractors

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Deposit Type

  • SEDEX


Summary:

The Citronen Deposit is interpreted as belonging to the SEDEX deposit class, forming syn-depositionally with sedimentation.

SEDEX deposits are formed in submarine environments by the precipitation of sulphides from metal bearing fluids introduced onto the seafloor through underlying fractures which act as metal-bearing fluid conduits. Large amounts of sulphur are precipitated principally as pyrite and focused around vent areas or ‘mounds’ on the sea floor. Base metal (Zn + Pb) bearing sulphides at Citronen are predominantly located within laminate horizons surrounding these larger sulphide accumulations.

Mineralisation at the Citronen Fjord Zn-Pb Deposit comprises several distinct sulphide mounds containing massive and net-textured pyrite-rich mineralisation, interpreted to represent the focal point of fluid influx, flanked by pyritic laminated sulphides that are locally sphalerite and galena-rich. These laminated sulphides host the majority of economic grade mineralisation.

The deposit consists of multiple sulphide mounds forming in three lateral positions (“vents”), defined as the Discovery, Beach and Esrum ore bodies.

The mineralisation is hosted within two fine- grained sedimentary units, separated by a mass carbonate debris flow. The majority of mineralisation is stratiform, with semi-massive net-textured to massive sulphides accumulating in the core of the mound structure. Structurally controlled stock-work style minera ........


Mining Methods

  • Truck & Shovel / Loader
  • Room-and-pillar


Summary:

The ore body’s nature and orientation is well understood and the room and pillar mining method has been selected as the most appropriate for this style of deposit.

With the mining method being room and pillar, a recovery factor of 100% recovery was assumed as ore loss should be negligible provided that a tele-remote bogging system is used for the recovery of the ore drive strip material. The likelihood of ore loss would increase if a line of site remote bogging system was used.

All mining has been planned for conduction via development jumbo and, as such, minimal overbreak (i.e. unplanned dilution) outside of the planned dilution skin is expected. As a result, no tonnage factors were applied to this design.

Open pit mining operations have been scheduled to commence at the end of the life of the underground mine in Year 11 (3.3 Mtpa scenario).

The open pit mining rate to continue to maintain a total ore feed rate of 3.3 Mtpa to the process plant until the open pit is depleted. Mining will utilise 10 x 60t haul trucks and excavators until the point where the project is closed out, subject to the discovery of additional resources.


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsAvg. Annual
Zinc t 200,000

Operational Metrics:

Metrics
Annual mining capacity 3.3 Mt of ore *
Ore tonnes mined, LOM 45 Mt *
Plant annual capacity 3.3 Mt *
* According to 2017 study.

Reserves at September 14, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 7.8 Mt Zinc 5.9 % 0.5 Mt
Proven 7.8 Mt Lead 0.6 % 0.04 Mt
Proven 7.8 Mt Zinc Equivalent 6.3 % 0.5 Mt
Probable 13.5 Mt Zinc 6 % 0.8 Mt
Probable 13.5 Mt Lead 0.4 % 0.06 Mt
Probable 13.5 Mt Zinc Equivalent 6.3 % 0.8 Mt
Proven & Probable 21.3 Mt Zinc 6 % 1.3 Mt
Proven & Probable 21.3 Mt Lead 0.5 % 0.1 Mt
Proven & Probable 21.3 Mt Zinc Equivalent 6.3 % 1.3 Mt
Measured 25 Mt Zinc 5 %
Measured 25 Mt Lead 0.5 %
Indicated 26.5 Mt Zinc 5.5 %
Indicated 26.5 Mt Lead 0.5 %
Inferred 19.3 Mt Zinc 4.9 %
Inferred 19.3 Mt Lead 0.4 %
Total Resource 70.8 Mt Zinc 5.1 %
Total Resource 70.8 Mt Lead 0.5 %

Commodity Production Costs:

CommodityUnitsAverage
Site cash costs (produced) Zinc USD 0.52 / lb *†  
Assumed price Lead USD 1.05 / lb *  
Assumed price Zinc USD 1.38 / lb *  
* According to 2017 study / presentation.
† Net of By-Product.

Operating Costs:

Units2017
OP mining costs ($/t milled) USD 1.32 *
UG mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2017 study.
Subscription required - Subscription is required.

2017 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 496.5
G&A costs $M USD 344.3
Total OpEx $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net Income (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
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of September 12, 2017:
HME TypeSizeQuantity
Dozer
....................... Subscription required
....................... Subscription required
....................... Subscription required
....................... Subscription required
....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 14, 2020
....................... Subscription required ....................... Subscription required Subscription required Oct 22, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
Corporate Presentation 2018
Annual Report 2017
Feasibility Study Report 2017
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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