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Australia
Koolan Island Mine

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 Location:
140 km N from Derby, Western Australia, Australia

  Regional Office:
Level 1, 2 Kings Park Rd
West Perth
Western Australia, Australia
6005
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Fax+61-8-9485-2305
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Iron (hematite)
Mining Method
  • Truck & Shovel / Loader
Processing
  • Crush & Screen plant
Mine Life5 years (as of Jan 1, 2021)
Operational milestones during the year included substantial progress toward completion of the bulk stripping program at Koolan Island.

Complete the processing plant upgrade and the Main Pit waste stripping and footwall support programs to regain access to high grade ore.
Latest NewsMount Gibson restart at Koolan Island makes the grade     July 15, 2019


Owners

Source: p. 11,18,23
CompanyInterestOwnership
Mount Gibson Iron Ltd. 100 % Indirect
Ownership Tree
Total Koolan Island Mineral Resources and Ore Reserves comprising the Main, Acacia East and Mangrove Deposits.

Main Mineral Resource is located on Mining Lease M04/417-I held by Koolan Iron Ore Pty Ltd, a 100% owned subsidiary of MGX.

Acacia East Mineral Resource is located on Mining Lease M04/416-I held by Koolan Iron Ore Pty Ltd, a 100% owned subsidiary of Mount Gibson Iron Ltd.

The Mangrove Mineral Resource is located on Mining Lease M04/417-I held by Koolan Iron Ore Pty Ltd, a 100% owned subsidiary of Mount Gibson Iron Ltd.

Deposit Type

  • Sandstone hosted


Summary:

Total Koolan Island Mineral Resources and Ore Reserves comprising the Main, Acacia East and Mangrove Deposits.

Koolan Island, Main Deposit
The mineralised zone is an overturned enriched haematitic sandstone horizon within the Yampi Sandstone Member unconformably overlying the Elgee Siltstone. It is between 12 and 30 metres thick, and dips 55 to 80 to the south.

The Main deposit mineralisation is approximately 2,000 m in length and is currently modelled to approximately 215 m in depth below mean sea level. Mineralisation continues and extends beyond this depth however further infill drilling is required to define this area with confidence. The resource is open at depth.

Koolan Island, Acacia East Deposit
The mineralised zone is an enriched haematitic sandstone horizon within the Yampi Sandstone member unconformably overlying the Elgee Siltstone. It is between 8 and 20 metres thick, and dips 45 to 60 to the south.

The Acacia East mineralisation is approximately 1,500m in length and is modelled to approximately 300 m in depth.

Koolan Island, Mangrove Deposit
The mineralised zone is an enriched haematitic sandstone horizon within the Yampi Sandstone Member unconformably overlying the Elgee Siltstone. It is between 12 and 30 metres thick. The mineralised unit is overturned and dips from 80 to the south in the west, twisting to right way up and 80 to the North in the east.

The Mangrove mineralisation is approximately 1,000m in length and is modelled to approximately 250 m in depth.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Koolan Island, Main DepositThe deposit has been mined by conventional open pit mining methods, utilising industry standard practices of drilling, blasting, and load and haul using hydraulic backhoe excavators. The overburden waste has been removed by large size excavators with bulk mining method. Where required medium size excavators have been used for selective mining of ore. Known mining parameters from Main pit were used in the optimisation and pit design.

Modelling of mining dilution in three dimensions is by the digital application of a dilution skin around the ore in the Mineral Resource model. Metallurgical parameters are then added to the diluted model. The final diluted mining block model is used directly for pit optimisation and scheduling, without the further application of global factors.

Mine infrastructure is well established following 9 years of mining operations. The physical width and therefore depth of Main Pit is constrained by the final hanging wall pit limit relative to the position of the seawall.


Crushing and Grinding


Processing

  • Crush & Screen plant

Source: Subscription required

Summary:

Ore from the Main deposit is crushed and screened at the existing Koolan Island process plant.

An upgrade of the ore crushing plant is being undertaken to ensure it can safely and cost-effectively handle the substantial increase in ore production expected over the remaining mine life.

The project is being undertaken via two stages:
1. Reconfiguration of lump and fines conveyors and stacker systems.
2. Construction of a new ROM wall, installation of new jaw and cone crushers, and upgrade of screening capacity.

Work staged to minimise disruption to crushing and ship-loading.

Stage 1 already completed with Stage 2 currently targeted for completion in the December 2021 quarter.

Recoveries & Grades:

CommodityParameter20212020
Iron (hematite) Head Grade, %  ......  Subscription required  ......  Subscription required

Production:
Koolan Island is the highest grade direct shipping iron ore operation in Australia.

CommodityUnits20222021202020192016
Iron (hematite) kwmt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required1,286
All production numbers are expressed as lump & fines. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2021202020192016
Total tonnes mined  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required552 kwmt1,381 kwmt
Waste  ......  Subscription required  ......  Subscription required10,185 kwmt3,322 kwmt
Subscription required - Subscription is required.

Reserves at June 30, 2021:
Mineral Reserves and Resources are reported at a cut-off grade of 50% Fe.

CategoryTonnage CommodityGrade
Probable 17.5 Mt Iron 65.3 %
Measured 2.9 Mt Iron 60.2 %
Indicated 32.5 Mt Iron 64.2 %
Inferred 9.9 Mt Iron 60.5 %
Total Resource 46.2 Mt Iron 63.7 %

Commodity Production Costs:

CommodityUnits20212020
Cash costs (sold) Iron (hematite) AUD  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units202220212020201920162015
Capital expenditures (planned) M AUD  ......  Subscription required
Revenue M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required 60   111.3  
EBIT M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M AUD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 20, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Annual Report 2016
Subscription required - Subscription is required.

News:

NewsDate
Mount Gibson restart at Koolan Island makes the grade July 15, 2019
Mount Gibson restarts Koolan Island shipments to China April 24, 2019
Koolan Island restart on track for Mount Gibson December 13, 2018
Mount Gibson positive ahead of Koolan Island restart August 15, 2018

Aerial view:

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