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Australia
Darling Range Operation

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 Location:
28 km NE from Pinjarra, Australia

  Regional Office:
Off Del Park Road PO Box 172
Pinjarra
Western Australia, Australia
6208
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
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  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Bauxite
  • Alumina
  • Aluminum
Mining Method
  • Scraper mining
  • Truck & Shovel / Loader
Production Start...
Mine Life7 years (as of Jan 1, 2021)
Alcoa’s Australian operations represent one of the world’s largest integrated bauxite mining, alumina refining and aluminium smelting systems.
These include:
• Two bauxite mines in Western Australia (Huntly mine and Willowdale mine, which is located 70Km SE from Huntly);
• Three alumina refineries in Western Australia (Kwinana, Pinjarra and Wagerup);
• One aluminium smelter in Victoria (Portland);
• Two dedicated port facilities in Western Australia (Kwinana and Bunbury).

The Huntly and Willowdale operations collectively represent one of the world’s largest bauxite mines.


Owners

Source: p. 214
CompanyInterestOwnership
Alumina Ltd. 40 % Indirect
Alcoa Corp. 60 % Indirect
Alcoa World Alumina and Chemicals (AWAC) (operator) 100 % Direct
The mining rights and assets involved with bauxite mining and alumina refining in Australia are 100% owned by Alcoa of Australia Limited (AofA), an affiliate of Alcoa owned by Alcoa World Alumina and Chemicals (AWAC). AWAC is an unincorporated global joint venture between Alcoa and Alumina Limited. Alcoa Corporation owns 60% and Alumina Limited owns 40% of these entities, directly or indirectly, with such entities being consolidated by Alcoa Corporation for financial reporting purposes.

Contractors

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Deposit Type

  • Bauxite


Summary:

The DarlingRange comprises a low incised plateau formed by uplift along the north-south trending Darling Fault, which is a major structural lineament that separates the Pinjarra Orogen tothe west, from the Yilgarn Craton to the east. The range extends for over 250 km, from Bindoon in the north to Collie in the south.

Bauxite deposits have been identified throughout the Darling Range and generally occur as erratically distributed alumina-rich lenses within the eroded laterites that mantle thegranites to the east of the scarp line. The bauxites are thought to have formed from the lateritization of the peneplained surface of the Western Gneiss Terrane rocks.Lateritization is thought to have commenced during the Cretaceous and continued through to the Eocene, with the subsequent periodic activity of the Darling Fault resulting inthe current landform of scarps and deeply incised valleys on the western edge of the Darling Range.

Laterite remnants are thickest and most extensive over a 150 km long region between the Avon and Harris Rivers, and within about 50 km of the Darling Scarp. The lateriteoccupies gently sloping (3o to horizontal) upland areas with an average elevation of 280 to 300 meters above sea level (MASL), and high annual rainfall. Steeper slopes may have athin cover of partly transported laterite with bedrock near the surface. Above 340 m the laterite is penetrated by bedrock which rises above the general topographic level. Below200 m drainage ha ........


Mining Methods

  • Scraper mining
  • Truck & Shovel / Loader


Summary:

The Huntly and Willowdale mines employ conventional open pit mining practices and equipment. The fleet is mixed between contract and owner-operator, depending on the nature of the task at hand. Owner operator equipment is used for mining the bulk of the Mineral Reserve, operating in areas away from those subject to environmental restrictions. Contract mining operates smaller equipment, day shift only, in environmentally (noise) sensitive areas and at the perimeter of the mining area.Following definition of Mineral Reserve blocks, vegetation is cleared ahead of mining by the Western Australian State Forest Products Commission (FPC), saleable timber being harvested for use. On receipt of clearance to proceed from the FPC, Alcoa operations commence stripping topsoil and secondary overburden removal (SOBR) using small excavators, scrapers, and trucks. Soil is stockpiled at the site, away from the proposed pit, for rehabilitation purposes.

Mining progresses on 4 m benches, utilizing a contour-mining sequence, cutting benches across the topography, working from top to bottom, maintaining the flattest floor obtainable to a maximum gradient of 1:10. This is most pronounced in steep areas. Most of the mineralization lies beneath a gently undulating topography and contour mining is minimal.

After completion of mining, overburden is progressively backfilled into adjacent exhausted pits, topsoiled and rehabilitated by re-establishment of native vegetation, creating ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits202120202019201820172016
Bauxite M dmt  ......  Subscription required  ......  Subscription required  ......  Subscription required343332
All production numbers are expressed as ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Annual production capacity  ......  Subscription required  ......  Subscription required8,979 kt of alumina powder8,979 kt of alumina powder8,979 kt of alumina powder8,979 kt of alumina powder
Annual production capacity  ......  Subscription required  ......  Subscription required358 kt of aluminum metal358 kt of aluminum metal358 kt of aluminum metal358 kt of aluminum metal
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Resources are estimated at a geological cut-off grade, which generally approximates to nominal cut-off grades of 27.5% A.Al2O3 with less than 3.5% R.SiO2.

CategoryTonnage CommodityGrade
Proven 108.6 Mt Al2O3 32.4 %
Probable 132.7 Mt Al2O3 32.2 %
Proven & Probable 241.3 Mt Al2O3 32.3 %
Measured 27.1 Mt Al2O3 33 %
Indicated 23.8 Mt Al2O3 31.6 %
Inferred 179 Mt Al2O3 32 %


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantity
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required 250 t ....................... Subscription required
Loader ....................... Subscription required 150 t ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required 220 t ....................... Subscription required
Scraper ....................... Subscription required ....................... Subscription required
Scraper ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required 190 t ....................... Subscription required
Truck (haul) ....................... Subscription required 190 t ....................... Subscription required
Truck (haul) ....................... Subscription required 190 t ....................... Subscription required
Truck (haul) ....................... Subscription required 150 t ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 16, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Annual Report 2016
Environmental Impact Statement 2005
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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