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Australia
Weipa Operation (Amrun Mine)

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 Location:
79 km N from Aurukun, Queensland, Australia

  Address:
Lorim Point
Weipa
Queensland, Australia
4874
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  • Overview
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  • Mining
  • Processing
  • Production
  • Reserves
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Bauxite
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life40 years (as of Jan 1, 2018)
Weipa operations includes three bauxite mines (East Weipa mine, Andoom mine and Amrun mine), processing facilities, shiploaders, an export wharf, two ports, power stations, a rail network and ferry terminals.


Owners

Source: p. 240,330
CompanyInterestOwnership
Rio Tinto plc 100 % Indirect
Rio Tinto owns and operates the Weipa bauxite mine located on Western Cape York Peninsula.

Contractors

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Deposit Type

  • Bauxite
  • Sedimentary


Summary:

The rocks of the Cape York Peninsula are divided into two geological units: the sedimentary rocks on the western side of the peninsula and the igneous and metamorphic rocks exposed in the hills on the eastern side of the peninsula (the Coen Inlier).

The Cape York Peninsula bauxites are confined to a dissected laterite plateau, known officially as the Weipa Plateau on the west coast of Cape York Peninsula. The Weipa Plateau is one of three geomorphologic land units that are of particular interest to the geology of the bauxite and kaolin resources. The other two units are the Merluna Plain and the Mapoon Plain.
• The Weipa Plateau is a low plateau, usually no more than a few tens of metres above sea level and has been dissected by various river systems resulting in a series of irregularly shaped islands. It is intensely weathered to a depth of 20 m to 30 m with the upper part of the weathered material reconstituted into various nodules as well as some partially cemented rocks. The flatness of the plateau has meant it has been immune to erosion other than by rivers eating away at the sides. Much of the plateau’s volume was removed in solution in the groundwater, which is also responsible for the formation of the bauxite. The sedimentary rocks of the Weipa Plateau fall into two categories:
- The Rolling Downs Group Sediments; and
- The Bulimba Formation Sediments (Weipa Beds).

• These two groups of sediments are eroded and weathered to form th ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Weipa operations includes three bauxite mines East Weipa, Andoom and Amrun.

Bauxite ore in Weipa is found in a layer three to four metres deep in the form of small, red pebbles, called pisolites.

Vegetation is removed from the site to be mined and scrapers strip the topsoil (which varies in depth from one to ten metres). Front-end loaders use a shallow, opencut technique to load the bauxite, which lies below the topsoil, into bottom-dump trucks that carry the ore to the dump station. The bauxite is then transported to the beneficiation plant by rail or conveyor.

• As the Weipa orebodies are shallow, geotechnical risks are extremely low. Pre-production drilling is completed in order to provide better definition of the roof and floor contacts for the five-year mine planning process.
• Estimates include internal dilutional but no allowance for external dilution or mining recovery. Dilution and mining recovery are applied during the reserving process, not during estimation.
• A minimum mining thickness for the bauxite horizon of 0.5 m is used for the final determination of resource figures.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Bauxite kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required30,43730,89829,427
All production numbers are expressed as ore.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20222021
Annual production capacity  ......  Subscription required  ......  Subscription required
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Reserves at December 31, 2022:
Bauxite Ore Reserves are stated as recoverable Ore Reserves of marketable product after accounting for all mining and processing losses.

CategoryTonnage CommodityGradeRecoverable Metal
Proven Mt Bauxite 300 Mt
Proven Mt Al2O3 53.7 %
Probable Mt Bauxite 560.5 Mt
Probable Mt Al2O3 54.8 %
Proven & Probable Mt Bauxite 860 Mt
Proven & Probable Mt Al2O3 54.5 %
Measured 155 Mt Bauxite
Measured Mt Al2O3 49.3 %
Indicated 417 Mt Bauxite
Indicated Mt Al2O3 49.9 %
Measured & Indicated 572 Mt Bauxite
Measured & Indicated Mt Al2O3 49.7 %
Inferred 1,655 Mt Bauxite
Inferred Mt Al2O3 52 %
Total Resource 2,227 Mt Bauxite
Total Resource Mt Al2O3 51.4 %



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 8, 2023
....................... Subscription required ....................... Subscription required Subscription required Mar 8, 2023
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Sustainability Report 2017
Annual Report 2016
Annual Report 2015
Other 2015
Technical Report 2012
Other 2005
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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