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Australia
Ranger Mine

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 Location:
8 km E from Jabiru, Northern Territory, Australia

  Address:
Level 3, Energy House 18-20 Cavenagh Street
Darwin
Northern Territory, Australia
0801
Phone  ...  Subscription required
Fax+61 (0) 8 8924 3555
EmailEmail
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StageReclamation
Mine TypeOpen Pit
Commodities
  • Uranium
Mining Method
  • Truck & Shovel / Loader
Processing
  • Crush & Screen plant
  • Wash plant
  • Concentrate leach
  • Acid tank leaching
Mine Life2021
Under the current legal framework, ERA is required to cease mining and processing activities in the Ranger Project Area by 8 January 2021, with final rehabilitation to be completed by 8 January 2026.
Latest NewsEnergy Resources of Australia Ltd.: End of ERA at Ranger mine     January 8, 2021


Owners

Source:
CompanyInterestOwnership
Rio Tinto plc 86.3 % Indirect
Energy Resources of Australia Ltd. (operator) 100 % Direct
Rio Tinto owns 86.3 per cent of ERA shares. The balance of the company’s shares are publicly held and traded on the Australian Securities Exchange.

Deposit Type

  • Sedimentary


Summary:

The Ranger No. 1 and No. 3 orebodies contain about 124,000 tonnes l^Og in highly chloritized metasediments of the lower Proterozoic Cahill Formation within about 500 m of the projected sub-Kombolgie Formation unconformity. In both orebodies, oxidized and reduced uranium minerals occur chiefly in quartzose schists that have highly variable amounts of muscovite, sericite, and chlorite.

Below the oxidized zone, uranium occurs chiefly as uraninite and pitchblende disseminated through thick sections of quartz-chlorite-muscovite schist and has no apparent association with graphite or sulfides. In fact, graphite is rare and sulfides are generally low in abundance (<0.5 percent). Higher ore grades occur in disrupted zones a few centimeters thick and in some quartz chlorite vein-like zones of uncertain origin. Uranium correlates strongly with chlorite, but not all of the many ages of chlorite have associated uranium. At least five textural varieties of chlorite are present and represent at least 3 ages. Preliminary microprobe analyses suggest that Mg-Fe-Al contents are relatively uniform. Apatite commonly occurs with chlorite. Uranium is not common in carbonate rocks and seems to occur only in disrupted zones that have chlorite alteration.

The structure of the orebodies is outwardly simple, particularly in No. 3; dips are less than 40° on most lithologic contacts. The No. 1 orebody is in a basin-like structure about 400 m wide that probably formed in part by progressive removal of carbonate rocks that are as much as 200 m thick adjacent to the No. 1 orebody and below the No. 3 orebody. Quartz-chlorite breccias have formed in the zone of carbonate thinning; uranium is spotty and low grade in these breccias. Chloritized and uraniferous broken and sheared zones, a few centimeters to a few meters thick, have an unknown attitude but must have small displacement. Blocks of altered Kombolgie sandstone are downfaulted into the No. 3 orebody and locally contain reduced uranium minerals. One or more shear zones 5-30 m thick.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at Ranger involved a conventional open cut process, which begins with drilling and blasting. Pit 1 was mined out in 1994 and mining in Pit 3 ceased in November 2012. Prior to the completion of mining in the pits, mined material was categorised by a discriminator, which measured the gamma emissions of each load to calculate uranium grade for either stockpiling or immediate processing according to the grade of the ore (percent uranium oxide). Low-grade ore will be returned as backfill to the mined-out pits and covered by unmineralised rock to create the final landform.


Crushing and Grinding


Processing

  • Crush & Screen plant
  • Wash plant
  • Concentrate leach
  • Acid tank leaching

Source: Subscription required

Summary:

The major ore processing stages are described below:
• Uranium ore is crushed and ground, then the fine ore is then mixed with water to
produce a slurry.
• The ore slurry is pumped to leaching vessels where, over a period of 24 hours, more
than 90 percent of the uranium in the ore is dissolved using sulfuric acid and pyrulosite
(an oxidant).
• The uranium in solution is then separated from the depleted ore in a seven stage
washing circuit.
• After separation, the acidity of the depleted ore (tailings) is partially neutralised with
lime before being pumped to the tailings dam, while the leach solution is clarified and
filtered.
• The uranium is extracted from the leach solution and concentrated, then pumped to
precipitation tanks.
• A bright yellow uranium compound (ammonium diuranate), commonly referred to as
'yellowcake' is precipitated using ammonia.
• In the final stage of the process, the yellowcake is heate ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Uranium (U3O8) Recovery Rate, %  ......  Subscription required  ......  Subscription required86.684.784.98281.5
Uranium (U3O8) Head Grade, %  ......  Subscription required  ......  Subscription required0.90.10.10.10.11

Production:

CommodityUnits2020201920182017201620152014
Uranium (U3O8) t  ......  Subscription required  ......  Subscription required1,9992,2942,3512,0051,165
All production numbers are expressed as U3O8.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required2.5 Mt of ore2.5 Mt of ore2.6 Mt of ore2.7 Mt of ore2.5 Mt of ore
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeContained 
Commodity
Proven & Probable Stockpiles 2.42 Mt Uranium (U3O8) 0.071 % 1,711 t
Measured & Indicated Stockpiles 41.29 Mt Uranium (U3O8) 0.11 % 43,614 t
Inferred Stockpiles 5.44 Mt Uranium (U3O8) 0.2 % 11,087 t

Financials:

Units202020192018201720162015
Revenue M USD  ......  Subscription required  ......  Subscription required201.3   211.2   267.8   332.8  
After-tax Income M USD  ......  Subscription required  ......  Subscription required-435.3   -43.5   -271.1   -275.5  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Feb 24, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2020
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Annual Report 2018
Sustainability Report 2018
Annual Report 2017
Annual Report 2017
Annual Report 2016
Annual Report 2015
Other 1982
Subscription required - Subscription is required.

News:

NewsDate
Energy Resources of Australia Ltd.: End of ERA at Ranger mine January 8, 2021
ERA advances Ranger rehabilitation October 5, 2020
ERA on track to meet 2020 production guidance April 8, 2020
ERA confirms Ranger rehabilitation by 2026 October 2, 2019
The end nears for Ranger uranium mine January 11, 2019

Aerial view:

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