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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
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StatusClosing / Closed
Mine TypeOpen Pit
Commodities
  • Uranium
Mining Method
  • Truck & Shovel / Loader
Processing
  • Acid tank leaching
  • Solvent Extraction & Electrowinning
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 & OPERATOR

Source:
CompanyInterestOwnership
Rio Tinto plc 68.4 % Indirect
Energy Resources of Australia Ltd. (operator) 100 % Direct
Rio Tinto owns 68.4 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:

Ranger is a large unconformity-related deposit and the ore is mined by open cut methods. As depicted in figure 3.3, within the Ranger Project there are two orebodies—Ranger No. 1 (now mined out) and Ranger No. 3 which is currently being mined. Open cut mining at the Ranger No. 1 orebody began in August 1981 and was completed by December 1994. Production from the processing plant continued from stockpiled ore until open cut mining commenced at Ranger No. 3 orebody in October 1996.


Crushing and Grinding


Processing

  • Acid tank leaching
  • Solvent Extraction & Electrowinning

Source: Subscription required

Summary:

The mill uses a sulphuric acid leach process to dissolve uranium from the ore. Uranium is recovered from the leachate by solvent extraction and is precipitated as ammonium diuranate (yellowcake). This is then calcined (heated to more than 200°C to remove volatile components) to produce concentrates of uranium oxide (greygreen coloured powder) assaying 99.2 per cent U3O8.

Recoveries & Grades:

CommodityParameter201920182017201620152014
Uranium (U3O8) Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Uranium (U3O8) Head Grade, % 0.080.90.10.10.10.11
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Uranium (U3O8) t  ......  Subscription required  ......  Subscription required2,2942,3512,0051,165
All production numbers are expressed as U3O8.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required2.7 Mt of ore2.5 Mt of ore1.3 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:

Units201920182017201620152014
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 332.78   379.17  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -275.49   -187.8  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 25, 2019
....................... Subscription required ....................... Subscription required Subscription required Sep 25, 2019
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 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
Rio Tinto drives ERA rehabilitation of Ranger November 15, 2019
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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