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South Africa
Cooke Mine

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 Location:
8 km NE from Westonaria, South Africa

  Regional Office:
Constantia Office Park Cnr 14th Avenue & Hendrik Potgieter Road Bridgeview House Ground floor
Weltevreden Park
South Africa
1709
Phone  ...  Subscription required
Fax+27-11-278-9863
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeTailings
Commodities
  • Gold
  • Uranium
Mining Method
  • Truck & Shovel / Loader
  • Hydraulic mining
Production Start...
Mine Life2025
The underground operations have been placed on care and maintenance with one of two gold processing plants (one with an integrated uranium recovery circuit) still active.

The underground workings were placed on care and maintenance (C&M) during 2017. Current operations comprise the Cooke plant and the Randfontein Surface Operation (RSO), an active tailings mining and retreatment operation. In addition, the Ezulwini gold plant (at No. 4 Shaft) is used as a toll treating facility, catering to both external and internal operations.

The Cooke underground operations have been earmarked for legal closure and rewatering, and various cost-saving initiatives have been implemented to reduce C&M costs, mostly relating to the pumping of water.


Owners

Source: p. 59,60
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 76 % Indirect
Rand Uranium Pty Ltd. (operator) 100 % Direct
Ezulwini Mining Company (Pty) Ltd. (operator) 100 % Direct
Ownership Tree
Rand Uranium Proprietary Limited and Ezulwini Mining Company Proprietary Limited together own a number of underground and surface mining operations. These operations report to the Group’s chief operating decision maker as a separate segment, namely Cooke.

Contractors

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Deposit Type

  • Tailings


Summary:

The mineral assets are historical gold plant tailings material from the mining of auriferous and uraniferous ore from the goldbearing, late Archaean (2.7Ga to 3.2Ga), Witwatersrand Basin in the West Rand Goldfield. The typical composition is quartz (70% to 80%), mica (10%), chlorite and chloritoid (9% to 18%) and pyrite (1% to 2%). Gold, uranium oxide, zirconium and chromium are minor constituents.

The composition of a TSF depends on the geochemical make-up of the material being mined and the chemicals used in the mining and extraction process. Further, the internal structure of the TSF reflects the mining strategy and depositional methodologies employed for each operation. The bulk density of tailings material and the lateral and vertical variation in moisture content is a critical factor in the accurate estimation of tonnages. In addition, secondary processes such as metal remobilisation, erosion, weathering, leaching and acid mine drainage can affect the geochemical characteristics of a TSF. Gold can undergo mobilisation within the TSF over time, and hence, may exhibit areas of reconcentration, and even be present in the sub-structure (footprint) soil. These factors can result in a considerable variation in gold content and distribution throughout the TSF and such variation has an impact on final recoveries and projected revenues for the operation.

Tailings from Cooke plant (RSO) are deposited into historic, dormant, unrehabilitated opencasts connecte ........


Mining Methods

  • Truck & Shovel / Loader
  • Hydraulic mining


Summary:

Cooke is a large, established, shallow to intermediate-level gold mine which has been producing gold and uranium since 1961. Cooke underground operations are on care and maintenance.

Cooke has four vertical shaft complexes (including one with a sub-shaft) and two mineral processing plants.

All four shafts are currently only used for dewatering.

Mining methods:
• Mining of the TSF is via hydro (waterjet) methods;
• Mining of SRD with LHD trucks.

The surface mining is located in the West Rand District Municipality of the Gauteng province, South Africa. Cooke shafts are located approximately 30km to 40km south-west of Johannesburg. The sites are accessed via the R28 highway between Randfontein and Westonaria or via the N12 national road between Johannesburg and Potchefstroom. The Randfontein Surface Operations (RSO) assets include several TSFs on the West Rand near Randfontein.

The underground mine infrastructure, which is on care and maintenance, consists of four shaft complexes that previously mined open ground and pillars (white areas). Cooke 4, previously operated at 1,634m below surface (58 Level at Cooke 4 SV Shaft) and was declared uneconomical for exploitation from August 2016. Cooke 1, 2 and 3 Shafts have also since been declared non-economical for exploitation. The decision was made to close the underground workings. The principal mining took place on the Middle and Upper Elsburg Reefs. The remainder ........


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits202120202019201820172016
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required45100182
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required4,328 kt4,092 kt3,722 kt5,201 kt
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Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityGradeContained 
Commodity
Probable Tailings 12.5 Mt Gold 0.3 g/t 0.1 M oz
Proven & Probable Tailings 12.5 Mt Gold 0.3 g/t 0.1 M oz
Measured Tailings 205.3 Mt Gold 0.3 g/t 1.7 M oz
Measured Tailings 205.3 Mt Uranium (U3O8) 100 g/t 41.4 M lbs
Indicated Tailings 52.2 Mt Gold 0.3 g/t 0.5 koz
Indicated Tailings 52.2 Mt Uranium (U3O8) 100 g/t 9.9 M lbs
Measured & Indicated Tailings 257.5 Mt Gold 0.3 g/t 2.2 M oz
Measured & Indicated Tailings 257.5 Mt Uranium (U3O8) 100 g/t 51.3 M lbs

Commodity Production Costs:

CommodityUnits202120202019201820172016
Total cash costs (sold) Gold USD 1,472 / oz   1,119 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,118 / oz†   1,574 / oz†   1,248 / oz†  
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,118 / oz†   1,583 / oz†   1,263 / oz†  
† Net of By-Product.
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Operating Costs:

Units20162015
Total operating costs ($/t milled) ZAR 575514

Financials:

Units202120202019201820172016
Sustaining costs M ZAR 8.5   48.9  
Capital expenditures M ZAR 73.9   249.2  
Revenue M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required 841.8   1,677   3,362  
Gross profit M ZAR -284   377.2  
Operating Income M ZAR -393.6  
After-tax Income M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required -627.3   -4,602   -1,957  
EBITDA M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015

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
Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Financial Review 2016
Form 20-F 2016
Year-end Mineral Reserves 2016
Form 20-F 2015
Year-end Mineral Reserves 2015
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