South Africa

Cooke Mine

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Categories

Overview

Mine TypeTailings
StatusActive
Commodities
  • Gold
  • Uranium
Mining Method
  • Hydraulic mining
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life... Lock
SnapshotThe Cooke operation was previously a large underground mining complex, consisting of four vertical production shafts, but the final underground workings were placed on care and maintenance during 2017. Current operations comprise the Randfontein surface operation (RSO), which mines and re-treats historic tailings through the Cooke gold plant. In addition,the Ezulwini gold plant is used as a toll treatment facility, catering to both external and internal operations.

The Millsite TSF complex, which is currently being exploited, potentially supporting a 20y LoM.

The Cooke uranium Mineral Resources are contained within two historic TSFs situated on the Cooke mineral rights. These surface uranium Mineral Resources represent a key strategic opportunity due to the proximity of the existing Cooke (gold only) and Ezulwini (gold and uranium) processing plants. Various development options are currently being traded off to establish the optimum path to production from these assets.

Owners

SourceSource
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 76 % Indirect
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.

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 connected to the old underground workings of the Randfontein Estates operation as part of an approved EMPR. An estimated 11.1Mt of depositional capacity is available in these pits assuming no further storage capacity in the connected underground workings. To date however, there is no indication that the tailings are beginning to beach and the material is still filling the underground voids.

A total of 4.0Mt of depositional capacity is still available at the Cooke 4 (Ezulwini) TSF complex.

There is sufficient capacity for depositing the three-year LoM residue tailings material.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Production

CommodityUnits202320222021202020192018201720162015
Gold koz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe4245100182201
All production numbers are expressed as metal in doré.

Operational metrics

Metrics202320222021202020192018201720162015
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe4,328 kt4,092 kt3,722 kt5,201 kt5,793 kt

Production Costs

CommodityUnits2023202220212020201920182017
Total cash costs (sold) Gold USD 1,472 / oz  
All-in sustaining costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,120 / oz **   1,118 / oz **   1,574 / oz **  
All-in costs Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,120 / oz **   1,118 / oz **   1,583 / oz **  
** Net of By-Product.

Operating Costs

Currency20232022202120202016
Total operating costs ($/t milled) ZAR 294  210  174  155  575  

Financials

Units2023202220212020201920182017
Sustaining costs M ZAR 8.5  
Capital expenditures M ZAR 73.9  
Revenue M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 828.4   841.8   1,677  
Gross profit M ZAR -284  
Operating Income M ZAR
Pre-tax Income M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe
After-tax Income M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe -531.4   -627.3   -4,602  
EBITDA M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe -357.5  

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 7, 2024
....................... Subscription required ....................... Subscription required Subscription required May 7, 2024

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2023
...... Subscription required ...... Subscription required ...... Subscription required 2022
...... 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

Aerial view:

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