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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
Processing
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Cyanide (reagent)
Mine Life3 years (as of Jan 1, 2020)
The underground workings were placed on care and maintenance during the 2017 reporting period. Current operations are centred around the Cooke Plant and the Randfontein Surface Operation (RSO), which comprise an active tailings mining and retreatment operation. In addition, the Ezulwini gold plant 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. Legal challenges to the official closure and rewatering application to the DMRE, by amongst others, Gold Fields, who operates the South Deep Mine, adjacent to Cooke 4 Shaft, is currently delaying the closure process.


Owners

Source: p. 58
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 100 % 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.

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.


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 of the mining took place on the secondary reefs, namely the Kimberly Formations and the VCR. The only production currently is from surface TSF. The production from the four Cooke shafts could be hoisted to surface separately. Underground material from Cooke 1,2 and 3 was previously processed at the Doornkop plant, operated by Harmony Gold Mining Company Ltd (Harmony), on a toll treatment basis. Cooke 4 production and overflow from the Cooke 3 Shaft was treated at Ezulwini along with ore from SRDs on a toll treatment basis.


Crushing and Grinding


Processing

  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Cooke plant treats TSF material from the RSO and is toll treating some minor quantities of SRD material from third parties.

Ezulwini plant is toll treating SRD material from third parties and the Kloof operation.

The Ezulwini plant has an integrated uranium extraction circuit which has been used in the past to extract uranium from Middle Elsburg ore, but which is currently dormant.


Production:
From 17 April 2020, management commenced implementing its strategy to mobilise the required employee complement to safely ramp up production at our South African operations to the initial restricted 50%. At 30 June 2020 the SA Gold and SA PGM operations were at a production capacity of 86% and 73%, respectively.

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required  ......  Subscription required45100182201
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required4,328 kt4,092 kt3,722 kt5,201 kt5,793 kt
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryOreTypeTonnage CommodityGradeContained 
Commodity
Probable Stockpiles 11.1 Mt Gold 0.3 g/t 0.098 M oz
Measured Tailings 210 Mt Gold 0.3 g/t 1.721 M oz
Measured Tailings 210 Mt Uranium (U3O8) 100 g/t 41.8 M lbs
Indicated Stockpiles 11.1 Mt Gold 0.3 g/t 0.098 M oz
Indicated Tailings 52.3 Mt Gold 0.3 g/t 0.524 M oz
Indicated Tailings 52.3 Mt Uranium (U3O8) 100 g/t 9.9 M lbs
Total Resource Total 273.4 Mt Gold 0.3 g/t 2.343 M oz
Total Resource Tailings 262.3 Mt Uranium (U3O8) 100 g/t 51.7 M lbs

Commodity Production Costs:

CommodityUnits202020192018201720162015
Total cash costs (sold) Gold USD 1,472 / oz 1,119 / oz 1,158 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 1,118 / oz† 1,574 / oz† 1,248 / oz† 1,322 / oz†
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required† 1,118 / oz† 1,583 / oz† 1,263 / oz† 1,329 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

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

Financials:

Units202020192018201720162015
Sustaining costs M ZAR 8.5   48.9   92.9  
Capital expenditures M ZAR 73.9   249.2   337.4  
Revenue M ZAR  ......  Subscription required  ......  Subscription required841.8   1,677   3,362   2,975  
Gross profit M ZAR -284   377.2   -3.5  
Operating Income M ZAR -393.6   -708.1  
After-tax Income M ZAR  ......  Subscription required  ......  Subscription required-627.3   -4,602   -1,957   -698.9  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 8, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
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 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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Aerial view:

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