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South Africa
South Deep Mine

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 Location:
43 km SW from Johannesburg, South Africa

  Address:
Old Vereeniging Road Farm Modderfontein
Westonaria
South Africa
1780
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Fax+27-11-411-1521
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • High profile de-stress
  • Drift & Benching
  • Longhole stoping
  • Paste backfill
  • Hydraulic mining
Production Start...
Mine Life2101
The mine has been built to extract one of the largest known gold deposits in the world and boasts a mineral reserve of 32,8 million ounces.


Owners

Source: p. 373
CompanyInterestOwnership
BEE 10 % Indirect
Gold Fields Ltd. 90 % Indirect
South Deep Joint Venture (operator) 100 % Direct
The South Deep Joint Venture (“SDJV”) owns and operates the South Deep Gold Mine. The SDJV is an unincorporated joint venture between Gold Fields Operations Limited (“GFO”) and GFI Joint Venture Holdings Proprietary Limited (“GFIJVH”). GFO and GFIJVH are wholly owned subsidiaries of Newshelf 899 Proprietary Limited (“Newshelf”). The share capital of Newshelf comprises of:
- 90 000 000 “A” shares, representing 90% of Newshelf’s equity. Gold Fields Limited is the holder of the “A” shares; and
- 10 000 000 “B” shares, representing 10% of Newshelf’s equity. South Deep’s BEE shareholders are the holders of the “B” shares.

Contractors

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Deposit Type

  • Conglomerate hosted


Summary:

South Deep is a deep-level underground gold mine located along the northern and western margins of the Witwatersrand Basin, which has been the primary contributor to South Africa’s production and a significant portion of the world’s recorded gold output since 1886. Gold mineralisation at South Deep is hosted by conglomerates of the Upper Elsburg reefs and the Ventersdorp Contact Reef (VCR). The Upper Elsburg reefs sub-crop against the VCR in a north-easterly trend, which defines their western limits. To the east of the sub-crop, the Upper Elsburg reefs are preserved in an easterly diverging sedimentary wedge attaining a total thickness of approximately 120 metres, which is subdivided into the lower “Individuals” and the overlying “Massives” to the west of the sub-crop, only the VCR is preserved. The stratigraphic units at South Deep generally dip southward at approximately 12 to 15 degrees and the gold-bearing reefs occur at depths of 1,500 metres to 3,500 metres below surface. In general, the gold mineralisation hosted by the conglomerates is laterally continuous with long range predictability and clear patterns of predictable mineralisation governed by sedimentary characteristics. Production at South Deep is currently derived from the Upper Elsburg Reefs. In general terms, the Upper Elsburg succession represents an easterly prograding sedimentary sequence, with the Massives containing higher gold grades and showing more proximal sedimentological attributes in the eastern ........


Mining Methods

  • High profile de-stress
  • Drift & Benching
  • Longhole stoping
  • Paste backfill
  • Hydraulic mining


Summary:

South Deep is an underground mechanised mine, using an owner mining workforce. Reserves are accessed through de-stress and shadow development cuts to manage rock stress and seismic activity. A number of selective mining methods, including drifts and benches, are employed but long-hole stoping with paste fill is the primary bulk mining method. Significant focus is on frontline coaching to improve compliance to plan and productivity. Mining method and extraction sequence optimisation is ongoing. The workings are accessed from the surface through two shaft systems, the Twin Shaft complex (main and ventilation shafts), of which the main shaft comprises a single-drop to 110A level, a depth of 2,998m, the vent shaft to 110 level at a depth of 2,947m and the South Shaft complex, which is a subvertical system (three operating shafts) to 95 level at a depth of 2,786m. The mine is divided into three main areas: 1. Current Mine (CM), characterised by selective mining methods scattered over a large area originally exploited by means of conventional tabular mining. CM is accessed from four active levels (90, 93 and 95) from both the South Shaft and Twin Shaft complexes. 2. The North of Wrench (NoW), directly south and down dip of CM, comprises six mining corridors separated by regional pillars that extend southwards to the Wrench fault. A bulk non-selective mining method is applied, resulting in a higher Resources to Reserves conversion ratio. 3. The South of Wrench (SoW) east and ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold kg  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required5,2208,7489,032
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined  ......  Subscription required  ......  Subscription required1,138 kt1,036 kt1,610 kt1,722 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,060 kt835 kt1,421 kt1,611 kt
Waste  ......  Subscription required  ......  Subscription required77 kt200 kt189 kt111 kt
Tonnes processed  ......  Subscription required  ......  Subscription required1,666 kt1,320 kt2,081 kt2,249 kt
Annual processing capacity  ......  Subscription required  ......  Subscription required4 Mt4 Mt4 Mt4 Mt
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Reserves at December 31, 2021:
Underground Mineral Resources cut-off grade: 3.4 – 6.0 g/t
Underground Mineral Reserves cut-off grade: 4.0 – 4.4 g/t

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Total 15,533 kt Gold 5.4 g/t 2,699 koz
Probable Total 186,004 kt Gold 4.93 g/t 29,489 koz
Proven & Probable Total 201,537 kt Gold 4.97 g/t 32,188 koz
Measured Tailings 49,535 kt Gold 0.23 g/t 361 koz
Measured In-Situ (UG) 27,517 kt Gold 6.28 g/t 5,559 koz
Measured Total 77,052 kt Gold 2.39 g/t 5,920 koz
Indicated In-Situ (UG) 254,827 kt Gold 5.94 g/t 48,656 koz
Inferred In-Situ (UG) 22,564 kt Gold 9.1 g/t 6,602 koz
Total Resource Tailings 49,535 kt Gold 0.23 g/t 361 koz
Total Resource In-Situ (UG) 304,907 kt Gold 6.2 g/t 60,816 koz
Total Resource Total 354,442 kt Gold 5.37 g/t 61,177 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,903 / oz†   1,340 / oz†   1,207 / oz†  
All-in costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 2,012 / oz†   1,400 / oz†   1,234 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Growth Capital M USD  ......  Subscription required  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 40   66   70.1  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 58   82   77.9  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 210.1   354.1   358.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -224.7   -25.3   13  
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Heavy Mobile Equipment as of July 7, 2022:
HME TypeModel
Load-Haul-Dump (LHD) ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 8, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019

Corporate Filings & Presentations:

DocumentYear
Other 2022
Other 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Financial Review 2016
Year-end Mineral Reserves 2016
Financial Review 2015
Year-end Mineral Reserves 2015
Annual Report 2014
Annual Report 2014
Financial Review 2014
Technical Report 2012
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