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South Africa
Mponeng Mine

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 Location:
1.7 km S from Carletonville, South Africa

  Address:
955 Park Ave, Carletonville
West Wits
South Africa
2499
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sequential grid mining
  • Breast stoping with strike pillars
Production Start...
Mine Life7 years (as of Jan 1, 2022)
Mponeng is a deep level underground gold mine and the deepest mine in the world.

The Depth Extension project is aimed at mining the orebody below existing infrastructure to safely and productively extend the life of mine. The VCR reef requires the existing infrastructure to be extended below 126 level. The Carbon Leader Reef requires new infrastructure below 120 level. Feasible access of these orebodies could extend Mponeng mine life considerably.

A feasibility study was approved for assessing the VCR orebody below 126 level and which has commenced.

The feasibility study is planned to be completed in FY23.


Owners

Source: p. 93
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. (operator) 100 % Indirect
Mponeng is wholly-owned and operated by Harmony.

Contractors

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Deposit Type

  • Conglomerate hosted


Summary:

Mponeng is situated on the northwestern margin of the Witwatersrand Basin of South Africa, one of the prominent gold provinces in the world. There are seven gold-bearing conglomerates within the lease area, of which only the Ventersdorp Contact Reef (VCR) and Carbon Leader Reef (CLR) are economically viable. The Ventersdorp Contact Reef (VCR) is the main reef horizon mined at Mponeng Mine. The VCR forms the base of the Ventersdorp Supergroup, which caps the Witwatersrand Supergroup through an angular unconformity. The overlying Ventersdorp Lavas halted the deposition of the VCR, preserving it in its current state. The Carbon Leader Reef (CLR), previously mined at Tau Tona and Savuka mines, is found within the Witwatersrand Supergroup. The CLR lies 900m beneath the VCR on Mponeng. The VCR is preserved across the Mponeng lease area and dips at approximately 22 degrees in a SSE direction. The VCR was deposited on uneven footwall strata due to uplift and is now represented by a shallow angular unconformity. The footwall lithologies to the VCR therefore vary across Mponeng Mine as the unconformity cuts deeper in an easterly direction into older strata of the Witwatersrand Supergroup. Fluvial action during deposition of the VCR continually eroded and reworked the conglomerate, creating steep slopes and embayment’s between relatively undisturbed terraces. The CLR conglomerate was deposited by several sedimentary cycles. Erosion and reworking of the conglomerate and quartzite sed ........


Mining Methods

  • Sequential grid mining
  • Breast stoping with strike pillars


Summary:

Mponeng is a deep level underground gold mine currently operating at depths ranging between 3,160m and 3,740m BMD, and currently the deepest mine in the world with development at 3,841m BMD. Potential future mining operations at Mponeng are expected to deepen the shaft bottom to 4,227m BMD. The reef portion currently being mined at Mponeng is accessible between 3,000 – 3,600m BMD.

There are two mining methods in practice at Mponeng. While Mponeng’s business plan is based primarily on the SGM method, there are sections of the mine that are still operating using the breast mining method. The mining sequence is a V-shaped configuration, colloquially referred to as the “inverted Christmas tree”. An underhand face configuration is adopted when mining towards the west and an overhand face configuration when mining towards the east.

The orebody is extracted mostly by breast-mining methods with associated waste mining in addition to the reef being extracted. The dilution from these waste sources is captured and incorporated in the tonnage calculation, with historical performance being the benchmark. The mine exploits the Ventersdorp Contact Reef as its primary orebody. The economic reef horizons are mined between 3 160m and 3 740m below surface.

In addition to the in-stope dilution sources being accounted for allowance is also made for dilution from development waste sources to mill by both schedule results and factors based on history. Widths used a ........


Crushing and Grinding
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Processing

Source: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:
Production in 2020 for the nine months to September 2020

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required265224254
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20222021201920182017
Tonnes processed  ......  Subscription required  ......  Subscription required1.3 Mt1.2 Mt1 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2022:
Mponeng 2022 cut-off 971 cmg/t.

CategoryTonnage CommodityGradeContained Metal
Proven 2.3 Mt Gold 8.09 g/t 597 koz
Probable 4.3 Mt Gold 9.12 g/t 1,258 koz
Proven & Probable 6.6 Mt Gold 8.76 g/t 1,855 koz
Measured 4 Mt Gold 15.65 g/t 2,037 koz
Indicated 21.2 Mt Gold 14.34 g/t 9,785 koz
Inferred 29.1 Mt Gold 13.35 g/t 12,496 koz
Total Resource 54.4 Mt Gold 13.91 g/t 24,319 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD  ......  Subscription required  ......  Subscription required
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 977 / oz   1,014 / oz   779 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,177 / oz   1,259 / oz   1,011 / oz  
All-in costs Gold USD  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M ZAR  ......  Subscription required
Capital expenditures M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 54  USD 72  USD
Revenue M  ......  Subscription required  ......  Subscription required
Gross profit M  ......  Subscription required  ......  Subscription required
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Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 28, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
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

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
Form 20-F 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Fact Sheet 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Integrated Report 2017
Other 2017
Integrated Report 2016
Subscription required - Subscription is required.

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