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South Africa
Mponeng (West Wits) Mine

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 Location:
1.7 km S from Carletonville, South Africa

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

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Uranium
Mining Method
  • Sequential grid mining
  • Breast mining
Processing
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2048
Guidance on Mponeng will be shared in February 2021, once the asset have been integrated into Harmon's portfolio.
The acquisition of Mponeng and Mine Waste Solutions, which was finalised at the end of September 2020, will contribute positively to production and revenue in FY21. Mponeng is situated close to our Kusasalethu mine in the West Witwatersrand (West Wits) region. While each of these operations has its own treatment plant, there are possible synergies regarding surface retreatment that can be explored
Latest NewsHarmony takes control of the Mponeng and Mine Waste Solutions assets and strengthens its South African executive operational management structure     October 1, 2020


Owners

Source:
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
1 October 2020. Harmony Gold Mining Company Limited (“Harmony” or “the Company”) is pleased to announce that the acquisition of Mponeng mine and Mine Waste Solutions from AngloGold Ashanti Limited was concluded yesterday and the purchase price of the Rand equivalent of $200 million was paid.

Deposit Type

  • Hydrothermal


Summary:

The Ventersdorp Contact Reef (VCR) is the main reef horizon mined at Mponeng Mine.

The VCR consists of a quartz pebble conglomerate, which can be up to 3m thick in places. The footwall stratigraphy, following periods of uplift and erosion, controlled the development and preservation of the VCR, which is characterised by a series of channel terraces preserved at different relative elevations, and the highest gold values are preserved in these channel deposits.

The different channel terraces are divided by zones of thinner slope reef, which are of lower value and become more prevalent on the higher terraces and on the harder footwall units.

The Carbon Leader Reef (CLR) is the other gold bearing reef reported as part of the total Mineral Resource for Mponeng. The CLR is located near the base of the Johannesburg Subgroup, which forms part of the Central Rand Group of the Witwatersrand Supergroup of rocks.

The CLR and VCR at Mponeng Mine are separated by approximately 900m of shales and quartzites.

The CLR in the West Wits consists of, on average, a 20cm thick, tabular, auriferous quartz pebble conglomerate and three sedimentary facies.

The VCR displays strong alteration features, which can be explained by the hydrothermal fluids that infiltrated the reef and have overprinted on the original mineral assemblage. Portions of the reef contain authigenic sulphides such as pyrite, pyrrhotite, chalcopyrite, spahelerite and galena, incorporated in the conglomerate matrix. Gold associations with these mineral assemblages indicate a strong correlation of gold mobilisation and redistribution at the time of the hydrothermal fluid influx. There is also a strong association of gold with a chloritisation event focused along the reef horizon.

Gold was precipitated by cooling and reactions between the fluids and wallrock, in this case pyritic conglomerates. Gold mineralisation was enhanced in certain areas of high fluid throughput, which were often the sites of high carbon precipitation and early alteration in the case of the CLR.


Mining Methods

  • Sequential grid mining
  • Breast mining


Summary:

Mponeng Mine is a deep level gold mine operating between 3,160m and 3,740m below mine datum (BMD) and is currently the deepest mine in the world with development at 3,841m BMD.

The primary reef being mined is the Ventersdorp Contact Reef (VCR). The Carbon Leader Reef (CLR) that was historically mined at the now closed TauTona mine, is planned to be mined in the Mponeng life of mine (LOM) extension project. A sequential grid mining method is employed to extract the gold from the deep, narrow, tabular orebody. The grid is pre-developed through a series of haulages and crosscuts. Stoping takes place by means of breast mining using conventional hand held drill and blast techniques. The selective mining unit (SMU) is 100 x 100m.


Crushing and Grinding


Processing

  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Mponeng has its own processing plant situated adjacent to the mine. Ore and waste material is hoisted separately with ore being delivered to the plant by means of a conveyor belt and the waste rock going to the low grade stockpile.

Ore mined is treated and smelted at the Mponeng gold plant, which also processes low grade ore from the stockpile adjacent to the shaft.

The ore is initially ground down by means of semi-autogenous milling after which a conventional gold leach process incorporating liquid oxygen injection is applied. The gold is then extracted by means of carbon-in-pulp (CIP) technology.

The plant conducts electro-winning and smelting (induction furnaces).

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Head Grade, g/t 7.338.197.337.98.448.99

Production:

CommodityUnits201920182017201620152014
Gold koz  ......  Subscription required  ......  Subscription required224254219313
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1.1 Mt0.8 Mt1.1 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained 
Commodity
Proven & Probable 36.47 Mt Gold 9.93 g/t 11.65 M oz
Proven & Probable 36.47 Mt Uranium (U3O8)
Total Resource 82.87 Mt Gold 17.33 g/t 46.18 M oz
Total Resource 82.87 Mt Uranium (U3O8) 310 g/t 27.81 M lbs

Commodity Production Costs:

CommodityUnits201920182017201620152014
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 1,014 / oz 779 / oz 874 / oz 746 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 1,259 / oz 1,011 / oz 1,170 / oz 981 / oz
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 85  
Sustaining costs M USD 97  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 11, 2019
....................... Subscription required ....................... Subscription required Subscription required Jun 11, 2019
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
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
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Integrated Report 2017
Integrated Report 2016
Subscription required - Subscription is required.

News:

NewsDate
Harmony takes control of the Mponeng and Mine Waste Solutions assets and strengthens its South African executive operational management structure October 1, 2020

Aerial view:

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