South Africa

Tshepong South(Phakisa) Mine

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Overview

Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Scattered stoping
  • Sequential grid mining
  • Undercut mining
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ShapshotTshepong South mine is a mature, moderate to deep-level underground operation using conventional underground mining methods. Ore mined is processed at the Harmony One plant, with gold recovered using the gold cyanide leaching process.

The Tshepong Operations were disaggregated into two separate CGUs being the Tshepong North CGU and the Tshepong South(Phakisa) CGU, for impairment testing at 30 June 2022. This was due to the decision taken during the FY23 budget process in June 2022, to reinvest in the two individual operations to maximise individual profitability following the change to Tshepong North's life-of-mine with the sub-75 decline project being halted. Based on the forwardlooking nature of the impairment assessment, a separate impairment calculation was prepared for each of the CGUs. Tshepong North and Tshepong South are disclosed as separate reportable segments for the 2023 financial year, therefore the disclosures for 2022 and 2021 have been re-presented accordingly.
Related AssetTshepong North

Owners

SourceSource
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. (operator) 100 % Indirect
Tshepong South (Phakisa) is wholly owned and operated by Harmony Gold.

Contractors

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Deposit type

  • Conglomerate hosted

Summary:

shepong South is situated in the Free State Goldfield, on the southwestern margin of the Witwatersrand Basin of South Africa, one of the most prominent gold provinces in the world. The major gold bearing conglomerate reefs are mostly confined to the CRG of the Witwatersrand Supergroup.

The general orientation of the Witwatersrand Supergroup succession in this goldfield is interpreted as north-trending, within a syncline that is plunging to the north. The syncline has been divided by faults into the Odendaalsrus, Central Horst and Virginia sections. The Tshepong South mining right area is also affected by the Tribute fault (~270m) and Arrarat Fault (~180m) to the far south-east of the shaft.

The principal gold-bearing orebody is the stratiform and strata-bound Basal Reef (known as the Basal Reef Zone or BRZ). This unit comprises a thin conglomerate at the base of the BRZ, overlain by clean “placer” quartzites. The Basal Reef is underlain by a thick series of siliceous and argillaceous quartzites comprising the Welkom formation and overlain by shales and quartzites of the Harmony formation, both of the Johannesburg sub-group of the Central Rand Group. Although not apparent within the mine lease area, the Basal Reef sits unconformably on the Welkom formation.

The Basal Reef dips towards the east at 25° in the north and up to 45° in the south. The Lower Cycle Black Chert facies predominates in the north with a north-west south-east value trend. The reef consists of an oligomictic small pebble matrixsupported conglomerate lag with fly-speck carbon contact. The rest of the reef package constitutes barren siliceous fine-grained reef quartzite. The entire reef package reaches up to 160cm thick and is overlain by 1cm to 30cm of lower khaki shale. This in turn is overlain by the approximately 3-4m thick waxy brown leader quartzite, above which lies the 3-4m thick upper khaki shale.

The Upper Cycle Black Chert facies Basal Reef prevails in the south of the lease area, and consists of a slightly polymictic (yellow shale specks present), matrix-supported medium-pebble conglomerate with a more gradational contact absent of carbon where mineralisation is associated with fine disseminated and buckshot pyrite. The conglomerate is slightly thicker compared to the Lower Cycle, but is also overlain by barren reef quartzite, the entire package being characteristically up to only 40cm thick. The lower khaki shale is up to 1m thicker.

The Central Rand Group itself is overlain in turn by lavas and sediments of the Ventersdorp System and the more recent sediments of the Karoo Group.

Mineralization also occurs within the stratigraphically higher A and B reefs of the Kimberley (formerly Aandenk) Formation, within the Turffontein subgroup of the CRG. However, only the B Reef can be economically extracted.

Mineralization is associated with the presence of medium to coarse, clast-supported oligomictic pebble horizons. The presence of allogenic pyrite and detrital carbon is also common.

The B Reef occurs approximately 145m stratigraphically above the Basal Reef and varies in thickness from 30cm to 170cm. The conglomerate varies in character depending on the facies, with B1 being a small to medium pebble conglomerate and usually no more than 30cm thick with abundant carbon. The B2 facies is a small pebble lag in an argillaceous quartzite, with little to no mineralisation. B3 facies is a 20 to 150cm thick conglomerate, mature, well packed, with pebble sizes varying from small to cobble size, very polymictic, normally with abundant pyrite and some carbon. This is the most common facie.

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

Until 2021, all production and cost data are reported for Tshepong Operations, which was restructured, and from FY21 are reported separately as Tshepong North and Tshepong South.
CommodityUnits202420232022202120202019201820172016
Gold oz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe256,146 302,026 283,827 289,968 
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
* Combined production for Tshepong South(Phakisa) Mine and Tshepong North Mine

Operational metrics

Metrics20232022202120202019201820172016
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe1,612 kt1,716 kt1,695 kt1,774 kt

Production Costs

CommodityUnits2023202220212020201920182017
Cash costs Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,396 / oz   987 / oz   953 / oz  
All-in sustaining costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,103 / oz   1,245 / oz   1,161 / oz  

Financials

Units20242023202220212020201920182017
Capital expenditures (planned) M USD  ....  Subscribe
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 80   78   52  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 330   419   372  
Gross profit M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 50   123   102  

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 15, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 15, 2023
....................... Subscription required ....................... Subscription required ........... Subscription required ........... Subscription required Subscription required Nov 15, 2023

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

Aerial view:

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