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South Africa
Unisel Mine

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 Location:
8 km S from Welkom, South Africa

  Regional Office:
Randfontein Office park Corner of Main Reef Road and Ward Avenue
P.O. Box 2
Randfontein
South Africa
1760
Phone  ...  Subscription required
Fax+27-11-692-3879
EmailEmail
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusClosing / Closed
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Pillar mining
  • Breast mining
Production Start...
During fiscal 2021 a decision was taken to close Unisel mine as it has reached the end of its commercially viable life.


Owners

Source: p. 88
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
In 1995, Randgold purchased Unisel from Gengold. When Randgold split, Unisel became part of the Harmony stable of mines.

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Conglomerate hosted


Summary:

Unisel mines gold-bearing reefs from the Witwatersrand Super Group, which is situated on the Kaapvaal Craton. The mine lies in the Free State goldfields on the south-western edge of the basin. The Basal and Leader reefs are the main economic horizons in the Unisel area. The Basal Reef occurs at the base of the Harmony Formation and overlies the footwall beds (Welkom Formation) with a marked unconformity. This erosional unconformity cuts progressively deeper into the footwall when traced from north to south. The Leader Reef lies at the base of the Dagbreek Formation. The separation between the Basal and the Leader reefs varies from subcrop of the Basal against the Leader Reef in the west to 17m in the eastern areas of the lease. The subcrop is beyond the mine lease area, within the lease area between the two major gold-bearing reefs, which varies from 13m in the west to 17m in the east. The Middle Reef is a channelised deposit forming a discreet channel running from west to east. This channel lies to the north of the shaft. Stratigraphically, it lies between the Basal and Leader reefs.

Structurally, the sedimentary package, within which Unisel mines, strikes north south and dips to the east with dips ranging between 25 and 40 degrees. Faulting consists predominantly of north-south trending normal faults dipping to the west with a right lateral displacement. The most significant is the Stuirmanspan fault of about 800m and the Unisel fault of 110m. West-east trending ........


Mining Methods

  • Pillar mining
  • Breast mining


Summary:

Mining in the stopes has ceased, with closure activities underway including the successful, safe extraction of the shaft pillar.

Unisel is a mature, underground, single-shaft mining operation, operating at depths from 1 100m to 2 200m below surface. Mining operations are scattered and, due to the age of the shaft and the extent of mining, lie 2-4km from the shaft.

Mining operations take place from 2 level down to 13 level, by means mainly of breast panel mining. Limited down-dip panels and wide raises are undertaken periodically. Footwall development comprises haulages and crosscuts with service ways and ore passes developed to access the reef horizons. Face length cannot exceed 30m and strike pillars are left as support between the panels.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:
The FY21 results are for the four months until 31 October 2020.

CommodityUnits2021202020192018201720162015
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required41,15251,28054,78554,495
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required256 kt376 kt394 kt424 kt
Subscription required - Subscription is required.

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 0.2 Mt Gold 4.81 g/t 29 koz
Probable 0.1 Mt Gold 4.13 g/t 7 koz
Proven & Probable 0.2 Mt Gold 4.65 g/t 36 koz
Measured 0.6 Mt Gold 8.22 g/t 156 koz
Indicated 0.2 Mt Gold 8.62 g/t 53 koz
Total Resource 0.8 Mt Gold 8.32 g/t 209 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,463 / oz   1,203 / oz   949 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,642 / oz   1,354 / oz   1,064 / oz  
Subscription required - Subscription is required.

Operating Costs:

Units20172016
Total operating costs ($/ton milled) USD 141111

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required 7   6   4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 57   67   64  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -3   6   12  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 14, 2022
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
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Form 20-F 2017
Integrated Report 2017
Other 2017
Other 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2017
Form 20-F 2016
Integrated Report 2016
Year-end Mineral Reserves 2016
Other 2015
Subscription required - Subscription is required.

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