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South Africa
Doornkop Mine

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 Location:
11 km E from Randfontein, South Africa

  Address:
Valkfontein 238-Iq
Soweto
South Africa
1829
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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
  • Conventional narrow-reef mining
  • Sequential grid mining
  • Longwall
  • Breast stoping with strike pillars
Production Start...
Mine Life16 years (as of Jan 1, 2022)


Owners

Source: p. 61,63
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
Randfontein Estates Ltd. (operator) 100 % Direct
Doornkop is wholly-owned and operated by Harmony. The current mining right is held by Randfontein Estates Limited (REL), a wholly owned subsidiary of Harmony.

Contractors

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Deposit Type

  • Conglomerate hosted


Summary:

Doornkop is situated on the northwestern margin of the Witwatersrand Basin of South Africa, one of the most prominent gold provinces in the world. While there are several gold-bearing conglomerate reefs present within the mining right area, only the Kimberley Reef and South Reef are considered to have prospects for economic extraction at this stage. In the West Rand Goldfield, the Kimberley Reefs include a number of different gold-bearing conglomerate horizons. At Doornkop, it is the Kimberley K9 Reef horizon which comprises the Mineral Resources along with the South Reef. The K9 Reef rests on an unconformity and is a multi-pulse conglomerate which is divided into four cycles, each consisting of an upper conglomerate and a lower quartzite. The South Reef comprises a basal conglomerate unit and a cycle of trough cross-bedded sediments. The South Reef is dominated by silicate phases such as quartz, carbon (seam and specks), as well as sulphide phases such as pyrite, pyrrhotite and chalcopyrite. While the upper cycles may carry some gold values, up to 95% of the gold present is located in the lower cycle. Both the Kimberley Reef and the South Reef have been subjected to faulting and are intruded by a series of dykes and sills of various ages that cut across the reefs. The gold mineralisation is interpreted to have succeeded a period of deep burial, fracturing, and alteration. The gold and other elements are believed to have precipitated through the reaction of hydrothermal flu ........


Mining Methods

  • Conventional narrow-reef mining
  • Sequential grid mining
  • Longwall
  • Breast stoping with strike pillars


Summary:

Doornkop is a deep-level single-shaft operation. The operation focuses on narrow-reef conventional mining of the South Reef gold-bearing conglomerate reef. Mining is undertaken to a depth of 2 219m below surface.

Doornkop is a single-shaft operation currently exploiting the South Reef to some 2000m below surface. The narrow South Reef is exploited by means of conventional stoping. Mining of the Kimberley Reef was suspended during FY14 to focus on the build-up of production from the South Reef and to prevent losses as a result of the lower gold price. Mining of the Kimberley Reef may resume should economic circumstances improve sufficiently.

The mining method used is longwall mining with stability pillars on major geological structures. The flat dip, which results in the development of long cross cuts, presents challenges in terms of ore handling, especially for the bottom part of the raises, ventilation and in the long lead times between the start of cross cut development to completion of stoping per raise line.

The mining method used at Doornkop is conventional breast mining, in a sequential grid, also known as sequential grid mining (“SGM”).

Doornkop does not use backfill for the support of stopes. The SGM method makes use of dip pillars and reduced mining spans with pre-developed tunnels, aimed at controlling geotechnical stress. The mining sequence at Doornkop is typically a V-shaped configuration, colloquially referred to as th ........


Crushing and Grinding


Processing

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Summary:

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^ Guidance / Forecast.

Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required110,24585,93987,772
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required730 kt696 kt641 kt
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Reserves at June 30, 2022:
Doornkop 2022 cut-off 739 cmg/t.

CategoryTonnage CommodityGradeContained Metal
Proven 5.9 Mt Gold 4.46 g/t 842 koz
Probable 7.9 Mt Gold 4.29 g/t 1,093 koz
Proven & Probable 13.8 Mt Gold 4.36 g/t 1,934 koz
Measured 22.9 Mt Gold 4.23 g/t 3,120 koz
Indicated 16.9 Mt Gold 4.35 g/t 2,368 koz
Inferred 13.4 Mt Gold 4.38 g/t 1,887 koz
Total Resource 53.3 Mt Gold 4.31 g/t 7,375 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,001 / oz   1,047 / oz   831 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,230 / oz   1,288 / oz   1,016 / oz  
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Operating Costs:

Units20172016
Total operating costs ($/t milled) USD 127105

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M ZAR  ......  Subscription required
Capital expenditures M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 21  USD 18  USD
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 152  USD 114  USD
Gross profit M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 40  USD 23  USD
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Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 26, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
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
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
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 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
Form 20-F 2016
Integrated Report 2016
Year-end Mineral Reserves 2016
Other 2014
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