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South Africa
Doornkop Mine

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 Location:
11 km E from Randfontein, 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
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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
  • Longwall
Processing
  • Smelting
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life16 years (as of Jan 1, 2020)


Owners

Source: p. 50
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
Harmony acquired Doornkop in January 2000. The South Reef project was relaunched in January 2003.

Deposit Type

  • Conglomerate hosted


Summary:

The Doornkop shaft lease area lies to the south-east of the major north-easterly striking Roodepoort fault, which dips to the south and constitutes the southern Detailed Mineral Resource and Mineral Reserve estimates are presented in this section edge of the Witpoortjie horst block or gap.

This horst block comprises the stratigraphically older sediments of the West Rand Group, with the overlying Central Rand Group sediments having been removed by erosion. Doornkop is bounded by the Roodepoort fault and a number of other faults, including the Saxon fault, which constitute conspicuous structural breaks. Another major fault, the Doornkop fault, which trends in an east-west direction, occurs toward the southern portion of the lease area. This fault dips to the south and has an up-throw to the north.

As nearly the entire upper Witwatersrand section lies within the lease area, all major zones are present. However, given the distance of the area from the primary source of gold, the number of economic bands and their payability is limited. Eight of the well-known reefs are present in the area but only the South Reef and potentially the Kimberley Reef are considered viable at this stage.

The South Reef is between 7.5m and 60m above the Main Reef horizon. The hanging wall of the South Reef consists of siliceous quartzites with non-persistent bands of ‘blue shot’ grit and thin argillite partings. The South Reef footwall is a light coloured and fairly siliceous quartzite. Secondary conglomerate bands and stringers in the hanging wall and footwall of the South Reef may contain sporadic gold values. The general strike of the reef is east-west with a flat dip from 5 to 15 degrees.

Exploration drilling is set to continue in the coming financial year, and will target potential high-grade areas and those with limited geological information, to further increase geological confidence.


Mining Methods

  • Conventional narrow-reef mining
  • Longwall


Summary:

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.


Crushing and Grinding


Processing

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

Source: Subscription required

Summary:

The gold plant consists of a milling section for grinding of ore, thickeners for dewatering (pulp for leach feed), a leach section for dissolution of gold, using liquid sodium cyanide as one of the reagents, Carbon in Pulp for adsorption of dissolved gold and a recovery section which consists of elution, electro-wining and a smelt house. All tailings are pumped to a Tailings Storage Facility, adjacent to the plant on the northern side.

The Doornkop TSF consists of one active compartment which is raised in the upstream direction. The residue is deposited hydraulically by means of ring feed pipeline to open ended pipe deposition points along the day wall, pool wall including the wing walls both sides of the penstock and into the basin. All supernatant and storm water is decanted off the deposits through a gravity penstock that discharges into a canal draining to the return water dam located east of the TSF. From the return water dam, the water is pumped back to the plant for reuse.

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required4.934.174.334.423.53

Production:

CommodityUnits2021202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required110,24585,93987,77285,618
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required730 kt696 kt641 kt630 kt603 kt
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Doornkop 2020 cut-off 800 cmg/t.

CategoryTonnage CommodityGradeContained Metal
Proven 5.2 Mt Gold 5.33 g/t 896 koz
Probable 4.6 Mt Gold 5.03 g/t 742 koz
Proven & Probable 9.8 Mt Gold 5.19 g/t 1,638 koz
Measured 22.7 Mt Gold 4.42 g/t 3,224 koz
Indicated 16.1 Mt Gold 4.37 g/t 2,262 koz
Inferred 14.5 Mt Gold 4.69 g/t 2,180 koz
Total Resource 53.2 Mt Gold 4.48 g/t 7,666 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 1,001 / oz 1,047 / oz 831 / oz 1,092 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 1,230 / oz 1,288 / oz 1,016 / oz 1,362 / oz
Subscription required - Subscription is required.

Operating Costs:

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

Financials:

Units2021202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required21   18   14   21  
Revenue M USD  ......  Subscription required  ......  Subscription required152   114   102   107  
Gross profit M USD  ......  Subscription required  ......  Subscription required40   23   30   12  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 25, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
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 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
Subscription required - Subscription is required.

Aerial view:

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