South Africa

Driefontein Mine

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Overview

Mine TypeUnderground
StatusActive
Commodities
  • Gold
Mining Method
  • Breast mining
  • Pillar extraction
  • Scattered stoping
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SnapshotThe Driefontein operation is a mature, intermediate to ultra-deep level gold mine. It consists of four vertical operating shafts, No. 1 shaft, No. 4 shaft, No. 5 shaft and No. 8 shaft, extending down to 50 level at No. 5 shaft, approximately 3,300m below surface.

The No. 4 shaft pillar extraction project is in progress, with wide raise development and selected stoping being done on the perimeter, making up one third of the total Mineral Reserves for No. 4 shaft.

he exploration of the secondary VCR at No. 1 and No. 5 shafts has yielded exceptional results, with the contribution from the VCR increasing year-on-year and by over 300% in the last 5 years. The Driefontein LoM has in turn been extended by 6 years when compared to the status 5 years ago. Continuous exploration drilling of the VCR at No. 1 Shaft and No. 5 Shaft is likely to continue playing a critical role in securing LoM extensions at these shafts.

Owners

SourceSource
CompanyInterestOwnership
Sibanye-Stillwater Ltd. 100 % Indirect
Sibanye-Stillwater owns and manages 100% Driefontein operation.

Contractors

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Deposit type

  • Paleoplacer

Summary:

Driefontein is located along the West Wits Line that forms part of the Far West Rand of the Witwatersrand Basin. The Witwatersrand Basin comprises a 6.000m vertical thickness of sedimentary rocks, extending laterally for some 350km northeast to southwest by some 150km northwest to southeast, generally dipping at shallow angles toward the centre of the Witwatersrand Basin. The Witwatersrand Basin outcrops at its northern extent near Johannesburg, but to the west, south and east it is overlaid by up to 4,000m of volcanic and sedimentary rocks.

Gold mineralisation occurs within laterally extensive quartz-pebble conglomerates called reefs, which are developed above unconformable surfaces. As a result of faulting and primary controls on mineralisation processes, the goldfields are not continuous and are characterised by the presence or dominance of different reef units. The reefs are generally less than two metres in thickness and are widely considered to represent laterally extensive braided fluvial deposits or unconfined flow deposits, which formed along the flanks of alluvial fan systems around the edge of an inland sea. Dykes and sills of dolerite composition are developed within the Witwatersrand Basin and are associated with several intrusive and extrusive events.

Gold generally occurs in native form, often associated with pyrite, carbon and uranium. Pyrite and gold within the reefs display a variety of forms, some obviously indicative of detrital transport within the depositional system and others suggesting crystallisation within the reef itself.

The Driefontein operation exploits three primary reefs, namely the Ventersdorp contact reef (VCR) located at the top of the Central Rand Group, the Carbon leader reef (CLR) near the base of the group, and the Middelvlei reef (MVR), which stratigraphically occurs some 50 to 75 metres above the CLR.

The VCR strikes east-north-east and has a regional dip of about 21° to the south-southeast. CLR strikes west-south-west and dips to the south at approximately 25°; MVR strikes west-south-west, with a regional dip of approximately 22° to the south-southeast. The reefs are generally less than two metres thick, and are widely considered to represent extensive fluvial fans, and as such they are laterally continuous with clear patterns of mineralisation governed by sedimentary characteristics. Most of the mining takes place on the VCR, which constitutes 59% of the Mineral Reserves, the CLR 33%, and MVR the remaining 8%.

All these reefs are disrupted by structures which are faults and dykes. These structures have varying displacements from centimetres to hundreds of metres and can affect mining to various extents.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityUnits202320222021202020192018201720162015
Gold koz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe166308482519558
All production numbers are expressed as metal in doré.

Operational metrics

Metrics202320222021202020192018201720162015
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe906 kt3,143 kt6,042 kt5,971 kt5,772 kt
Annual milling capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe

Production Costs

CommodityUnits2023202220212020201920182017
Total cash costs (sold) Gold USD 961 / oz  
All-in sustaining costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 2,186 / oz **   1,661 / oz **   1,141 / oz **  
All-in costs Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 2,186 / oz **   1,661 / oz **   1,148 / oz **  
** Net of By-Product.

Operating Costs

Currency202320222021202020172016
Total operating costs ($/t milled) ZAR 5,267  6,289  3,778  4,091  1,022  937  

Financials

Units2023202220212020201920182017
Sustaining costs M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 163   228.1   235  
Capital expenditures M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 675.9   1,046   1,156  
Revenue M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 3,303   5,111   8,077  
Gross profit M ZAR 1,873  
Operating Income M ZAR
Pre-tax Income M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe -2,605  
After-tax Income M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe -2,553   -3,522   413  
EBITDA M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe -1,333   -648.3   1,841  
Book Value M ZAR  ....  Subscribe  ....  Subscribe  ....  Subscribe

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 7, 2024
....................... Subscription required ....................... Subscription required Subscription required May 7, 2024

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2023
...... Subscription required ...... Subscription required ...... Subscription required 2022
...... Subscription required ...... Subscription required ...... Subscription required 2021
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...... 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

Aerial view:

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