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South Africa
Koffiefontein Mine

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 Location:
80 km S from Kimberli, South Africa

  Address:
1 Du Preez Street
PO Box 80
Koffiefontein
South Africa
9986
Phone  ...  Subscription required
Fax(053)-205-5028
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Diamond
Mining Method
  • Sub-level caving
Production Start...
Mine Life2025
January 16, 2023 - Production at Koffiefontein will remain halted while Petra Diamonds Ltd. continues to engage with its key stakeholders to determine the optimal way forward in moving towards placing the mine on care and maintenance as part of finalising a responsible process towards mine closure.


Owners

Source: p. 171,189
CompanyInterestOwnership
Petra Diamonds Ltd. 74 % Indirect
Ownership Tree
Petra Diamonds: 74%
Kago Diamonds (Pty) Ltd: 14%
Itumeleng Petra Diamonds Employee Trust (IPDET): 12%.
The IPDET holds a 12% interest in each of the Group’s South African operations, with Petra’s commercial BEE Partners holding the remaining 14% interest through their respective shareholdings in Kago Diamonds, in which Petra has a 31.46% interest. The effective interest percentages of Petra Diamonds attributable to Koffiefontein is 78.4%.

Contractors

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Deposit Type

  • Kimberlite


Summary:

Wagner (1914) described two main kimberlite varieties, as well as examples of late-stage internal dykes. Clement (1982) recognized three varieties of kimberlite in the main pipe, which he named KOF1-3. These comprised two diatreme-facies (KOF1 and 2) and a hypabyssalfacies kimberlite (KOF3). The KOF-1 variety was a TKB that occupied the main pipe, whereas KOF-2 was a TKB that occupied the “West Fissure”. The KOF-3 variety was the hypabyssal intrusion that occurred as the “East Fissure”. A further notable feature was the presence of a large floating reef comprising various Karoo lithologies in the main pipe. A satellite kimberlite pipe named Ebenhaezer, which also contained diatreme-facies kimberlite, is located close to the main pipe. Clement speculated that these two pipes once coalesced to form a single large crater.

Mapping of deeper levels by Naidoo et al. (2004) found evidence for at least two main volcaniclastic kimberlite varieties in the main pipe, and demonstrated that these were geochemically distinct based on their groundmass spinel compositions. They described the layered nature of the “floating reef” as well as intermixing between layered breccias and relatively lithic-poor volcaniclastic kimberlite. They also demonstrated that the kimberlite between the floating reef and the eastern contact at depth to be geochemically distinct from the main kimberlite variety that had been mined throughout the life of the mine. They called into question the appropria ........


Mining Methods

  • Sub-level caving


Summary:

Mining method: Underground sub level cave.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Diamond carats  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required52,53751,17362,190
All production numbers are expressed as mineral.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1,000,726 t649,259 t667,821 t
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Reserves at June 20, 2022:
Resource bottom cut-off (Koffiefontein underground and Ebenhaezer): 1.15mm.
Reserve bottom cut-off: 1.15mm.

CategoryTonnage CommodityGradeContained carats
Probable 1.9 Mt Diamond 7.7 cpht 0.15 M carats
Indicated 16.1 Mt Diamond 8 cpht 1.28 M carats
Inferred 121.4 Mt Diamond 3.3 cpht 3.96 M carats
Total Resource 137.5 Mt Diamond 3.8 cpht 5.24 M carats

Operating Costs:

Units20222021202020192018201720162015
Total operating costs ($/t milled) ZAR 1,106651510450596532317303

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 12.3   18.8  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 2.7   5.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.2   28.4  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -78.5   -10.9  
Subscription required - Subscription is required


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 2, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 2, 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

Corporate Filings & Presentations:

DocumentYear
Annual Report 2022
Sustainability Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Mine Operations Plan 2017
Sustainability Report 2017
Annual Report 2016
Sustainability Report 2016
Other 2008
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