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South Africa
Finsch Mine

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 Location:
36 km E from Postmasburg, South Africa

  Address:
PO Box 7
Lime Acres
South Africa
8410
Phone  ...  Subscription required
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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
  • Diamond
Mining Method
  • Block caving
  • Sub-level caving
Processing
  • Dense media separation
  • X-Ray sorting
Mine Life25 years (as of Jan 1, 2020)
Finsch is one of the world’s significant diamond mines and South Africa’s second largest diamond operation.


Owners

Source: p. 163
CompanyInterestOwnership
Petra Diamonds Ltd. 74 % Indirect
Petra Diamonds Ltd.: 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 Cullinan is 78.4%.

Deposit Type

  • Kimberlite


Summary:

Finsch has an age of 118 ± 2.8 Ma (Smith et al., 1985), and is a Group-2 kimberlite (Smith, 1983a; Fraser and Hawkesworth, 1992). The geology of Finsch Mine in the open-pit and on the 348 m underground sampling level was described by Clement (1982). The pipe was emplaced through a thick sequence of Proterozoic, Griqualand West sequence sedimentary rocks comprising dolomites, banded iron formation and shales. Preserved within the pipe are large fragments of Karoo-aged sediments, lavas and dolerite which were clearly present at the time of emplacement, but have been subsequently eroded away.

Clement defined eight kimberlite varieties in the mine which he called F1–F8. F1 was described as being the most significant volumetrically and was classified as a diatreme-facies TKB. This variety hosted numerous very large blocks of down rafted Karoo basalt lava and sedimentary rocks. The F5 variety was also described as TKB, but occurred within a satellite portion of the pipe called “the precursor”. The other varieties were classified as hypabyssal kimberlite or kimberlite breccia.

Exploration of deeper levels of the mine found that the F8 variety increased in size with depth, and that the lithiccontent of the F1 declined with depth. Mapping of deeper levels has also revealed the presence of steeply dipping bedding planes within both the F1 and F8 varieties. Ekkerd et al. suggested that the F1 and F8 could be the same kimberlite, varying only in lithic content and alteration.


Mining Methods

  • Block caving
  • Sub-level caving


Summary:

Steady state production from Block 5 SLC to be reached in H2 FY 2020.

Block 5 SLC production commenced from first tunnels on 70L – FY 2016.

Production on 75L commenced in Q3 FY 2018; all tunnels in production in Q3 FY 2019.

Construction of ground handling infrastructure completed in Q1 FY 2019.

Block 5 SLC ramp up:
– FY 2017 – 0.8 Mt
– FY 2018 – 1.7 Mt
– FY 2019 – 2.5 Mt
– FY 2020 – 2.9 Mt EST
– H1 FY 2020 – 1.5 Mt
– H1 FY 2020 ROM grade of 57.4 cpht in line with guidance of 54 – 57 cpht.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher 1
Jaw crusher 1
High Pressure Grinding Roll crusher


Processing

  • Dense media separation
  • X-Ray sorting

Flow Sheet: Subscription required

Summary:

Density (Dense medium separation)
• Diamond - SG = 3.52
• Kimberlite - SG = 2.65

-Hydrophobic and oleophyllic (grease recovery)

-Colour (transparent – optical sorting) Shape (shape sorting)

-Non-magnetic (magnetic separation)

-Fluorescence (X-Ray recovery)

Recoveries & Grades:

CommodityParameter202020192018201720162015
Diamond Head Grade, carats/t 0.590.560.620.570.440.43

Production:

CommodityUnits202020192018201720162015
Diamond carats  ......  Subscription required  ......  Subscription required  ......  Subscription required2,149,8962,214,0642,065,875
All production numbers are expressed as mineral.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required5,843,716 t5,672,856 t
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Resource bottom cut-off: 1.0mm
Reserve bottom cut-off: 1.0mm

CategoryTonnage CommodityGradeContained carats
Probable 33.2 Mt Diamond 0.557 carats/t 18.48 M carats
Indicated 29.2 Mt Diamond 0.677 carats/t 19.78 M carats
Inferred 36.2 Mt Diamond 0.534 carats/t 19.33 M carats
Total Resource 65.4 Mt Diamond 0.598 carats/t 39.11 M carats

Operating Costs:

Units202020192018201720162015
Total operating costs ($/t milled) ZAR 477388329253183164

Financials:

Units202020192018201720162015
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.1  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 88  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 185.4  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 18, 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

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Project Description 2012
Fact Sheet 2008
Project Description 2007
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Aerial view:

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