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South Africa
Cullinan Mine

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 Location:
25 km E from Pretoria, South Africa

  Address:
Diamond Hub, Cullinan Diamond Mine, Cullinan
Pretoria
South Africa
1000
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  • Overview
  • Owners
  • Geology
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Diamond
Mining Method
  • Block caving
Processing
  • Dense media separation
  • X-Ray sorting
Mine Life2030
Cullinan is renowned as a source of large, high quality gem diamonds, including Type II stones, as well as being the world’s most important source of very rare blue diamonds.


Owners

Source: p. 126
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:

The pipe intruded rocks of the Transvaal Supergroup as well as igneous rocks of the Bushveld Igneous Complex. The kimberlite has been radiometrically dated at 1179 ± 36 Ma using Rb–Sr in clinopyroxene and 1202 ± 72 Ma using U–Pb in perovskite. The pipe is itself intruded by a gabbro sill of 1150 Ma.

The internal geology of the pipe was first described by Wagner who noted the presence of a “floating reef” of Waterberg quartzite which occurred in the middle of the pipe and was associated with a considerable rubble zone of rounded quartzite and sandstone boulders. These Waterberg quartzite inclusions indicated the presence of this formation at the time of emplacement, but which has since been eroded from the area. Later geological work identified the presence of a number of discrete kimberlite varieties that included two major types of TKB, named the “Brown” and “Grey” kimberlites. The large floating reef referred to above occurred within the Grey Kimberlite along the boundary with the Brown. In addition, a central complex that consisted of several phases of kimberlite occurred within the Grey. This was referred to as the Black Kimberlite, which has an associated variety called the Piebald Kimberlite. The last phase of magmatism was the intrusion of carbonate-rich dykes.


Mining Methods

  • Block caving


Summary:


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

Summary:

The new plant utilises gentler processing methods (comminution via attrition) instead of extensive crushing in the form of autogenous milling and high pressure grinding rolls, which are expected to reduce diamond breakage and improve recoveries across the full spectrum of diamonds, including the larger/exceptional stones for which the mine is rewnowned (the top-cut of 75mm will cater for diamonds of +3,000 carats, such as the Cullinan diamond).


Processing

  • Dense media separation
  • X-Ray sorting

Flow Sheet: Subscription required

Summary:

In September 2017, Petra completed the construction and commissioning of a modern, fit-for-purpose processing plant at Cullinan, with a throughput capacity of 6 Mtpa.

This has replaced the previous plant at Cullinan, which was originally commissioned in 1947 and which had undergone numerous refurbishments over the years. Due to its age and operational complexity, it had become expensive to maintain, requiring significant stay-in-business capex, and costly to operate, particularly given the large size of its 26 ha footprint. The plant was also based on old crushing technology, which is known to impact large stone recoveries as while diamond is the hardest substance known to man, it cannot take impact and therefore very large stones can be shattered using conventional processing techniques. At the same time, the energy efficiency of the old plant was not aligned with the Company’s vision.

The design of the new plant was therefore planned to address these shortc ........

Recoveries & Grades:

CommodityParameter202020192018201720162015
Diamond Head Grade, carats/t 0.370.390.360.360.280.24

Production:

CommodityUnits202020192018201720162015
Diamond carats  ......  Subscription required  ......  Subscription required  ......  Subscription required786,509680,813729,496
All production numbers are expressed as mineral.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required3,189,181 t4,971,310 t
Annual processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required6 Mt
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 43 Mt Diamond 0.385 carats/t 16.55 M carats
Indicated 228.6 Mt Diamond 0.592 carats/t 135.31 M carats
Inferred 169.6 Mt Diamond 0.101 carats/t 17.2 M carats
Total Resource 398.2 Mt Diamond 0.383 carats/t 152.5 M carats

Operating Costs:

Units202020192018201720162015
Total operating costs ($/t milled) ZAR 270234239316257154

Financials:

Units202020192018201720162015
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 8.8  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 121.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 122.2  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 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 2018
................................... Subscription required 2018
Annual Report 2017
Sustainability Report 2017
Annual Report 2016
Corporate Presentation 2016
Project Description 2016
Project Description 2008
Subscription required - Subscription is required.

Aerial view:

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