Asset overview

Petra currently operates seven producing diamond mines.

Petra Diamonds South African assets
Koffiefontein mine, South Africa


Cullinan mine:

  • The world’s most celebrated diamond mine
  • Source of large, high-quality gem diamonds (Type IIs), including the ‘Cullinan’ (world’s largest at 3,106 carats)
  • Only reliable source of very rare and valuable blue diamonds
  • Underground kimberlite pipe mine currently at depth of 747 metres
  • World’s second largest indicated diamond resource of 181.4 million carats (total resource base of 203.3 million carats including tailings)
  • FY2010 production: 927,931 carats
  • Expansion plan to increase production to 2.4 million carats pa by 2019
  • Ownership: 74% Petra, 26% BEE partners (14% Thembinkosi Mining Investments (Pty) Ltd, 12% Petra Diamonds Employee Trust)

Koffiefontein mine:

  • A high average value per carat mine
  • Produces exceptional white and coloured diamonds, particularly pinks
  • Underground kimberlite pipe mine currently at depth of 490 metres
  • Resource of 5.7 million carats
  • FY2010 production: 60,260 carats
  • Expansion plan to increase production to 117,000 carats pa by 2017
  • Ownership: 70% Petra; 30% BEE partner Re-Teng Diamonds (Pty) Limited

Kimberly Underground mines:

  • Asset comprises three kimberlite pipes in close proximity: Bultfontein, Dutoitspan and Wesselton
  • Historic source of large diamonds and fancy yellows
  • Underground kimberlite mines between 845 and 995 metres deep
  • Resource of 7.5 million carats
  • FY2010 production: 1,362 carats (acquisition only completed May 2010)
  • Production plan of 100,000 carats for FY2011, rising to 180,000 carats pa thereafter
  • Ownership: 74% Petra; 26% BEE partner Sedibeng Mining (Pty) Limited

Fissure mines:

  • Asset portfolio comprises three mines: Helam, Sedibeng and Star
  • Petra is world leader in specialist underground kimberlite fissure mining
  • Underground fissure mines between 600 and 750 metres deep
  • Resource of 4.7 million carats
  • FY2010 production: 74,232 carats
  • Expansion plan to increase production to 120,000 carats pa
  • Ownership: 74.5% interest held in Sedibeng (BEE partners Sedibeng Mining (Pty) Limited and Bokone Properties (Pty) Limited); 74% interest held in Star (BEE partner Sedibeng Mining (Pty) Limited); 100% interest held in Helam

Petra Diamonds Tanzaninan assets


Williamson mine:

  • World’s largest economic kimberlite by surface area at 146 hectares in size
  • Historic source of high value Type II diamonds and fancy pinks
  • Opencast operation at 90 metres (deepest point)
  • Major resource of 40.0 million carats
  • FY2010 production: 101,071 carats (as part of final bulk sampling operation)
  • Expansion plan to increase production to 600,000 carats pa by FY2012
  • Ownership: 75% Petra; 25% partner the Government of the United Republic of Tanzania