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Reserves & Resources

We manage a world-class resource of over 300 million carats

Petra Diamonds manages one of the world’s largest diamond resources of over 300 million carats (“Mcts”).  This major resource implies that the potential mine lives of Petra’s core assets could be considerably longer than the current mine plans in place at each operation, or could support significantly higher production rates.

Gross Resources

As at 30 June 2017, the Group’s gross Diamond Resources (inclusive of Reserves) decreased 2% to 305.0 Mcts (30 June 2016: 312.2 Mcts) due to depletion by mining activity at all operations and Resource re-estimations at Finsch, Koffiefontein and Williamson.

Gross Reserves

The Group’s gross Diamond Reserves increased 7% to 51.1 Mcts (30 June 2016: 47.9 Mcts) due to an increase of Reserves at Cullinan and Finsch due to the inclusion of additional tonnages from the CC1E and the SLC Phase 2 respectively in the current mine plans to 2030.

Summary of Gross Reserves and Resources

The following table summarises the gross Reserves and Resources status of the combined Petra Group operations as at 30 June 2017.

Category Tonnes (millions) Grade (cpht) Contained Diamonds (Mcts)
Probable 103.8 49.3 51.13
Sub-total 103.8 49.3 51.13
Measured 0.2 263.9 0.60
Indicated 412.6 52.1 215.03
Inferred 1,453.6 6.1 89.34
Sub-total 1,866.5 16.3 304.97


Download the Company’s full 2017 Resource Statement

Key Facts

  • 305.0 Mcts Resource: largest outside the majors
  • 51.1 Mcts Reserves