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Reserves & Resources

We manage a world-class resource of ca. 230 million carats

Petra Diamonds Limited (“Petra” or the “Company” or the “Group”) manages one of the world’s largest diamond Resources of ca. 230 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 higher production rates.

Gross Resources

As at 30 June 2021 the Group’s gross diamond resources (inclusive of reserves) decreased 5% to 230.64 Mcts (30 June 2020: 243.51 Mcts), predominantly due to depletions at all mining assets further to ore mined in FY 2021 and the sale of Petra’s exploration assets in Botswana to Botswana Diamonds PLC, which has removed the KX36 kimberlite pipe (Resource of 8.73 Mcts) from the Resource Statement.

Gross Reserves

The Group’s gross diamond reserves decreased 14% to 33.33 Mcts (30 June 2020: 38.86 Mcts) in FY 2021, primarily due to mining depletions, the impact of increased pit scaling and waste ingress on the remaining reserves in the current SLC at Finsch, changes to the mine plan and mining method for the future block at Finsch, and Williamson remaining on care and maintenance.


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 2021.

Category Tonnes (millions) Grade (cpht) Contained Diamonds (Mcts)
Probable 116.3 28.7 33.33
Sub-total 116.3 28.7 33.33
Indicated 329.1 47.2 155.38
Inferred 1,292.3 5.8 75.27
Sub-total 1,621.3 14.2 230.64


Download the Company’s 2021 Resource Statement

Key Facts

  • ca. 230 Mcts Resource: largest outside the majors
  • 33.33 Mcts Reserves