Sierra Leone: Reprocessing of Tongo Sample Tailings Results in 29% Grade Increase

Jul 15, 2014 | Leandi Kolver, Mining Weekly
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JOHANNESBURG (miningweekly.com) – The reprocessing of bulk sample tailings at West Africa-focused diamond developer Stellar Diamonds’ Tongo kimberlite dyke project, in Sierra Leone, has yielded additional diamonds and increased the average grade by 29%, the company announced on Tuesday.

The undiluted diamond grade had increased from 120 carats per hundred tonnes (cpht) to 155 cpht, with the resource size currently being independently estimated at 1.1-million carats, with the potential to increase further.