illustrations of mines showing the various mining techniques used to recover rough diamonds.
Rough Diamond Auctions: Sweeping Changes In Pricing and Distribution | Gems & Gemology
Letseng mine, Losotho. Gem Diamonds, which owns a 70% stake in the mine and markets all of its production, began selling all of its ~100,000ct annual production by tender auction after restarting operations in 2006.
February 27 Field Trip: Catoca diamond mine
Catoca pit, Angola. Angola's largest mine produced 6.5 million carats 2012 from 10 million metric tons of ore, generating revenue of $575 million Catoca is owned by Angola’s state-owned diamond company Endiama which holds a 32.8 %. Alrosa of Russia also has 32.8 %, a venture between China and state oil producer Sonangol owns 18% and Odebrecht SA of Brazil has 16.4%.