Revenue at Lucapa Diamond Corp. slumped in the third quarter as the miner held back seven large stones to sell at a tender earlier this month. Group sales slid 43% year on year to $14.6 million for the period, Lucapa reported last week. Sales volume dropped 24% to 15,493 carats, with production down 20% at 16,588 carats. The slowdown reflected lower sales and output from the Lulo mine in Angola, where revenue plummeted 56% to
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