(IDEX Online) - Lucara has recovered a 470-ct diamond from its Karowe mine, in Botswana.It's the tenth +100-ct stone, and the third +300-ct so far from the deposit this year.The Canadian miner describes it as a top light brown clivage diamond (pictured) - indicating the rough stone will need to be split before being processed further.The diamond, measuring 49x42x26mm, was recovered from direct milling of ore sourced from the EM/PK(S) unit of the mine's South Lobe.Lucara announced in January that it will be operating Karowe for another 25 years after the government extended its mining license.The move will allow it to pursue an underground expansion program costing more than $500m, with the first ore anticipated from underground in 2026. Pic courtesy Lucara