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Owned and operated by De Beers , the Venetia diamond mine is estimated to contain more than 102 million carats . Located in the province of Limpopo in South Africa , the site is both an open-pit and underground mine producing roughly 3.066 million carats of diamonds in 2012 . With deposits consisting of 12 kimberlite pipes , the Venetia mine is the largest diamond producing mine in South Africa .

Venetia diamond mine is estimated t 42 September 2014