The 2011 rough diamond sales agreement in which the venture sells 75% of its output to De Beers was set to expire in 2020, but was extended for a year till last December and then again for six more months.
The Anglo American unit said in a statement that the parties had agreed to the one-year extension to enable the finalisation of discussions towards a new agreement.
Diamond sales account for a large share of Botswana's foreign currency earnings.
The extension of the agreement for the sale of Debswana's diamond output runs until 30 June 2023.
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