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Petra Diamonds booked a deeper full-year loss after it wrote down the value of its assets.
Net losses for the six months through June amounted to $258.1m, compared to losses of $203.1m on-year, and included non-cash impairment charge of $246.6m.
Revenue fell 6% to $463.6m, even as production edged up to 3.87m carats, up from 3.84m carats on-year.
The company said it was on track to achieve its 2020 financial year production guidance of around 3.8m carats.