The Russian company, hit by a sustained slowdown in the diamond market, said its rough diamond have declined by 6% in the first six months of the year.
The Chamber of Mines wants the government to reconsider its decision to hike corporate income tax rate on mineral processing from 30% to 35%, which came in effect July 1.
New data by International Copper Study Group predicts copper mine output will grow 5.7 million tonnes by 2018 as Peru, Zambia and Mexico ramp up production.