Copper output in Congo, Africa's top producer of the metal, rose 15 percent year-on-year in the first half of 2017 to more than half a million tonnes, and cobalt production surged 27 percent to almost 40,000 tonnes, the central bank said.
The miner, Africa's biggest gold producer, reported a loss of $176 million in the six months to June 30, compared to a profit of $52 million in the same period last year.
Should the spinoff happen, AngloGold would be the latest miner to reduce exposure to South Africa, where political instability, controversial new mining rules and a stronger rand have made it less attractive to operate.
The country's Reserve Bank has ordered platinum and chrome miners to surrender 80 percent of their export earnings to the central bank as the country struggles to contain a crippling dollar note shortage.
South African miner Harmony Gold reported a 35 percent rise in full-year profit on Thursday and said it will look at growth, exploration and acquisitions to meet its 2019 production targets.