Swiss giant GlencoreXstrata said its copper production spiked 20 per cent in the first half of the year ahead of its first-half earnings, which it will publish next week.
The surge was due to accelerated projects in Australia, Peru and Africa, the AFR reported.
Copper production until June 30 this year stood at 673,400 tonnes, with African production increasing by 42 per cent to 171,500 tonnes and contributing substantially to the production jump.
The Katanga and Mutanda mines in the Democratic Republic of Congo contributed heavily to production.
The company also said better operational performance had led to a spike in gold production, with a 22.6 per cent growth to stand at 777,000 tonnes.
But zinc production slipped by three per cent, according to news.com.au, as production fell in North America. Production in Australian and Nambian mines were not able to compensate for it.
The company reported earlier this year zinc production from its Australian operations jumped by 11 per cent from 2012 in its IMS & First Quarter 2013 Production Report.
The merged company abandoned a coal export terminal on Balaclava Island, due to poor market conditions. It was the first project to be dumped following the merger.