Group production for MMG in the September quarter was 121,926 tonnes of copper and 57,595t of zinc.

MMG's 2018 production guidance for Dugald River has been upgraded to 140,000-150,000t of zinc in concentrate, from 120,000-140,000t previously.

"The Dugald River ramp up continues to track ahead of schedule, with mining and milling rates at 100% and 112% of nameplate capacity during the third quarter," MMG CEO Geoffrey Gao said.

Las Bambas mining and production rates are recovering following the localised wall slippage that impacted September quarter production.

MMG downgraded 2018 guidance for Las Bambas last month to 375,000-395,000t from 410,000-430,000t.

C1 cost guidance was lifted to US$1.10-1.20 per pound from $1-1.10/lb.

"Despite the geotechnical challenges during the quarter, mill throughput increased 7% compared to first half 2018 rates with throughput now consistently running above design capacity," Gao said.

"Las Bambas is expected to produce in excess of two million tonnes of copper in concentrate over its first five years of operation and we continue to advance a series of debottlenecking, plant upgrade and exploration projects to extend this production profile into the future."

Rosebery and Kinsevere both delivered record quarters for mill throughput as the company continued to drive operational improvements and advance programs to extend mine lives.

During the quarter, the Democratic Republic of the Congo's (DRC) Government has commenced enforcement of elements of the 2018 Mining Code, including increased royalty rates, import duties and environmental taxes.

As previously flagged, MMG made a formal request for negotiation with the Democratic Republic of Congo government under the Bilateral Investment Treaty between the DRC and China with regards to the country's new mining code.

MMG's 2018 guidance is 455,000-475,000t of copper and 210,000-230,000t of zinc.

Shares in the company remained untraded on the ASX at A$5.