Zambia's Finance Ministry said on Sunday that it was open to dialogue with mining companies over the government's plans to increase mining taxes.

Africa's second-largest copper producer said late last month that it would introduce new mining duties and increase royalties to help bring down mounting debt.

Large miners such as First Quantum, Glencore and Vedanta Resources have often criticised the Zambian government over rising costs at their operations.

"We remain open to dialogue with mining companies that are willing to amicably discuss the transition to the new mining tax regime," a Finance Ministry statement quoted minister Margaret Mwanakatwe as saying.

The statement said a tax policy review committee would be appointed to deal with technical issues related to the tax changes and that the ministry had taken note of criticism by Zambia's Chamber of Mines.

The Chamber of Mines said this week that some companies had already scrapped expansion plans over the tax hikes and that the country's copper output could fall.

The tax increases are part of government efforts to trim the fiscal deficit to 6.5% of gross domestic product in 2019 from 7.4% this year.

Mining accounts for more than 70% of Zambia's foreign exchange earnings.

Concerns about Zambia's rising debt, alongside accusations of additional hidden borrowing and government corruption, have spooked investors and Western donors in recent months.

The International Monetary Fund has put on hold talk about an aid package due to Zambia's debts, which it describes as unsustainable. – Mining Weekly