Several global metals producers have also set their sights on Indonesia's nickel reserves, looking to tap an expected surge in demand for the battery metal.
Delivering a $7.1 billion budget in parliament, Margaret Mwanakatwe pledged to bring debt down and to trim the fiscal deficit to 6.5 percent of GDP in 2019.
The state miner warned it would "assert its rights" in Barrick Gold's acquisition of Rangold's stake in the Kibali mine, but did not provide details of its plans.