Zambia will fine and break ties with mining firms that fail to operate according to the southern African country's laws, President Edgar Lungu said on Thursday.
The European Commission is currently reviewing its "safeguard" measures designed to limit incoming steel and prevent a surge of imports as a result of Washington's 25% import tariffs.
Freeport agreed to build a copper smelter in Indonesia within five years of closing a deal last December with the Indonesian government on the operatorship of the giant Grasberg copper mine.
The company's proposed production facility at Kwinana, near Perth in Western Australia, would manufacture battery graphite worth $72 million a year for export.