ZCCM-IH launched action in Oct 2016 to sue First Quantum over claims that the company borrowed $2.3bn from copper mining subsidiary without informing them.
The company halted production of refined copper at its smelter at the Utah-based mine in October, following the death of a worker who was exposed to sulphur dioxide gases at the plant while removing debris from a boiler.
Production at the Queensland-based operation was halted in 2015 because of falling zinc prices. Since then, prices for the metal have more than doubled.
The approvals will allow the company to modify its original expansion plan, already permitted and now 44 pct complete, which seeks to add another mine level.
