Hochschild Mining Plc on Wednesday raised its annual output target and forecast lower mining costs, as its Inmaculada mine in Peru produced higher grade ore.
The Aviles and La Coruna plants were two of the least productive due to intrinsic structural problems such as inefficient technology and high fixed costs.
The move comes two weeks after India's top court said ArcelorMittal's bid for Essar Steel would become valid only if the acquirer cleared outstanding debt of Uttam Galva Steels and KSS Petron.
Decision comes after the companies received Wednesday a preliminary geological assessment of the property, which shows Heritage contains several targets for modern alluvial diamond placer deposits.
State-owned miner Inalum said the $3.85 billion deal is still subject to the issue of environmental recommendations and a special mining permit (IUPK) by the Indonesian government.
The Rajo Inca project would convert the existing asset, which has been in operation since 1959 and is due to run out of ore in 2021, to an open pit mine from an underground one.