The attempted sale of Chemaf Resources Ltd. comes after the company’s ambitious expansion drive ran into financial trouble.

To comply with Indonesia's push to process concentrate locally into metal, Freeport is building the Manyar smelter which is due to be completed by May next year.

The process, expected to take 18 months, is a key part of of Cornish Metals’ efforts to reopen the South Crofty tin-copper mine.

Despite Tuesday’s sharp drop, Teck has still outperformed most of its rivals this year.

Wheaton has agreed to purchase 100% of the silver produced by the mine over the project life.

Since Monday, protests against the contract have led to clashes between protesters and the police and the closure of major roads.

Revenue for the major global copper producer during the July-to-September period rose 17%.