Minsur plans to track about 29,000 metric tons of tin a year, including its production in Brazil.

The update showed a significant inferred mineral resource of 1.4 billion tonnes at a copper-equivalent grade of 0.67%.

Profitability has become a problem for zinc producers in Europe facing sliding prices and rising production costs.

The updated PEA gives Gabbs an after-tax net present value with a 5% discount of $292.2 million and an internal rate of return of 17%.

The study, released Friday, drew mixed reactions from experts, mainly due to increased operating costs and cautious permitting approaches.

New bank lending in China beat expectations by nearly quadrupling in August from July as the central bank sought to shore up economic growth.

The long-awaited Udokan project in Russia's far east is coming on stream at a challenging time.