TOKYO -- Repeated operational problems at Sumitomo Metal Mining's nickel smelting site in the Philippines are threatening the company's reputation as a cost-competitive producer, with its tanking stock prices reflecting investor worries.
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Troubled Philippine nickel plant muddies Sumitomo Metal's outlook
Stock price plunges as Japanese miner misses out on boom
The Taganito HPAL Nickel processing center in the Philippines was beset by mechanical problems throughout fiscal 2018.
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