In August, BHP had shut an acid plant following a boiler tube failure, disrupting copper processing. Underground mining at the site continued as normal.
Aristotelis Mistakidis, the man who built Glencore’s reputation in copper, is under intense pressure after a string of investigations, problems and legal headaches.
Away from the seminars and cocktail parties, metal producers, traders and users will meet behind closed doors to hammer out details of next year's contracts.