London — Glencore reduced the role of its billionaire head of copper, Aristotelis Mistakidis, shaking up the business after a review in the Democratic Republic of Congo raised questions about accounting and management. Mistakidis, one of Glencore’s largest shareholders and a key lieutenant of CEO Ivan Glasenberg for more than a decade, will lose control of industrial copper operations including mines, and focus on the trading side of the business, according to people familiar with the plans. Responsibility for Glencore’s copper assets will move to Mike Ciricillo, who now oversees copper smelting and refining, the people said, declining to be identified as the appointment is not yet public. The shake-up reduces Mistakidis’s responsibilities after he and two other executives resigned from the board of Glencore’s Katanga Mining in Congo in November. A review by Katanga led to a restatement of its financial reporting, and a commitment from Glencore to restructure the management of its o...

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