Rio Tinto and Glencore GLEN -1.46%decrease; red down pointing triangle are in talks about a deal that could create the world’s largest mining company with a market value of more than $200 billion, as a scramble for copper and other metals drives an industry return to big acquisitions.

Glencore and Rio Tinto separately confirmed that talks are under way over an all-share deal, revisiting a tie-up that was first discussed around a year ago when the U.S. and other countries began reshaping supply chains for metals and minerals essential to industries such as defense, automaking and semiconductor chips.

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