Santiago/Melbourne — Workers at BHP Billiton’s Escondida copper mine in Chile have voted against the company’s latest wage offer, opening the door for a strike and potentially heralding a wave of stoppages at global suppliers after a rally. Prices rose to more than $6,000 a tonne in London. About 99% of members voted in favour of a strike that could start on Monday, according to a statement from Union Number 1.. Its 2,492 members represent about 95% of Escondida’s workers. The project is the world’s largest copper mine and is forecast to produce about 1.1-million tonnes in the 12 months to June 30, according to BHP. Copper has surged to the highest since 2015 as demand recovered and investors anticipated higher infrastructure spending from Donald Trump’s new administration. Citigroup has warned of the increased risk of strikes in 2017, as workers seek pay rises, with almost a fifth of global mine capacity facing contract renewals. While there was still time for an 11th-hour agreemen...

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