In a fiery session at the Future Minerals Forum, Alcoa CEO William Oplinger dropped a warning about what he forecasts could be dire consequences of former US President Donald Trump’s proposed tariffs on minerals, just days before he returns for a second term.For all the latest headlines follow our Google News channel online or via the app.The forum, the largest of its kind, held in Riyadh, Saudi Arabia, unfolded against a backdrop of geopolitical instability. The president-elect is threatening hiking tariffs on major mineral producers like Mexico and Canada, and has even floated the idea of forced acquisitions of resource-rich territories such as Canada and Greenland amid a burgeoning trade war with Beijing, which controls approximately 70 percent of the rare earth minerals crucial for electronics and other high-tech applications.“The existing 10 percent tariff on aluminum has already disrupted trade flows,” Oplinger stated emphatically during the discussion moderated by Al Arabiya