Silver bars are stacked in the safe deposit boxes room of the Pro Aurum gold house in Munich, Germany, January 10, 2025. Angelika Warmuth | ReutersBEIJING — China is set to tighten controls on silver exports from Thursday, expanding restrictions on the once-ordinary metal critical to the U.S. industry and defense supply chains.Tesla CEO Elon Musk criticized the move over the weekend on his social media platform X, responding to a post about the upcoming restrictions. "This is not good. Silver is needed in m ...