Jan 3 (Reuters) - The Biden administration on Friday issued the final mining permit for Perpetua Resources' (PPTA.O), opens new tab Idaho antimony and gold project, a move aimed at spurring U.S. production of a critical mineral at the center of a widening trade war between Washington and Beijing. Permitting for the mine, backed by billionaire investor John Paulson, comes after Beijing last month blocked exports to the U.S. of antimony,... Perpetua's mine will supply more than 35% of America's annual antimony needs once it opens by 2028 and produce 450,000 ounces of gold each year,...The project has not won...