(Reuters) -The Trump administration will auction off coal leases on federal lands in four U.S. states in the coming days, a key test of mining industry interest in its efforts to revive a sector in decline. The sales in Alabama, Montana, Utah and Wyoming will be the first since President Donald Trump’s administration rolled out measures to support the coal industry with increased access to federal lands and hundreds of millions of dollars for more coal-fired power plants. U.S. coal production dropped 40% ...