Two New Mexico Democrats today introduced a bill that would require uranium mining companies to pay a 12.5-percent royalty on federal lands – a move Sen. Mark Udall of Colorado at least favors studying given the growing interest in uranium mining and nuclear power. The Uranium Resources Stewardship Act introduced by U.S. Reps. Martin Heinrich and Ben Ray Luján would shift the regulation of uranium mining from the 1872 Mining Law to the Mineral Leasing Act and require royalty payments to federal and state governments similar to those paid by the coal, oil and gas industries.