The United States is the world's largest consumer of uranium,with recent figures showing it imported 93 per cent of the uranium it used.
The release of the statement of reasons for then-environment minister Melissa Price's approval of the Yeelirrie uranium mine has sparked calls for an overhaul of Australia's environment laws.
The higher enrichment levels narrows the one-year window experts believe Iran would need to have enough material to build a nuclear weapon.
The move appears aimed at pressuring Europeans to circumvent US sanctions.