TOKYO -- Prices for rare-earth metals are declining as new mining is slated to start in Australia and elsewhere, spurring oversupply concerns and chipping away at China's dominance of elements that are vital to the production of high-tech items from smartphones to electric cars and military hardware.
Neodymium, used for magnets in automobile and energy-saving home appliance motors, tumbled to a nine-month low this month, while dysprosium -- also used in auto motor magnets -- slid to its lowest in 19 months.
