In March, the WTO dispute settlement panel found that China's restrictions breach WTO rules. Its ruling followed complaints by the United States, the European Union and Japan.
The Geneva-based WTO's appellate panel today rejected Beijing's appeal, saying it hasn't "demonstrated that the export quotas that China applies to various forms of rare earths ... Are justified."
China accounts for more than 90 per cent of production of rare earth minerals. In 2009, it alarmed foreign companies by limiting rare earth exports in an attempt to boost its domestic manufacturing base.