China calls on other countries to develop their own rare earth resources

The United States is working to develop its own domestic rare-earth supply. A company called Molycorp has plans to begin rare-earth mining at a site in California next year.

Jiang also said China is not violating World Trade Organization rules in reducing its rare-earth export quotas. The spokeswoman stressed that China will continue to export rare earths.

"This accords with relevant WTO rules. In the future, China will continue to supply rare earths to the international market and will take effective management steps over their export in accordance with WTO rules," she said, according to Reuters.