The case is " in the WTO Dispute Panel hearing stage, and according to WTO rules, the panel's hearings are not disclosed," said the ministry statement. "Any leak of the report circulated to the members before the panel hearing would be suspected of violating WTO rules," it said.
Rare earths are 17 minerals used to make goods including hybrid cars, weapons, flat-screen TVs, mobile phones, mercury-vapor lights and camera lenses.
Beijing also has tightened control over its rare earths industry by pushing companies to merge into state-owned groups and forcing smaller producers to close.
The trade restrictions are especially sensitive at a time when governments are trying to boost exports to reduce high unemployment. The United States and Europe are looking to increase sales of high-tech goods that include products made with rare earths.
"China has repeatedly stressed that China policy objective is to protect resources and the environment and achieve sustainable development and that it has no intention of protecting domestic industries in a way that distorts trade," the commerce ministry statement said.
Beijing's export curbs pushed up rare earths prices on global markets. That prompted foreign producers to announce plans to reopen or develop mines in California, Canada, India, Russia and elsewhere.
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Chinese Ministry of Commerce: www.mofcom.gov.cn