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Zhu Hongren, chief engineer of the Ministry of Industry and Information Technology, holds up a picture of a "disorderly" rare-earths mine. China supplies more than 90 percent of those materials sold in the international market. Tuo Yannan / China Daily
China's recent steps to regulate the rare-earth industry are in line with World Trade Organization rules and are meant to protect the environment, the country's top industry regulator said on Wednesday.