(Bloomberg) -- China's rare earths producers surged on Monday, after the government fleshed out plans for stricter controls on an industry that has played a crucial role in the country's trade war with the US.

Authorities are pushing for a system to better track all domestic supply, including a requirement to send regular output data to the government, according to a statement Friday on the website of the Ministry of Industry and Information Technology. Tighter regulations on rare earths output have tended to benefit bigger, established players.

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Among the top movers was magnet supplier JL-Mag Rare-Earth Co., which climbed as much as 18% in Hong Kong. On the mainland, China Northern Rare Earth Group High-Tech Co. added as much as 10%, while China Rare Earth Resources and Technology Co. gained 8.5% and Zhejiang Zhongke Magnetic Industry Co. rose 12%

The push for even more official scrutiny on rare earths comes after China placed most exports of the critical materials under heavier supervision as part of its tough stance against President Donald Trump's trade offensive. The rare earths industry is already highly regulated and state-dominated, although Beijing has also launched a campaign against smuggling in an attempt to control exports.

The plan announced on Friday was based on proposals first released in June 2024. It clarifies responsibilities of different bodies -- companies, local governments, ministries -- in managing output and monitoring any infringements.