Even if a trade agreement is reached soon, analysts say it would be no panacea for China's economy, which is expected to continue decelerating in coming months.
China launched the crackdown on the rare earth sector in 2009, with authorities claiming that illegal activities drove down global prices and made it impossible to cover the huge environmental costs of production.
With metals ringing off the new year on a weak note, both price- and demand-wise, BMO Metals says the main questions for 2019 revolve around China and whether its government is doing enough to slow the country's economic contraction.
The founder of the US private security company aims to raise as much as $500 million to invest in deposits of metals such as cobalt, lithium and copper.